10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2017

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from                    to

Commission File Number 001-33378

DISCOVER FINANCIAL SERVICES

(Exact name of registrant as specified in its charter)

Delaware	36-2517428
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2500 Lake Cook Road, Riverwoods, Illinois 60015	(224) 405-0900
(Address of principal executive offices, including zip code)	(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  x    No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer  x	Accelerated filer  o
Non-accelerated filer  o (Do not check if a smaller reporting company)	Smaller reporting company  o
	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  o    No  x

As of July 28, 2017, there were 372,351,948 shares of the registrant’s Common Stock, par value $0.01 per share, outstanding.

DISCOVER FINANCIAL SERVICES

Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017

TABLE OF CONTENTS

Part I	FINANCIAL INFORMATION
Item 1.	Financial Statements	1
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	45
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	70
Item 4.	Controls and Procedures	71
Part II	OTHER INFORMATION
Item 1.	Legal Proceedings	72
Item 1A.	Risk Factors	72
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	72
Item 3.	Defaults Upon Senior Securities	72
Item 4.	Mine Safety Disclosures	72
Item 5.	Other Information	72
Item 6.	Exhibits	72

Except as otherwise indicated or unless the context otherwise requires, “Discover Financial Services,” “Discover,” “DFS,” “we,” “us,” “our,” and “the Company” refer to Discover Financial Services and its subsidiaries.

We own or have rights to use the trademarks, trade names and service marks that we use in conjunction with the operation of our business, including, but not limited to: Discover^®, PULSE^®, Cashback Bonus^®, Discover Cashback Checking^®, Discover it^®, Freeze It^SM, Discover^® Network and Diners Club International^®. All other trademarks, trade names and service marks included in this quarterly report on Form 10-Q are the property of their respective owners.

Part I. FINANCIAL INFORMATION

Item 1. Financial Statements

DISCOVER FINANCIAL SERVICES

Condensed Consolidated Statements of Financial Condition

	June 30, 2017			December 31, 2016
	(unaudited) (dollars in millions, except share amounts)
Assets
Cash and cash equivalents	$	12,950		$	11,914
Restricted cash	93			95
Investment securities (includes $1,499 and $1,605 at fair value at June 30, 2017 and December 31, 2016, respectively)	1,679			1,757
Loan receivables
Loan receivables	77,997			77,254
Allowance for loan losses	(2,384		)	(2,167		)
Net loan receivables	75,613			75,087
Premises and equipment, net	774			734
Goodwill	255			255
Intangible assets, net	164			166
Other assets	2,229			2,300
Total assets	$	93,757		$	92,308
Liabilities and Stockholders’ Equity
Deposits
Interest-bearing deposit accounts	$	52,359		$	51,461
Non-interest bearing deposit accounts	505			531
Total deposits	52,864			51,992
Long-term borrowings	26,438			25,443
Accrued expenses and other liabilities	3,196			3,550
Total liabilities	82,498			80,985
Commitments, contingencies and guarantees (Notes 8, 11 and 12)
Stockholders’ Equity:
Common stock, par value $0.01 per share; 2,000,000,000 shares authorized; 563,441,961 and 562,414,040 shares issued at June 30, 2017 and December 31, 2016, respectively	6			5
Preferred stock, par value $0.01 per share; 200,000,000 shares authorized; 575,000 shares issued and outstanding and aggregate liquidation preference of $575 at June 30, 2017 and December 31, 2016	560			560
Additional paid-in capital	3,997			3,962
Retained earnings	15,989			15,130
Accumulated other comprehensive loss	(150		)	(161		)
Treasury stock, at cost; 188,278,530 and 173,648,023 shares at June 30, 2017 and December 31, 2016, respectively	(9,143		)	(8,173		)
Total stockholders’ equity	11,259			11,323
Total liabilities and stockholders’ equity	$	93,757		$	92,308

The table below presents the carrying amounts of certain assets and liabilities of Discover Financial Services’ consolidated variable interest entities ("VIEs"), which are included in the condensed consolidated statements of financial condition above. The assets in the table below include those assets that can only be used to settle obligations of the consolidated VIEs. The liabilities in the table below include third-party liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. The liabilities also exclude amounts for which creditors have recourse to the general credit of Discover Financial Services.

	June 30, 2017			December 31, 2016
	(unaudited) (dollars in millions)
Assets
Restricted cash	$	93		$	95
Loan receivables	$	31,356		$	33,016
Allowance for loan losses allocated to securitized loan receivables	$	(995	)	$	(955	)
Other assets	$	5		$	4
Liabilities
Long-term borrowings	$	16,738		$	16,411
Accrued expenses and other liabilities	$	15		$	15

See Notes to the Condensed Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Condensed Consolidated Statements of Income

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
	(unaudited) (dollars in millions, except per share amounts)
Interest income
Credit card loans	$	1,916	$	1,734	$	3,792	$	3,467
Other loans	379		331		746		657
Investment securities	7		10		14		21
Other interest income	36		15		64		29
Total interest income	2,338		2,090		4,616		4,174
Interest expense
Deposits	199		166		390		328
Long-term borrowings	201		173		396		345
Total interest expense	400		339		786		673
Net interest income	1,938		1,751		3,830		3,501
Provision for loan losses	640		412		1,226		836
Net interest income after provision for loan losses	1,298		1,339		2,604		2,665
Other income
Discount and interchange revenue, net	278		265		511		538
Protection products revenue	56		59		114		120
Loan fee income	83		79		172		159
Transaction processing revenue	42		39		81		75
Other income	22		23		50		47
Total other income	481		465		928		939
Other expense
Employee compensation and benefits	367		340		730		685
Marketing and business development	192		198		360		360
Information processing and communications	77		89		157		177
Professional fees	156		150		303		310
Premises and equipment	23		23		48		47
Other expense	97		106		199		213
Total other expense	912		906		1,797		1,792
Income before income tax expense	867		898		1,735		1,812
Income tax expense	321		282		625		621
Net income	$	546	$	616	$	1,110	$	1,191
Net income allocated to common stockholders	$	532	$	602	$	1,083	$	1,164
Basic earnings per common share	$	1.41	$	1.47	$	2.83	$	2.81
Diluted earnings per common share	$	1.40	$	1.47	$	2.83	$	2.81
Dividends declared per common share	$	0.30	$	0.30	$	0.60	$	0.58

See Notes to the Condensed Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Condensed Consolidated Statements of Comprehensive Income

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
	2017		2016			2017		2016
	(unaudited) (dollars in millions)
Net income	$	546	$	616		$	1,110	$	1,191
Other comprehensive income (loss), net of taxes
Unrealized gain on available-for-sale investment securities, net of tax	—		4			1		18
Unrealizedgain (loss) on cash flow hedges, net of tax	5		(6		)	10		(32		)
Other comprehensive income (loss)	5		(2		)	11		(14		)
Comprehensive income	$	551	$	614		$	1,121	$	1,177

See Notes to the Condensed Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Condensed Consolidated Statements of Changes in Stockholders’ Equity

							Additional Paid-in Capital		Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock			Total Stockholders’ Equity
	Preferred Stock			Common Stock
	Shares	Amount		Shares	Amount
	(unaudited) (dollars in millions, shares in thousands)
Balance at December 31, 2015	575	$	560	560,679	$	5	$	3,885	$	13,250		$	(160	)	$	(6,265	)	$	11,275
Net income	—	—		—	—		—		1,191			—			—			1,191
Other comprehensive loss	—	—		—	—		—		—			(14		)	—			(14		)
Purchases of treasury stock	—	—		—	—		—		—			—			(849		)	(849		)
Common stock issued under employee benefit plans	—	—		45	—		2		—			—			—			2
Common stock issued and stock-based compensation expense	—	—		1,631	—		45		—			—			—			45
Dividends — common stock	—	—		—	—		—		(234		)	—			—			(234		)
Dividends — preferred stock	—	—		—	—		—		(19		)	—			—			(19		)
Balance at June 30, 2016	575	$	560	562,355	$	5	$	3,932	$	14,188		$	(174	)	$	(7,114	)	$	11,397
Balance at December 31, 2016	575	$	560	562,414	$	5	$	3,962	$	15,130		$	(161	)	$	(8,173	)	$	11,323
Net income	—	—		—	—		—		1,110			—			—			1,110
Other comprehensive income	—	—		—	—		—		—			11			—			11
Purchases of treasury stock	—	—		—	—		—		—			—			(970		)	(970		)
Common stock issued under employee benefit plans	—	—		40	—		3		—			—			—			3
Common stock issued and stock-based compensation expense	—	—		988	1		32		—			—			—			33
Dividends — common stock	—	—		—	—		—		(232		)	—			—			(232		)
Dividends — preferred stock	—	—		—	—		—		(19		)	—			—			(19		)
Balance at June 30, 2017	575	$	560	563,442	$	6	$	3,997	$	15,989		$	(150	)	$	(9,143	)	$	11,259

See Notes to the Condensed Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Condensed Consolidated Statements of Cash Flows

	For the Six Months Ended June 30,
	2017			2016
	(unaudited) (dollars in millions)
Cash flows from operating activities
Net income	$	1,110		$	1,191
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,226			836
Deferred income taxes	(46		)	121
Depreciation and amortization	188			176
Amortization of deferred revenues and accretion of accretable yield on acquired loans	(195		)	(198		)
Net loss investments and other assets	27			26
Other, net	33			39
Changes in assets and liabilities:
Decrease in other assets	3			89
Decrease in accrued expenses and other liabilities	(314		)	(464		)
Net cash provided by operating activities	2,032			1,816
Cash flows from investing activities
Purchases of other short-term investments	—			(1,050		)
Maturities of available-for-sale investment securities	104			671
Maturities of held-to-maturity investment securities	7			9
Purchases of held-to-maturity investment securities	(36		)	(46		)
Net principal disbursed on loans originated for investment	(1,550		)	(83		)
Proceeds from returns of investment	14			—
Purchases of other investments	(23		)	(12		)
Increase in restricted cash	2			1
Purchases of premises and equipment	(103		)	(86		)
Net cash used for investing activities	(1,585		)	(596		)
Cash flows from financing activities
Proceeds from issuance of securitized debt	2,952			1,833
Maturities and repayment of securitized debt	(2,651		)	(1,966		)
Proceeds from issuance of other long-term borrowings	1,050			73
Maturities and repayment of other long-term borrowings	(401		)	—
Proceeds from issuance of common stock	2			5
Purchases of treasury stock	(970		)	(849		)
Net increase in deposits	858			983
Dividends paid on common and preferred stock	(251		)	(254		)
Net cash provided by (used for) financing activities	589			(175		)
Net increase in cash and cash equivalents	1,036			1,045
Cash and cash equivalents, at beginning of period	11,914			9,572
Cash and cash equivalents, at end of period	$	12,950		$	10,617

See Notes to the Condensed Consolidated Financial Statements.

5

Notes to the Condensed Consolidated Financial Statements

(unaudited)

1.    Background and Basis of Presentation

Description of Business

Discover Financial Services (“DFS” or the “Company”) is a direct banking and payment services company. The Company is a bank holding company under the Bank Holding Company Act of 1956 as well as a financial holding company under the Gramm-Leach-Bliley Act and therefore is subject to oversight, regulation and examination by the Board of Governors of the Federal Reserve System (the “Federal Reserve”). The Company provides direct banking products and services and payment services through its subsidiaries. The Company offers its customers credit card loans, private student loans, personal loans, home equity loans and deposit products. The Company also operates the Discover Network, the PULSE network (“PULSE”) and Diners Club International (“Diners Club”). The Discover Network processes transactions for Discover-branded credit cards and provides payment transaction processing and settlement services. PULSE operates an electronic funds transfer network, providing financial institutions issuing debit cards on the PULSE network with access to ATMs domestically and internationally, as well as point-of-sale terminals at retail locations throughout the U.S. for debit card transactions. Diners Club is a global payments network of licensees, which are generally financial institutions, that issue Diners Club branded charge cards and/or provide card acceptance services.

The Company’s business segments are Direct Banking and Payment Services. The Direct Banking segment includes Discover-branded credit cards issued to individuals on the Discover Network and other consumer products and services, including private student loans, personal loans, home equity loans, and other consumer lending and deposit products. The majority of Direct Banking revenues relate to interest income earned on the segment's loan products. Additionally, the Company's credit card products generate substantially all revenues related to discount and interchange, protection products and loan fee income.

The Payment Services segment includes PULSE, an automated teller machine, debit and electronic funds transfer network; Diners Club, a global payments network; and the Company’s Network Partners business, which provides payment transaction processing and settlement services on the Discover Network. The majority of Payment Services revenues relate to transaction processing revenue from PULSE and royalty and licensee revenue from Diners Club.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, the financial statements reflect all adjustments which are necessary for a fair presentation of the results for the interim period. All such adjustments are of a normal, recurring nature. The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and related disclosures. These estimates are based on information available as of the date of the condensed consolidated financial statements. The Company believes that the estimates used in the preparation of the condensed consolidated financial statements are reasonable. Actual results could differ from these estimates. These interim condensed consolidated financial statements should be read in conjunction with the Company’s 2016 audited consolidated financial statements filed with the Company’s annual report on Form 10-K for the year ended December 31, 2016.

Recently Issued Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The purpose of this ASU is to simplify the test for goodwill impairment by eliminating Step 2 of the current impairment test. Under the current rules, if the reporting unit’s carrying value exceeds its fair value (Step 1), goodwill impairment is measured as the difference between the carrying value of goodwill and its implied fair value. To compute the implied fair value of goodwill under Step 2, an entity has to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Under the new standard, the Company will perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The Company should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value;

6

however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The amendments in this ASU apply to the Company’s annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The amendments in this ASU apply on a prospective basis. All of the Company’s recorded goodwill is associated with its PULSE debit business. This ASU has no impact on cash flows, and its adoption is not expected to have any impact on the Company’s financial condition or results of operations because the estimated fair value of the PULSE reporting unit is well in excess of its carrying value. The Company has not elected to early adopt this amendment.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Whereas restricted cash balances have traditionally been excluded from the statement of cash flows, this ASU requires restricted cash and restricted cash equivalents to be included within the beginning and ending totals of cash, cash equivalents and restricted cash presented on the statement of cash flows for all periods presented. Restricted cash and restricted cash equivalent inflows and outflows with external parties are required to be classified within the operating, investing, and/or financing activity sections of the statement of cash flows whereas transfers between cash and cash equivalents and restricted cash and restricted cash equivalents should no longer be presented on the statement of cash flows. ASU 2016-18 also requires the nature of the restrictions to be disclosed to help provide information about the sources and uses of these balances during a reporting period and a reconciliation of the cash, cash equivalents and restricted cash totals on the statement of cash flows to the related balance sheet line items when cash, cash equivalents, and restricted cash are presented in more than one line item on the balance sheet. The reconciliation can be presented either on the face of the statement of cash flows or in the notes to the financial statements and must be provided for each period that a balance sheet is presented. The ASU will become effective for the Company on January 1, 2018, with early adoption permitted, and is not expected to have a material impact to the Company’s statement of cash flows. The Company has not elected to early adopt this amendment.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU eliminates the incurred loss threshold for initial recognition of credit impairment in current GAAP and replaces it with the expected loss concept. For all loans carried at amortized cost, companies will be required to measure their allowance for loan losses based on management’s current estimate of all expected credit losses over the remaining contractual term of the assets. Because it eliminates the incurred loss trigger, the new accounting guidance will require companies, upon the origination of a loan, to record their estimate of all expected credit losses on that loan through an immediate charge to earnings. Updates to that estimate each period will be recorded through provision expense. The estimate of loan losses must be based on historical experience, current conditions and reasonable and supportable forecasts. The ASU does not mandate the use of any specific method for estimating credit loss, permitting companies to use judgment in selecting the approach that is most appropriate in their circumstances.

The new rules are expected to affect the Company’s allowance for loan losses as a result of: (1) the requirement to measure the allowance based on all losses expected to occur over the remaining life of the loans receivable rather than including only losses deemed to be related to a past event or current condition, and (2) the reclassification of the non-accretable credit adjustment, currently embedded in the Company’s purchased credit-impaired ("PCI") student loan portfolio, into the allowance for loan losses. The separate measurement guidance applicable today for loans modified in a troubled debt restructuring will also be affected. Both troubled debt restructurings and PCI assets, which the ASU refers to as purchased credit-deteriorated ("PCD") will still be subject to certain separate disclosure requirements. Measurement of credit impairment of available-for-sale debt securities will generally remain unchanged under the new rules, but any such impairment will be recorded through an allowance, rather than a direct write-down of the security.

The ASU will become effective for the Company on January 1, 2020, with early adoption permitted no sooner than January 1, 2019. Upon adoption, a cumulative effect adjustment to retained earnings will be recorded as of the beginning of the first reporting period in which the guidance is effective in an amount necessary to adjust the allowance for loan losses to equal the current estimate of expected losses on financial assets held at that date. Additionally, upon adoption, the carrying value of PCD loans will be increased through an offsetting addition to the allowance for loan losses for the amount of expected credit losses on those loans, to be re-evaluated in subsequent periods and adjusted through provision expense as needed, and any non-credit premium or discount will be amortized or accreted to interest income from that point forward over the remaining life of PCD loans. Management is evaluating the standard, initiating implementation efforts across the Company, and planning for loss modeling requirements consistent with lifetime expected loss estimates. The Company has also been involved in efforts to identify and resolve various implementation issues specific to the application of the standard to credit card receivables. Adoption of the standard could have a potentially material impact on how the Company records and reports its financial condition and results of operations, and on regulatory capital. The extent of the impact upon adoption

7

will likely depend on the characteristics of the Company's loan portfolio and economic conditions at that date, as well as forecasted conditions thereafter.

In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The guidance in this ASU provides clarification on the principal versus agent concept in relation to revenue recognition guidance issued as part of ASU 2014-09, Revenue from Contracts with Customers (Topic 606). Topic 606 requires a company to determine whether it is a principal or an agent in a transaction in which another party is involved in providing goods or services to a customer by evaluating the nature of its promise to the customer. ASU 2016-08 provides clarification for identifying the good, service or right being transferred in a revenue transaction and identifies the principal as the party that controls the good, service or right prior to its transfer to the customer. The ASU provides further clarity on how to evaluate control in this context. This guidance will become effective for the Company on January 1, 2018 and management is evaluating the impact of these changes as part of its overall evaluation of ASU 2014-09, discussed below. Based on its evaluations to date, management does not anticipate that this ASU will result in different conclusions regarding the Company's revenue arrangements that involve a principal-agent relationship, but any such changes that could occur would result only in classification differences on the statements of income with no impact on income before taxes, net income, financial condition or cash flows.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The guidance will require lessees to capitalize most leases on their balance sheet whereas under current GAAP only capital leases are recognized on the lessee’s balance sheet. Leases which today are identified as capital leases will generally be identified as financing leases under the new guidance but otherwise their accounting treatment will remain relatively unchanged. Leases identified today as operating leases will generally remain in that category under the new standard, but both a right-of-use asset and a liability for remaining lease payments will now be required to be recognized on the balance sheet for this type of lease. The manner in which expenses associated with all leases are reported on the income statement will remain mostly unchanged. Lessor accounting also remains substantially unchanged by the new standard. The new guidance will become effective for the Company on January 1, 2019, and management does not expect it to have a material impact on the condensed consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU will have limited impact on the Company since it does not change the guidance for classifying and measuring investments in debt securities or loans. The standard requires entities to measure certain cost-method equity investments at fair value with changes in value recognized in net income. Equity investments that do not have readily determinable fair values will be carried at cost, less any impairment, plus or minus changes resulting from any observable price changes in orderly transactions for an identical or similar investment of the same issuer. This ASU requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans) on the balance sheet or the accompanying notes to the financial statements. This ASU will become effective for the Company on January 1, 2018 and is not expected to have a material impact to the financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance in this ASU supersedes existing revenue recognition requirements in Topic 605, Revenue Recognition, including an assortment of transaction-specific and industry-specific rules. The new revenue recognition model will become effective for the Company on January 1, 2018.

This ASU establishes a principles-based model under which revenue from a contract is allocated to the distinct performance obligations within the contract and recognized in income as each performance obligation is satisfied. ASU Topic 606 does not apply to rights or obligations associated with financial instruments (for example, interest income from loans or investments, or interest expense on debt), and therefore the Company’s net interest income should not be affected. The Company’s revenue from discount and interchange, protection products, transaction processing and certain fees are within the scope of these rules. Management has followed the discussions of the FASB subsequent to the issuance of the ASU, and evaluated the conclusions published by its Transition Resource Group ("TRG"), specifically those pertaining to how the new revenue recognition rules should be interpreted for credit card arrangements, loyalty programs, and transaction processing arrangements. Those discussions support the conclusion that timing and measurement of fee revenues associated with the Company’s credit card arrangements and costs associated with the Company’s credit card reward programs will not be impacted by the new rules. The FASB TRG discussions and guidance also support the conclusion that the timing and measurement of revenue associated with the Company’s transaction processing services, including discount and interchange

8

and other transaction processing fees, will remain substantially unchanged under the new accounting model. This conclusion covers the vast majority of the Company’s revenue that is within the scope of the new standard.

Upon adoption in 2018, the Company will record an adjustment, if needed, to retained earnings as of the beginning of the year of initial application, which can be either the earliest comparative period presented, with all periods presented under the new rules, or January 1, 2018, without restating prior periods presented. While management continues to evaluate the remaining in-scope revenue items to determine what, if any, impact the rules will have on their accounting and reporting, no material impacts are expected. At this time, management does not anticipate a restatement of prior period amounts when the standard becomes effective.

Business Dispositions

On June 16, 2015, the Company announced the closing of the mortgage origination business it acquired in 2012, which was part of its Direct Banking segment. The disposition represented the exiting of an ancillary business and did not have a major impact on the Company’s operations.

2. Investments

The Company’s investment securities consist of the following (dollars in millions):
	June 30, 2017		December 31, 2016
U.S. Treasury securities(1)	$	672	$	674
States and political subdivisions of states	1		2
Residential mortgage-backed securities - Agency(2)	1,006		1,081
Total investment securities	$	1,679	$	1,757

(1) Includes $37 million and $73 million of U.S. Treasury securities pledged as swap collateral as of June 30, 2017 and December 31, 2016, respectively.

(2) Consists of residential mortgage-backed securities issued by Fannie Mae, Freddie Mac and Ginnie Mae.

The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale and held-to-maturity investment securities are as follows (dollars in millions):
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At June 30, 2017
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(4	)	$	672
Residential mortgage-backed securities - Agency	827		3		(3		)	827
Total available-for-sale investment securities	$	1,503	$	3	$	(7	)	$	1,499
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	1	$	—	$	—		$	1
Residential mortgage-backed securities - Agency(3)	179		1		(1		)	179
Total held-to-maturity investment securities	$	180	$	1	$	(1	)	$	180
At December 31, 2016
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(2	)	$	674
Residential mortgage-backed securities - Agency	934		2		(5		)	931
Total available-for-sale investment securities	$	1,610	$	2	$	(7	)	$	1,605
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	2	$	—	$	—		$	2
Residential mortgage-backed securities - Agency(3)	150		1		(1		)	150
Total held-to-maturity investment securities	$	152	$	1	$	(1	)	$	152

(1) Available-for-sale investment securities are reported at fair value.

(2) Held-to-maturity investment securities are reported at amortized cost.

(3) Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.

9

The following table provides information about investment securities with aggregate gross unrealized losses and the length of time that individual investment securities have been in a continuous unrealized loss position (dollars in millions):
	Number of Securities in a Loss Position	Less than 12 months					More than 12 months
		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At June 30, 2017
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	672	$	(4	)	$	—	$	—
Residential mortgage-backed securities - Agency	15	$	376	$	(2	)	$	46	$	(1	)
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	38	$	88	$	(1	)	$	—	$	—
At December 31, 2016
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	674	$	(2	)	$	—	$	—
Residential mortgage-backed securities - Agency	19	$	586	$	(5	)	$	—	$	—
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	31	$	61	$	(1	)	$	—	$	—

There were no losses related to other-than-temporary impairments during the three and six months ended June 30, 2017 and 2016.

The following table provides information about proceeds from sales, recognized gains and losses and net unrealized gains and losses on available-for-sale securities (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Net unrealized gain recorded in other comprehensive income, before-tax	$	—	$	6	$	2	$	29
Net unrealized gain recorded in other comprehensive income, after-tax	$	—	$	4	$	1	$	18

10

Maturities of available-for-sale debt securities and held-to-maturity debt securities are provided in the table below (dollars in millions):
	One Year or Less		After One Year Through Five Years		After Five Years Through Ten Years		After Ten Years		Total
At June 30, 2017
Available-for-Sale Investment Securities—Amortized Cost
U.S. Treasury securities	$	—	$	676	$	—	$	—	$	676
Residential mortgage-backed securities - Agency	—		73		560		194		827
Total available-for-sale investment securities	$	—	$	749	$	560	$	194	$	1,503
Held-to-Maturity Investment Securities—Amortized Cost
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180
Available-for-Sale Investment Securities—Fair Values
U.S. Treasury securities	$	—	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		73		559		195		827
Total available-for-sale investment securities	$	—	$	745	$	559	$	195	$	1,499
Held-to-Maturity Investment Securities—Fair Values
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180

Other Investments

As a part of the Company's community reinvestment initiatives, the Company has made equity investments in certain limited partnerships and limited liability companies that finance the construction and rehabilitation of affordable rental housing, as well as stimulate economic development in low to moderate income communities. These investments are accounted for using the equity method of accounting and are recorded within other assets. The related commitment for future investments is recorded in accrued expenses and other liabilities within the condensed consolidated statements of financial condition. The portion of each investment's operating results allocable to the Company is recorded in other expense within the condensed consolidated statements of income. The Company earns a return primarily through the receipt of tax credits allocated to the affordable housing projects and the community revitalization projects. These investments are not consolidated as the Company does not have a controlling financial interest in the entities. As of June 30, 2017 and December 31, 2016, the Company had outstanding investments in these entities of $332 million and $326 million, respectively, and related contingent liabilities of $74 million and $64 million, respectively. Of the above outstanding equity investments, the Company had $290 million and $270 million of investments related to affordable housing projects as of June 30, 2017 and December 31, 2016, respectively, which had $74 million and $64 million related contingent liabilities, respectively.

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3. Loan Receivables

The Company has three loan portfolio segments: credit card loans, other loans and PCI loans.

The Company's classes of receivables within the three portfolio segments are depicted in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Loan receivables
Credit card loans(1)	$	61,797		$	61,522
Other loans
Personal loans	6,955			6,481
Private student loans	6,594			6,393
Other	329			274
Total other loans	13,878			13,148
PCI loans(2)	2,322			2,584
Total loan receivables	77,997			77,254
Allowance for loan losses	(2,384		)	(2,167		)
Net loan receivables	$	75,613		$	75,087

(1) Amounts include $21.2 billion and $20.8 billion underlying investors’ interest in trust debt at June 30, 2017 and December 31, 2016, respectively, and $8.9 billion and $10.8 billion in seller's interest at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

(2) Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

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Credit Quality Indicators

The Company regularly reviews its collection experience (including delinquencies and net charge-offs) in determining its allowance for loan losses.

Information related to the delinquent and non-accruing loans in the Company’s loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading “— Purchased Credit-Impaired Loans” (dollars in millions):
	30-89 Days Delinquent		90 or More Days Delinquent		Total Past Due		90 or More Days Delinquent and Accruing		Total Non-accruing(1)
At June 30, 2017
Credit card loans(2)	$	634	$	603	$	1,237	$	540	$	206
Other loans
Personal loans(3)	57		21		78		20		10
Private student loans (excluding PCI)(4)	98		42		140		42		—
Other	1		1		2		—		10
Total other loans (excluding PCI)	156		64		220		62		20
Total loan receivables (excluding PCI)	$	790	$	667	$	1,457	$	602	$	226
At December 31, 2016
Credit card loans(2)	$	655	$	597	$	1,252	$	544	$	189
Other loans
Personal loans(3)	55		19		74		18		8
Private student loans (excluding PCI)(4)	106		35		141		35		—
Other	1		1		2		—		19
Total other loans (excluding PCI)	162		55		217		53		27
Total loan receivables (excluding PCI)	$	817	$	652	$	1,469	$	597	$	216

(1) The Company estimates that the gross interest income that would have been recorded in accordance with the original terms of non-accruing credit card loans was $9 million and $7 million for the three months ended June 30, 2017 and 2016, respectively, and $17 million and $15 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not separately track the amount of gross interest income that would have been recorded in accordance with the original terms of loans. This amount was estimated based on customers' current balances and most recent interest rates.

(2) Credit card loans that are 90 or more days delinquent and accruing interest include $61 million and $58 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(3) Personal loans that are 90 or more days delinquent and accruing interest include $3 million and $2 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(4) Private student loans that are 90 or more days delinquent and accruing interest include $5 million and $3 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016.

13

Information related to the net charge-offs in the Company's loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading "— Purchased Credit-Impaired Loans" (dollars in millions):
	For the Three Months Ended June 30,
	2017				2016
	Net Charge-offs		Net  Charge-off Rate(1)		Net Charge-offs		Net  Charge-off Rate(1)
Credit card loans	$	445	2.94	%	$	334	2.39	%
Other loans
Personal loans	54		3.18	%	33		2.38	%
Private student loans (excluding PCI)	20		1.15	%	17		1.10	%
Other	1		0.30	%	—		—	%
Total other loans	75		2.14	%	50		1.68	%
Net charge-offs (excluding PCI)	$	520	2.79	%	$	384	2.27	%
Net charge-offs (including PCI)	$	520	2.71	%	$	384	2.18	%
	For the Six Months Ended June 30,
	2017				2016
	Net Charge-off Dollars		Net  Charge-off Rate(1)		Net Charge-off Dollars		Net  Charge-off Rate(1)
Credit card loans	$	867	2.89	%	$	660	2.37	%
Other loans
Personal loans	105		3.17	%	67		2.41	%
Private student loans (excluding PCI)	34		0.99	%	29		0.98	%
Other	3		1.79	%	—		—	%
Total other loans	142		2.08	%	96		1.64	%
Net charge-offs (excluding PCI)	$	1,009	2.74	%	$	756	2.24	%
Net charge-offs (including PCI)	$	1,009	2.65	%	$	756	2.15	%

(1) Net charge-off rate represents net charge-off dollars (annualized) divided by average loans for the reporting period.

As part of credit risk management activities, on an ongoing basis, the Company reviews information related to the performance of a customer’s account with the Company as well as information from credit bureaus, such as FICO or other credit scores, relating to the customer’s broader credit performance. FICO scores are generally obtained at origination of the account and are refreshed monthly or quarterly thereafter to assist in predicting customer behavior. Historically, the Company has noted that a significant portion of delinquent accounts have FICO scores below 660.

The following table provides the most recent FICO scores available for the Company’s customers as a percentage of each class of loan receivables:
	Credit Risk Profile by FICO Score
	660 and  Above		Less than 660 or No Score
At June 30, 2017
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	96	%	4	%
At December 31, 2016
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	95	%	5	%

(1) PCI loans are discussed under the heading "— Purchased Credit-Impaired Loans."

For private student loans, additional credit risk management activities include monitoring the amount of loans in forbearance. Forbearance allows borrowers experiencing temporary financial difficulties and willing to make payments, the

14

ability to temporarily suspend payments. Eligible borrowers have a lifetime cap on forbearance of 12 months. At June 30, 2017 and December 31, 2016, there were $28 million and $19 million, respectively, of private student loans, including PCI, in forbearance, representing 0.5% and 0.3%, respectively, of total student loans in repayment and forbearance.

Allowance for Loan Losses

The following tables provide changes in the Company’s allowance for loan losses (dollars in millions):
	For the Three Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,892		$	207		$	156		$	9		$	2,264
Additions
Provision for loan losses	533			82			23			2			640
Deductions
Charge-offs	(561		)	(61		)	(22		)	(1		)	(645		)
Recoveries	116			7			2			—			125
Net charge-offs	(445		)	(54		)	(20		)	(1		)	(520		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Three Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,590		$	165		$	148		$	18		$	1,921
Additions
Provision for loan losses	347			44			20			1			412
Deductions
Charge-offs	(448		)	(38		)	(19		)	—			(505		)
Recoveries	114			5			2			—			121
Net charge-offs	(334		)	(33		)	(17		)	—			(384		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949
	For the Six Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,790		$	200		$	158		$	19		$	2,167
Additions
Provision for loan losses	1,057			140			35			(6		)	1,226
Deductions
Charge-offs	(1,096		)	(118		)	(39		)	(3		)	(1,256		)
Recoveries	229			13			5			—			247
Net charge-offs	(867		)	(105		)	(34		)	(3		)	(1,009		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Six Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,554		$	155		$	143		$	17		$	1,869
Additions
Provision for loan losses	709			88			37			2			836
Deductions
Charge-offs	(887		)	(77		)	(34		)	—			(998		)
Recoveries	227			10			5			—			242
Net charge-offs	(660		)	(67		)	(29		)	—			(756		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949

(1) Includes both PCI and non-PCI private student loans.

15

Net charge-offs of principal are recorded against the allowance for loan losses, as shown in the preceding table. Information regarding net charge-offs of interest and fee revenues on credit card and other loans is as follows (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Interest and fees accrued subsequently charged off, net of recoveries (recorded as a reduction of interest income)	$	87	$	67	$	171	$	136
Fees accrued subsequently charged off, net of recoveries (recorded as a reduction to other income)	$	23	$	17	$	45	$	34

The following tables provide additional detail of the Company’s allowance for loan losses and recorded investment in its loan portfolio by impairment methodology (dollars in millions):
	Credit Card		Personal Loans		Student Loans(1)		Other Loans		Total
At June 30, 2017
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,789	$	210	$	106	$	3	$	2,108
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	191		25		20		7		243
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		33		—		33
Total allowance for loan losses	$	1,980	$	235	$	159	$	10	$	2,384
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,649	$	6,863	$	6,479	$	283	$	74,274
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,148		92		115		46		1,401
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,322		—		2,322
Total recorded investment	$	61,797	$	6,955	$	8,916	$	329	$	77,997
At December 31, 2016
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,623	$	179	$	105	$	3	$	1,910
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	167		21		18		16		222
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		35		—		35
Total allowance for loan losses	$	1,790	$	200	$	158	$	19	$	2,167
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,437	$	6,400	$	6,307	$	219	$	73,363
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,085		81		86		55		1,307
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,584		—		2,584
Total recorded investment	$	61,522	$	6,481	$	8,977	$	274	$	77,254

(1) Includes both PCI and non-PCI private student loans.

(2) Loan receivables evaluated for impairment in accordance with Accounting Standards Codification ("ASC") 310-10-35 include credit card loans, personal loans and student loans collectively evaluated for impairment in accordance with ASC Subtopic 310-40, Receivables, which consists of modified loans accounted for as troubled debt restructurings. Other loans are individually evaluated for impairment and generally do not represent troubled debt restructurings.

(3) The unpaid principal balance of credit card loans was $994 million and $935 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of personal loans was $91 million and $79 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of student loans was $113 million and $84 million at June 30, 2017 and December 31, 2016, respectively. All loans accounted for as troubled debt restructurings have a related allowance for loan losses.

16

Troubled Debt Restructurings

The Company has internal loan modification programs that provide relief to credit card, personal loan and student loan borrowers who are experiencing financial hardship. The internal loan modification programs include both temporary and permanent programs which vary by product. External loan modification programs are also available for credit card and personal loans. Temporary and permanent modifications on credit card and personal loans, as well as temporary modifications on student loans and certain grants of student loan forbearance, result in the loans being considered individually impaired. In addition, loans that defaulted or graduated from modification programs or forbearance are considered to be individually impaired.

For credit card customers, the temporary hardship program primarily consists of a reduced minimum payment and an interest rate reduction, both lasting for a period no longer than 12 months. The permanent workout program involves changing the structure of the loan to a fixed payment loan with a maturity no longer than 60 months and reducing the interest rate on the loan. The permanent modification program does not normally provide for the forgiveness of unpaid principal, but may allow for the reversal of certain unpaid interest or fee assessments. The Company also makes permanent loan modifications for customers who request financial assistance through external sources, such as a consumer credit counseling agency program. These loans typically receive a reduced interest rate but continue to be subject to the original minimum payment terms and do not normally include waiver of unpaid principal, interest or fees. Credit card loans included in temporary and permanent programs are accounted for as troubled debt restructurings.

For personal loan customers, in certain situations the Company offers various payment programs, including temporary and permanent programs. The temporary programs normally consist of a reduction of the minimum payment for a period of no longer than 12 months with the option of a final balloon payment required at the end of the loan term or an extension of the maturity date with the total term not exceeding nine years. Further, in certain circumstances the interest rate on the loan is reduced. The permanent program involves changing the terms of the loan in order to pay off the outstanding balance over a longer term and also in certain circumstances reducing the interest rate on the loan. Similar to the temporary programs, the total term may not exceed nine years. The Company also allows permanent loan modifications for customers who request financial assistance through external sources, similar to the credit card customers discussed above. Payments are modified based on the new terms agreed upon with the credit counseling agency. Personal loans included in temporary and permanent programs are accounted for as troubled debt restructurings.

To assist student loan borrowers who are experiencing temporary financial difficulties but are willing to resume making payments, the Company may offer hardship forbearance or programs that include payment deferral, temporary payment reduction, temporary interest rate reduction or extended terms. A modified loan typically meets the definition of a troubled debt restructuring based on the cumulative length of the concession period and an evaluation of the credit quality of the borrower, based on FICO scores. Prior to the third quarter of 2016, only a second forbearance when the borrower was 30 days or greater delinquent was considered a troubled debt restructuring. As a result, the student loan balances being accounted for as troubled debt restructurings increased, although it did not lead to significant changes in the balance of the overall allowance for loan losses.

The Company monitors borrower performance after using payment programs or forbearance and the Company believes the programs help to prevent defaults and are useful in assisting customers experiencing financial difficulties. The Company plans to continue to use payment programs and forbearance and, as a result, expects to have additional loans classified as troubled debt restructurings in the future.

17

Additional information about modified loans classified as troubled debt restructurings is shown below (dollars in millions):
	Average recorded investment in loans		Interest income recognized during period loans were impaired(1)		Gross interest income that would have been recorded with original terms(2)
For the Three Months Ended June 30, 2017
Credit card loans(3)	$	1,137	$	25	$	22
Personal loans	$	90	$	3	$	1
Private student loans(4)	$	107	$	1	$	—
For the Three Months Ended June 30, 2016
Credit card loans(3)	$	1,016	$	22	$	19
Personal loans	$	71	$	2	$	—
Private student loans(4)	$	53	$	1	N/A
For the Six Months Ended June 30, 2017
Credit card loans(3)	$	1,122	$	50	$	42
Personal loans	$	87	$	5	$	2
Private student loans(4)	$	101	$	3	$	—
For the Six Months Ended June 30, 2016
Credit card loans(3)	$	1,019	$	42	$	39
Personal loans	$	70	$	4	$	1
Private student loans(4)	$	52	$	2	N/A

(1) The Company does not separately track interest income on loans in modification programs. Amounts shown are estimated by applying an average interest rate to the average loans in the various modification programs.

(2) The Company does not separately track the amount of additional gross interest income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. Amounts shown are estimated by applying the difference between the average interest rate earned on non-impaired loans and the average interest rate earned on loans in the modification programs to the average loans in the modification programs.

(3) Includes credit card loans that were modified in troubled debt restructurings, but are no longer enrolled in a troubled debt restructuring program due to noncompliance with the terms of the modification or successful completion of a program. The average balance of credit card loans that were no longer enrolled in a troubled debt restructuring program was $324 million and $274 million, respectively, for the three months ended June 30, 2017 and 2016, and $317 million and $274 million for the six months ended June 30, 2017 and 2016.

(4) As a result of the updates implemented in the third quarter of 2016, some student loans accounted for as troubled debt restructurings have additional gross income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. For the three and six months ended June 30, 2017, the gross income that would have been recorded with original terms for student loans in modification programs was not material.

In order to evaluate the primary financial effects that resulted from credit card loans entering into a loan modification program during the three and six months ended June 30, 2017 and 2016, the Company quantified the amount by which interest and fees were reduced during the periods. During the three months ended June 30, 2017 and 2016, the Company forgave approximately $10 million and $7 million, respectively, of interest and fees as a result of accounts entering into a credit card loan modification program. During the six months ended June 30, 2017 and 2016, the Company forgave approximately $21 million and $16 million, respectively, of interest and fees as a result of accounts entering into a credit card loan modification program.

18

The following table provides information on loans that entered a loan modification program during the period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	26,078	$	157	19,780	$	118
Personal loans	1,430	$	18	1,027	$	12
Private student loans	1,003	$	18	289	$	4
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	56,971	$	338	42,064	$	253
Personal loans	2,993	$	36	2,088	$	24
Private student loans	2,020	$	35	741	$	12

The following table presents the carrying value of loans that experienced a payment default during the period that had been modified in a troubled debt restructuring during the 15 months preceding the end of each period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	8,049	$	43	4,380	$	23
Personal loans(2)	341	$	4	276	$	3
Private student loans(3)	184	$	3	177	$	3
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	16,215	$	87	9,080	$	48
Personal loans(2)	648	$	8	434	$	5
Private student loans(3)	369	$	6	374	$	6

(1) Terms revert back to the pre-modification terms for customers who default from a temporary program and charging privileges remain revoked in most cases.

(2) For credit card loans and personal loans, a customer defaults from a modification program after two consecutive missed payments. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

(3) For student loans, defaults have been defined as loans that are 60 or more days delinquent. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

Of the account balances that defaulted as shown above for the three months ended June 30, 2017 and 2016, approximately 39% and 34%, respectively, of the total balances were charged off at the end of the month in which they defaulted. Of the account balances that defaulted as shown above for the six months ended June 30, 2017 and 2016, approximately 39% and 35%, respectively, of the total balances were charged off at the end of the month in which that defaulted. For accounts that have defaulted from a loan modification program and have not been subsequently charged off, the balances are included in the allowance for loan loss analysis discussed above under "— Allowance for Loan Losses."

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Purchased Credit-Impaired Loans

Purchased loans with evidence of credit deterioration since origination for which it is probable that not all contractually required payments will be collected are considered impaired at acquisition and are reported as PCI loans. The private student loans acquired in the SLC transaction, as well as the additional acquired private student loan portfolio comprise the Company’s only PCI loans at June 30, 2017 and December 31, 2016. Total PCI student loans had an outstanding balance of $2.4 billion and $2.7 billion, including accrued interest, and a related carrying amount of $2.3 billion and $2.6 billion as of June 30, 2017 and December 31, 2016, respectively.

The following table provides changes in accretable yield for the acquired loans during each period (dollars in millions):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	755		$	916		$	796		$	965
Accretion into interest income	(40		)	(47		)	(81		)	(96		)
Other changes in expected cash flows	10			19			10			19
Balance at end of period	$	725		$	888		$	725		$	888

Periodically, the Company updates the estimate of cash flows expected to be collected based on management's latest expectations of future credit losses, borrower prepayments and certain other assumptions that affect cash flows. No provision expense was recorded during the three and six months ended June 30, 2017 and 2016. The allowance for PCI loan losses at June 30, 2017 and December 31, 2016 was $33 million and $35 million. For the three and six months ended June 30, 2017 and 2016, increase in accretable yield was primarily driven by the increases in the rates on variable loans during the first half of 2017 and 2016. Changes to accretable yield are recognized prospectively as an adjustment to yield over the remaining life of the pools.

At June 30, 2017, the 30 or more days delinquency and 90 or more days delinquency rates on PCI student loans (which include loans not yet in repayment) were 2.70% and 0.85%, respectively. At December 31, 2016, the 30 or more days delinquency and 90 or more days delinquency rates on PCI student loans (which include loans not yet in repayment) were 2.88% and 0.87%, respectively. These rates include private student loans that are greater than 120 days delinquent that are covered by an indemnification agreement or insurance arrangements through which the Company expects to recover a substantial portion of the loan. The net charge-off rate on PCI student loans was 0.64% and 0.48% for the three months ended June 30, 2017 and 2016, respectively, and 0.58% and 0.46% for the six months ended June 30, 2017 and 2016, respectively.

4. Credit Card and Student Loan Securitization Activities

The Company’s securitizations are accounted for as secured borrowings and the trusts are treated as consolidated subsidiaries of the Company. For a description of the Company’s principles of consolidation with respect to VIEs, see Note 1: Background and Basis of Presentation of the Company’s annual report on Form 10-K for the year ended December 31, 2016.

Credit Card Securitization Activities

The Company accesses the term asset securitization market through the Discover Card Master Trust I (“DCMT”) and the Discover Card Execution Note Trust (“DCENT”). Credit card loan receivables are transferred into DCMT and beneficial interests in DCMT are transferred into DCENT. Interests in DCENT are issued to investors in the form of debt securities and are reported in long-term borrowings.

The DCENT debt structure consists of four classes of securities (DiscoverSeries Class A, B, C and D notes), with the most senior class generally receiving a triple-A rating. In order to issue senior, higher rated classes of notes, it is necessary to obtain the appropriate amount of credit enhancement, generally through the issuance of junior, lower rated or more highly subordinated classes of notes. The subordinated classes are held by wholly-owned subsidiaries of Discover Bank. The Company is exposed to credit-related risk of loss associated with trust assets as of the balance sheet date through the retention of these subordinated interests. The estimated probable incurred loss is included in the allowance for loan losses estimate.

The Company’s retained interests in the assets of the trusts, consisting of investments in DCENT notes held by subsidiaries of Discover Bank, constitute intercompany positions which are eliminated in the preparation of the Company’s condensed consolidated statements of financial condition.

20

Upon transfer of credit card loan receivables to the trust, the receivables and certain cash flows derived from them become restricted for use in meeting obligations to the trusts’ creditors. Further, the transferred credit card loan receivables are owned by the trust and are not available to third-party creditors of the Company. The trusts have ownership of cash balances, the amounts of which are reported in restricted cash. With the exception of the seller’s interest in trust receivables, the Company’s interests in trust assets are generally subordinate to the interests of third-party investors and, as such, may not be realized by the Company if needed to absorb deficiencies in cash flows that are allocated to the investors in the trusts’ debt. Apart from the restricted assets related to securitization activities, the investors and the securitization trusts have no recourse to the Company’s other assets or the Company's general credit for a shortage in cash flows.

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	26		$	23
Investors’ interests held by third-party investors	16,100			15,625
Investors’ interests held by wholly-owned subsidiaries of Discover Bank	5,113			5,189
Seller’s interest	8,894			10,812
Loan receivables(1)	30,107			31,626
Allowance for loan losses allocated to securitized loan receivables(1)	(970		)	(928		)
Net loan receivables	29,137			30,698
Other	5			4
Carrying value of assets of consolidated variable interest entities	$	29,168		$	30,725

(1) The Company maintains its allowance for loan losses at an amount sufficient to absorb probable losses inherent in all loan receivables, which includes all loan receivables in the trusts. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company’s balance sheet in accordance with GAAP.

The debt securities issued by the consolidated trusts are subject to credit, payment and interest rate risks on the transferred credit card loan receivables. To protect investors in the securities, there are certain features or triggering events that could cause an early amortization of the debt securities, including triggers related to the impact of the performance of the trust receivables on the availability and adequacy of cash flows to meet contractual requirements. As of June 30, 2017, no economic or other early amortization events have occurred.

The Company continues to own and service the accounts that generate the loan receivables held by the trusts. Discover Bank receives servicing fees from the trusts based on a percentage of the monthly investor principal balance outstanding. Although the fee income to Discover Bank offsets the fee expense to the trusts and thus is eliminated in consolidation, failure to service the transferred loan receivables in accordance with contractual requirements could lead to a termination of the servicing rights and the loss of future servicing income, net of related expenses.

Student Loan Securitization Activities

Student loan trust receivables underlying third-party investors’ interests are recorded in PCI loans and the related debt issued by the trusts is reported in long-term borrowings. The assets of the trusts are restricted from being sold or pledged as collateral for other borrowings and the cash flows from these restricted assets may be used only to pay obligations of the trusts. With the exception of the trusts’ restricted assets, the trusts and investors have no recourse to the Company’s other assets or the Company's general credit for a shortage in cash flows.

Currently there are three trusts from which securities were issued to investors. Principal payments on the long-term secured borrowings are made as cash is collected on the underlying loans that are used as collateral on the secured borrowings. The Company does not have access to cash collected by the securitization trusts until cash is released in accordance with the trust indenture agreements and, for certain securitizations, no cash will be released to the Company until all outstanding trust borrowings have been repaid. Similar to the credit card securitizations, the Company continues to own and service the accounts that generate the student loan receivables held by the trusts and receives servicing fees from the trusts based on either a percentage of the principal balance outstanding or a flat fee per borrower. Although the servicing fee income offsets the fee expense related to the trusts and thus is eliminated in consolidation, failure to service the transferred loan receivables in accordance with contractual requirements could lead to a termination of the servicing rights and the loss of future servicing income, net of related expenses.

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Under terms of all the trust arrangements, the Company has the option, but not the obligation, to provide financial support to the trusts, but has never provided such support. A substantial portion of the credit risk associated with the securitized loans has been transferred to third parties under private credit insurance or indemnification arrangements.

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	67		$	72
Student loan receivables(1)	1,249			1,390
Allowance for loan losses allocated to securitized loan receivables(1)	(25		)	(27		)
Net student loan receivables	1,224			1,363
Carrying value of assets of consolidated variable interest entities	$	1,291		$	1,435

(1) The Company maintains its allowance for loan losses on PCI loans sufficient to absorb probable decreases in cash flows that were previously expected. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company's balance sheet in accordance with GAAP.

5. Deposits

The Company offers its deposit products to customers through two channels: (i) through direct marketing, internet origination and affinity relationships (“direct-to-consumer deposits”); and (ii) indirectly through contractual arrangements with securities brokerage firms (“brokered deposits”). Direct-to-consumer deposits include certificates of deposit, money market accounts, online savings and checking accounts and IRA certificates of deposit, while brokered deposits include certificates of deposit and sweep accounts.

The following table provides a summary of interest-bearing deposit accounts (dollars in millions):
	June 30, 2017		December 31, 2016
Certificates of deposit in amounts less than $100,000	$	19,597	$	20,225
Certificates of deposit in amounts $100,000 or greater(1)	5,977		5,864
Savings deposits, including money market deposit accounts	26,785		25,372
Total interest-bearing deposits	$	52,359	$	51,461

(1) Includes $1.4 billion in certificates of deposit greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of June 30, 2017 and December 31, 2016.

The following table summarizes certificates of deposit in amounts of $100,000 or greater by contractual maturity (dollars in millions):
Maturity Period	June 30, 2017
Three months or less	$	899
Over three months through six months	811
Over six months through twelve months	1,574
Over twelve months	2,693
Total	$	5,977

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The following table summarizes certificates of deposit maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	5,966
2018	8,193
2019	3,435
2020	2,671
2021	1,879
Thereafter	3,430
Total	$	25,574

6. Long-Term Borrowings

Long-term borrowings consist of borrowings having original maturities of one year or more. The following table provides a summary of the Company’s long-term borrowings and weighted-average interest rates on outstanding balances (dollars in millions):
	June 30, 2017					December 31, 2016
	Maturity	Interest Rate	Weighted-Average Interest Rate	Outstanding Amount		Outstanding Amount
Securitized Debt
Fixed-rate asset-backed securities(1)	2017-2024	1.39%-5.65%	2.17%	$	9,818	$	9,868
Floating-rate asset-backed securities(2)(3)	2018-2024	1.39%-1.83%	1.60%	6,212		5,694
Total Discover Card Master Trust I and Discover Card Execution Note Trust				16,030		15,562
Floating-rate asset-backed securities(4)(5)(6)(7)	2031-2042	1.33%-5.00%	2.81%	708		849
Total SLC Private Student Loan Trusts				708		849
Total long-term borrowings - owed to securitization investors				16,738		16,411
Discover Financial Services (Parent Company)
Fixed-rate senior notes(1)	2019-2027	3.75%-10.25%	4.25%	2,695		2,090
Fixed-rate retail notes	2017-2031	2.85%-4.40%	3.70%	227		169
Discover Bank
Fixed-rate senior bank notes(1)	2018-2026	2.00%-4.25%	3.21%	6,081		6,077
Fixed-rate subordinated bank notes	2019-2020	7.00%-8.70%	7.49%	697		696
Total long-term borrowings				$	26,438	$	25,443

(1) The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in London Interbank Offered Rate (“LIBOR”). Use of these interest rate swaps impacts carrying value of the debt.

(2) Discover Card Execution Note Trust floating-rate asset-backed securities include issuances with the following interest rate terms: 1-month LIBOR + 23 to 60 basis points as of June 30, 2017.

(3) The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on a portion of these long-term borrowings. There is no impact on debt carrying value from use of these interest rate swaps. See Note 14: Derivatives and Hedging Activities for additional information.

(4) SLC Private Student Loan Trusts floating-rate asset-backed securities include issuances with the following interest rate terms: 3-month LIBOR + 17 to 45 basis points, Prime rate + 75 to 100 basis points and 1-month LIBOR + 350 basis points as of June 30, 2017.

(5) The Company acquired an interest rate swap related to the securitized debt assumed in the SLC transaction which matured and is no longer outstanding as of June 30, 2017. The swap did not qualify for hedge accounting and had no impact on debt carrying value. See Note 14: Derivatives and Hedging Activities for additional information.

(6) Repayment of this debt is dependent upon the timing of principal and interest payments on the underlying student loans. The dates shown represent final maturity dates.

(7) Includes $255 million of senior notes maturing in 2031, $436 million of senior and subordinated notes maturing in 2036 and $17 million of senior notes maturing in 2042 as of June 30, 2017.

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The following table summarizes long-term borrowings maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	2,201
2018	5,269
2019	5,991
2020	3,433
2021	1,040
Thereafter	8,504
Total	$	26,438

The Company has access to committed undrawn capacity through private securitizations to support the funding of its credit card loan receivables. As of June 30, 2017, the total commitment of secured credit facilities through private providers was $6.0 billion, none of which was drawn as of June 30, 2017. Access to the unused portions of the secured credit facilities is subject to the terms of the agreements with each of the providers which have various expirations in calendar years 2018 through 2020. Borrowings outstanding under each facility bear interest at a margin above LIBOR or the asset-backed commercial paper costs of each individual conduit provider. The terms of each agreement provide for a commitment fee to be paid on the unused capacity and include various affirmative and negative covenants, including performance metrics and legal requirements similar to those required to issue any term securitization transaction.

7. Accumulated Other Comprehensive Income

Changes in each component of accumulated other comprehensive income (loss) ("AOCI") were as follows (dollars in millions):
	Unrealized (Loss) Gain on Available-for-Sale Investment Securities, Net of Tax			(Loss) Gain on Cash Flow Hedges, Net of Tax			Pension Plan Loss, Net of Tax			AOCI
For the Three Months Ended June 30, 2017
Balance at March 31, 2017	$	(2	)	$	(8	)	$	(145	)	$	(155	)
Net change	—			5			—			5
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Three Months Ended June 30, 2016
Balance at March 31, 2016	$	14		$	(46	)	$	(140	)	$	(172	)
Net change	4			(6		)	—			(2		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)
For the Six Months Ended June 30, 2017
Balance at December 31, 2016	$	(3	)	$	(13	)	$	(145	)	$	(161	)
Net change	1			10			—			11
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Six Months Ended June 30, 2016
Balance at December 31, 2015	$	—		$	(20	)	$	(140	)	$	(160	)
Net change	18			(32		)	—			(14		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)

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The table below presents each component of other comprehensive income (loss) ("OCI") before reclassifications and amounts reclassified from AOCI for each component of OCI before- and after-tax (dollars in millions):
	Before Tax			Tax (Expense) Benefit			Net of Tax
For the Three Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain (loss) arising during the period	$	—		$	—		$	—
Net change	$	—		$	—		$	—
Cash Flow Hedges
Net unrealized gain arising during the period	$	3		$	(1	)	$	2
Amounts reclassified from AOCI	3			—			3
Net change	$	6		$	(1	)	$	5
For the Three Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	6		$	(2	)	$	4
Net change	$	6		$	(2	)	$	4
Cash Flow Hedges
Net unrealized loss arising during the period	$	(18	)	$	6		$	(12	)
Amounts reclassified from AOCI	9			(3		)	6
Net change	$	(9	)	$	3		$	(6	)
For the Six Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	2		$	(1	)	$	1
Net change	$	2		$	(1	)	$	1
Cash Flow Hedges
Net unrealized gain arising during the period	$	9		$	(4	)	$	5
Amounts reclassified from AOCI	8			(3		)	5
Net change	$	17		$	(7	)	$	10
For the Six Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	29		$	(11	)	$	18
Net change	$	29		$	(11	)	$	18
Cash Flow Hedges
Net unrealized loss arising during the period	$	(70	)	$	27		$	(43	)
Amounts reclassified from AOCI	18			(7		)	11
Net change	$	(52	)	$	20		$	(32	)

8. Income Taxes

The following table presents the calculation of the Company's effective income tax rate (dollars in millions, except effective income tax rate):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Income before income tax expense	$	867		$	898		$	1,735		$	1,812
Income tax expense	$	321		$	282		$	625		$	621
Effective income tax rate	37.1		%	31.4		%	36.0		%	34.3		%

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Income tax expense increased $39 million and $4 million for the three and six months ended June 30, 2017, respectively, compared to the same periods in 2016. The effective tax rates for the three and six months ended June 30, 2017 of 37.1% and 36.0%, respectively, increased from 31.4% and 34.3% for the same periods in 2016. The increase in rates is primarily due to the settlement with the United States Congress Joint Committee on Taxation that occurred in the second quarter of 2016.

The Company is subject to examination by the Internal Revenue Service ("IRS") and tax authorities in various state, local and foreign tax jurisdictions. The Company regularly assesses the likelihood of additional assessments or settlements in each of the taxing jurisdictions resulting from these and subsequent years' examinations. The 2008-2010 federal audit is currently under Administrative Appeals and the IRS is currently examining the years 2011-2015. At this time, the potential change in unrecognized tax benefits is not expected to be significant over the next 12 months. The Company believes that its reserves are sufficient to cover any tax, penalties and interest that would result from such examinations.

9. Earnings Per Share

The following table presents the calculation of basic and diluted earnings per share ("EPS") (in millions, except per share amounts):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Numerator
Net income	$	546		$	616		$	1,110		$	1,191
Preferred stock dividends	(10		)	(10		)	(19		)	(19		)
Net income available to common stockholders	536			606			1,091			1,172
Income allocated to participating securities	(4		)	(4		)	(8		)	(8		)
Net income allocated to common stockholders	$	532		$	602		$	1,083		$	1,164
Denominator
Weighted-average shares of common stock outstanding	379			410			382			414
Effect of dilutive common stock equivalents	—			1			—			—
Weighted-average shares of common stock outstanding and common stock equivalents	379			411			382			414
Basic earnings per common share	$	1.41		$	1.47		$	2.83		$	2.81
Diluted earnings per common share	$	1.40		$	1.47		$	2.83		$	2.81

Anti-dilutive securities were not material and had no impact on the computation of diluted EPS for the three and six months ended June 30, 2017 and 2016.

10. Capital Adequacy

The Company is subject to the capital adequacy guidelines of the Federal Reserve, and Discover Bank, the Company’s main banking subsidiary, is subject to various regulatory capital requirements as administered by the FDIC. Failure to meet minimum capital requirements can result in the initiation of certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the financial position and results of the Company and Discover Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and Discover Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items, as calculated under regulatory guidelines. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

In 2013, the Federal Reserve, the Office of the Comptroller of the Currency, and the FDIC issued final capital rules under the Basel Committee’s December 2010 framework (referred to as “Basel III”) establishing a new comprehensive capital framework for U.S. banking organizations. The final capital rules ("Basel III rules") substantially revise Basel I rules regarding the risk-based capital requirements applicable to bank holding companies and depository institutions, including the Company. The Basel III rules became effective for the Company on January 1, 2015. This timing is based on the Company being classified as a "Standardized Approach" entity.

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Among other things, the Basel III rules (i) introduced a new capital measure called Common Equity Tier 1 (“CET1”), (ii) specify that Tier 1 capital consists of CET1 and additional Tier 1 capital instruments meeting specified requirements, (iii) apply most deductions/adjustments to regulatory capital measures to CET1 and not to the other components of capital, thus potentially requiring higher levels of CET1 in order to meet minimum ratios and (iv) expand the scope of the deductions/adjustments from capital as compared to existing regulations.

The Basel III minimum capital ratios are as follows:

• 8.0% Total capital (i.e., Tier 1 plus Tier 2) to risk-weighted assets;

• 6.0% Tier 1 capital (i.e., CET1 plus Additional Tier 1) to risk-weighted assets;

• 4.0% Tier 1 capital to average consolidated assets as reported on consolidated financial statements (known as the “leverage ratio”); and

• 4.5% CET1 to risk-weighted assets.

As of June 30, 2017, the Company and Discover Bank met all Basel III minimum capital ratio requirements to which they were subject. The Company and Discover Bank also met the requirements to be considered "well-capitalized" under Regulation Y and prompt corrective action regulations, respectively, and there have been no conditions or events that management believes have changed the Company's or Discover Bank's category. To be categorized as “well-capitalized,” the Company and Discover Bank must maintain minimum capital ratios as set forth in the table below.

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The following table shows the actual capital amounts and ratios of the Company and Discover Bank and comparisons of each to the regulatory minimum and “well-capitalized” requirements (dollars in millions):
	Actual				Minimum Capital Requirements			Capital Requirements To Be Classified as Well-Capitalized
	Amount		Ratio		Amount		Ratio	Amount(1)		Ratio(1)
June 30, 2017
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,263	15.2	%	$	6,436	≥8.0%	$	8,045	≥10.0%
Discover Bank	$	12,392	15.5	%	$	6,376	≥8.0%	$	7,970	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,052	13.7	%	$	4,827	≥6.0%	$	4,827	≥6.0%
Discover Bank	$	10,600	13.3	%	$	4,782	≥6.0%	$	6,376	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,052	11.8	%	$	3,742	≥4.0%	N/A		N/A
Discover Bank	$	10,600	11.4	%	$	3,710	≥4.0%	$	4,637	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,492	13.0	%	$	3,620	≥4.5%	N/A		N/A
Discover Bank	$	10,600	13.3	%	$	3,587	≥4.5%	$	5,181	≥6.5%
December 31, 2016
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,445	15.5	%	$	6,408	≥8.0%	$	8,010	≥10.0%
Discover Bank	$	12,334	15.5	%	$	6,346	≥8.0%	$	7,932	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,152	13.9	%	$	4,806	≥6.0%	$	4,806	≥6.0%
Discover Bank	$	10,450	13.2	%	$	4,759	≥6.0%	$	6,346	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,152	12.3	%	$	3,624	≥4.0%	N/A		N/A
Discover Bank	$	10,450	11.6	%	$	3,591	≥4.0%	$	4,488	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,592	13.2	%	$	3,604	≥4.5%	N/A		N/A
Discover Bank	$	10,450	13.2	%	$	3,570	≥4.5%	$	5,156	≥6.5%

(1) The Basel III rules do not establish well-capitalized thresholds for these measures for bank holding companies. Existing well-capitalized thresholds established in the Federal Reserve's Regulation Y have been included where available.

11. Commitments, Contingencies and Guarantees

In the normal course of business, the Company enters into a number of off-balance sheet commitments, transactions and obligations under guarantee arrangements that expose the Company to varying degrees of risk. The Company's commitments, contingencies and guarantee relationships are described below.

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Commitments

Lease Commitments

The Company leases various office space and equipment under capital and non-cancelable operating leases, which expire at various dates through 2028. Future minimum payments on capital leases were not material at June 30, 2017. The following table shows future minimum payments on non-cancelable operating leases with original terms in excess of one year (dollars in millions):
	June 30, 2017
2017	$	6
2018	12
2019	11
2020	10
2021	9
Thereafter	41
Total minimum lease payments	$	89

Unused Commitments to Extend Credit

At June 30, 2017, the Company had unused commitments to extend credit for loans of approximately $184.3 billion. Such commitments arise primarily from agreements with customers for unused lines of credit on certain credit cards and certain other loan products, provided there is no violation of conditions in the related agreements. These commitments, substantially all of which the Company can terminate at any time and which do not necessarily represent future cash requirements, are periodically reviewed based on account usage, customer creditworthiness and loan qualification.

Contingencies

See Note 12: Litigation and Regulatory Matters for a description of potential liability arising from pending litigation or regulatory proceedings involving the Company.

Guarantees

The Company has obligations under certain guarantee arrangements, including contracts, indemnification agreements, and representations and warranties, which contingently require the Company to make payments to the guaranteed party based on changes in an underlying asset, liability or equity security of a guaranteed party, rate or index. Also included as guarantees are contracts that contingently require the Company to make payments to a guaranteed party based on another entity's failure to perform under an agreement. The Company's use of guarantees is disclosed below by type of guarantee.

Securitizations Representations and Warranties

As part of the Company’s financing activities, the Company provides representations and warranties that certain assets pledged as collateral in secured borrowing arrangements conform to specified guidelines. Due diligence is performed by the Company which is intended to ensure that asset guideline qualifications are met. If the assets pledged as collateral do not meet certain conforming guidelines, the Company may be required to replace, repurchase or sell such assets. In its credit card securitization activities, the Company would replace nonconforming receivables through the allocation of excess seller’s interest or from additional transfers from the unrestricted pool of receivables. If the Company could not add enough receivables to satisfy the requirement, an early amortization (or repayment) of investors’ interests would be triggered. In its student loan securitizations, the Company would generally repurchase the loans from the trust at the outstanding principal amount plus interest.

The maximum potential amount of future payments the Company could be required to make would be equal to the current outstanding balances of third-party investor interests in credit card asset-backed securities, and the principal amount of any student loan secured borrowings, plus any unpaid interest for the corresponding secured borrowings. The Company has recorded substantially all of the maximum potential amount of future payments in long-term borrowings on the Company’s condensed consolidated statements of financial condition. The Company has not recorded any incremental contingent liability associated with its secured borrowing representations and warranties. Management believes that the

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probability of having to replace, repurchase or sell assets pledged as collateral under secured borrowing arrangements, including an early amortization event, is low.

Mortgage Loans Representations and Warranties

The Company sold loans it originated to investors on a servicing-released basis and the risk of loss or default by the borrower is generally transferred to the investor. However, the Company was required by these investors to make certain representations and warranties relating to credit information, loan documentation and collateral. These representations and warranties may extend through the contractual life of the mortgage loan, even though the Company closed the mortgage origination business. Subsequent to the sale, if underwriting deficiencies, borrower fraud or documentation defects are discovered in individual mortgage loans, the Company may be obligated to repurchase the respective mortgage loan or indemnify the investors for any losses from borrower defaults if such deficiency or defect cannot be cured within the specified period following discovery. The Company has established a repurchase reserve based on expected losses. At June 30, 2017, this amount was not material and was included in accrued expenses and other liabilities on the condensed consolidated statements of financial condition.

Counterparty Settlement Guarantees

Diners Club and DFS Services LLC (on behalf of PULSE) have various counterparty exposures, which are listed below.

• Merchant Guarantee. Diners Club has entered into contractual relationships with certain international merchants, which generally include travel-related businesses, for the benefit of all Diners Club licensees. The licensees hold the primary liability to settle the transactions of their customers with these merchants. However, Diners Club retains a counterparty exposure if a licensee fails to meet its financial payment obligation to one of these merchants.

• ATM Guarantee. PULSE entered into contractual relationships with certain international ATM acquirers in which DFS Services LLC retains counterparty exposure if an issuer fails to fulfill its settlement obligation.

• Network Alliance Guarantee. Discover Network, Diners Club and PULSE have entered into contractual relationships with certain international payment networks in which DFS Services LLC retains the counterparty exposure if a network fails to fulfill its settlement obligation.

The maximum potential amount of future payments related to such contingent obligations is dependent upon the transaction volume processed between the time a potential counterparty defaults on its settlement and the time at which the Company disables the settlement of any further transactions for the defaulting party. However, there is no limitation on the maximum amount the Company may be liable to pay. The actual amount of the potential exposure cannot be quantified as the Company cannot determine whether particular counterparties will fail to meet their settlement obligations.

While the Company has some contractual remedies to offset these counterparty settlement exposures (such as letters of credit or pledged deposits), in the event that all licensees and/or issuers were to become unable to settle their transactions, the Company estimates its maximum potential counterparty exposures to these settlement guarantees, based on historical transaction volume, would be $152 million for merchant guarantees as of June 30, 2017. The maximum potential counterparty exposures to these settlement guarantees for ATM guarantees would be immaterial as of June 30, 2017. The maximum potential counterparty exposures for network alliance guarantees would be $31 million as of June 30, 2017.

The Company believes that the estimated amounts of maximum potential future payments are not representative of the Company's actual potential loss exposure given Diners Club's and PULSE's insignificant historical losses from these counterparty exposures. As of June 30, 2017, the Company had not recorded any contingent liability in the consolidated financial statements for these counterparty exposures, and management believes that the probability of any payments under these arrangements is low.

Discover Network Merchant Chargeback Guarantees

The Company operates the Discover Network, issues payment cards and permits third parties to issue payment cards. The Company is contingently liable for certain transactions processed on the Discover Network in the event of a dispute between the payment card customer and a merchant. The contingent liability arises if the disputed transaction involves a merchant or merchant acquirer with whom the Discover Network has a direct relationship. If a dispute is resolved in the

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customer’s favor, the Discover Network will credit or refund the disputed amount to the Discover Network card issuer, who in turn credits its customer’s account. The Discover Network will then charge back the disputed amount of the payment card transaction to the merchant or merchant acquirer, where permitted by the applicable agreement, to seek recovery of amounts already paid to the merchant for payment card transactions. If the Discover Network is unable to collect the amount subject to dispute from the merchant or merchant acquirer (e.g., in the event of merchant default or dissolution or after expiration of the time period for chargebacks in the applicable agreement), the Discover Network will bear the loss for the amount credited or refunded to the customer. In most instances, a loss by the Discover Network is unlikely to arise in connection with payments on card transactions because most products or services are delivered when purchased and credits are issued by merchants on returned items in a timely fashion, thus minimizing the likelihood of cardholder disputes with respect to amounts paid by the Discover Network. However, where the product or service is not scheduled to be provided to the customer until a later date following the purchase, the likelihood of a contingent payment obligation by the Discover Network increases. Losses related to merchant chargebacks were not material for the three and six months ended June 30, 2017 and 2016.

The maximum potential amount of obligations of the Discover Network arising as a result of such contingent obligations is estimated to be the portion of the total Discover Network transaction volume processed to date for which timely and valid disputes may be raised under applicable law and relevant issuer and customer agreements. There is no limitation on the maximum amount the Company may be liable to pay to issuers. However, the Company believes that such amount is not representative of the Company’s actual potential loss exposure based on the Company’s historical experience. The actual amount of the potential exposure cannot be quantified as the Company cannot determine whether the current or cumulative transaction volumes may include or result in disputed transactions.

The table below summarizes certain information regarding merchant chargeback guarantees (in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Aggregate sales transaction volume(1)	$	35,885	$	34,634	$	68,539	$	65,915

(1) Represents period transactions processed on the Discover Network for which a potential liability exists that, in aggregate, can differ from credit card sales volume.

The Company did not record any contingent liability in the condensed consolidated financial statements for merchant chargeback guarantees as of June 30, 2017 or December 31, 2016. The Company mitigates the risk of potential loss exposure by withholding settlement from merchants, obtaining third-party guarantees, or obtaining escrow deposits or letters of credit from certain merchant acquirers or merchants that are considered higher risk due to various factors such as time delays in the delivery of products or services. As of June 30, 2017 and December 31, 2016, the Company had escrow deposits and settlement withholdings of $7 million and $9 million, respectively, which are recorded in interest-bearing deposit accounts and accrued expenses and other liabilities on the Company's condenses consolidated statements of financial condition.

12. Litigation and Regulatory Matters

In the normal course of business, from time to time, the Company has been named as a defendant in various legal actions, including arbitrations, class actions and other litigation, arising in connection with its activities. Certain of the actual or threatened legal actions include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. The litigation process is not predictable and can lead to unexpected results. The Company contests liability and/or the amount of damages as appropriate in each pending matter.

The Company has historically relied on the arbitration clause in its customer agreements, which has in some instances limited the costs of, and the Company’s exposure to, litigation, but there can be no assurance that the Company will continue to be successful in enforcing its arbitration clause in the future. Legal and regulatory challenges and prohibitions may also cause the Company to discontinue use of such clauses. From time to time, the Company is involved in legal actions challenging its arbitration clause. Bills are periodically introduced in Congress to directly or indirectly prohibit the use of pre-dispute arbitration clauses. The Dodd-Frank Wall Street Reform and Consumer Protection Act authorized the Consumer Financial Protection Bureau (the "CFPB") to conduct a study on pre-dispute arbitration clauses and, based on the study, potentially limit or ban arbitration clauses. On July 10, 2017, the CFPB issued a final arbitration rule that would (i) effectively ban consumer financial companies from including class action waivers in arbitration clauses, and (ii) require records of arbitrations to be provided to the CFPB for publication on its website. The final rule will become effective 60 days after its publication in the Federal Register, and applies to customer agreements entered into 180 days after its effective date. The Company is currently assessing the impact of the final rule, but believes that, subject to certain exceptions, it will generally not apply to arbitration clauses the Company already has in place with its existing customer base. The final rule

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may be subject to a variety of legal and other challenges including by Congress, through private litigation and other means, which may limit or even eliminate the rule.

The Company is also involved, from time to time, in other reviews, investigations and proceedings (both formal and informal) by governmental agencies regarding the Company’s business including, among other matters, consumer regulatory, accounting, tax and other operational matters, some of which may result in significant adverse judgments, settlements, fines, penalties, injunctions, decreases in regulatory ratings, customer restitution or other relief, which could materially impact the Company's condensed consolidated financial statements, increase its cost of operations, or limit its ability to execute its business strategies and engage in certain business activities. For example, Discover Bank and Discover Financial Services have been the subject of actions by the FDIC and the Federal Reserve, respectively, with respect to anti-money laundering and related compliance programs as described more fully below. In addition, certain subsidiaries of the Company are subject to a consent order with the CFPB regarding certain student loan servicing practices, as described below. Regulatory actions generally can include demands for civil money penalties, changes to certain business practices and customer restitution. Supervisory actions related to anti-money laundering and related laws and regulations will limit for a period of time the Company's ability to enter into certain types of acquisitions and make certain types of investments.

In accordance with applicable accounting guidance, the Company establishes an accrued liability for legal and regulatory matters when those matters present loss contingencies which are both probable and estimable. Litigation and regulatory settlement related expense was not material for the three and six months ended June 30, 2017 and 2016.

There may be an exposure to loss in excess of any amounts accrued. The Company believes the estimate of the aggregate range of reasonably possible losses (meaning those losses the likelihood of which is more than remote but less than likely) in excess of the amounts that the Company has accrued for legal and regulatory proceedings is up to $150 million. This estimated range of reasonably possible losses is based upon currently available information for those proceedings in which the Company is involved, takes into account the Company’s best estimate of such losses for those matters for which an estimate can be made, and does not represent the Company’s maximum potential loss exposure. Various aspects of the legal proceedings underlying the estimated range will change from time to time and actual results may vary significantly from the estimate.

The Company’s estimated range above involves significant judgment, given the varying stages of the proceedings, the existence of numerous yet to be resolved issues, the breadth of the claims (often spanning multiple years and, in some cases, a wide range of business activities), unspecified damages and/or the novelty of the legal issues presented. The outcome of pending matters could be material to the Company’s condensed consolidated financial condition, operating results and cash flows for a particular future period, depending on, among other things, the level of the Company’s income for such period, and could adversely affect the Company’s reputation.

On July 5, 2012, the Antitrust Division of the United States Department of Justice (the “Division”) issued a Civil Investigative Demand ("CID") to the Company seeking information regarding an investigation related to potential violations of Sections 1 and 2 of the Sherman Act, 15 U.S.C. §§1-2, by an unidentified party other than Discover. The CID seeks documents, data and narrative responses to several interrogatories and document requests, related to the debit card market. A CID is a request for information in the course of a civil investigation and does not constitute the commencement of legal proceedings. The Division is permitted by statute to issue a CID to anyone whom it believes may have information relevant to an investigation. The receipt of a CID does not presuppose that there is probable cause to believe that a violation of the antitrust laws has occurred or that a formal complaint ultimately will be filed. The Company is cooperating with the Division in connection with the CID.

On May 26, 2015, the Company entered into a written agreement with the Federal Reserve Bank of Chicago where the Company agreed to enhance the Company’s enterprise-wide anti-money laundering and related compliance programs. The agreement does not include civil money penalties. This agreement follows the consent order that Discover Bank entered into with the FDIC on June 13, 2014 related to Discover Bank’s anti-money laundering and related compliance programs. In the consent order, Discover Bank agreed to, among other things, enhance its anti-money laundering and related compliance programs.

On July 9, 2015, a class action lawsuit was filed against the Company in the U.S. District Court for the Northern District of Illinois (Polly Hansen v. Discover Financial Services and Discover Home Loans, Inc.). The plaintiff alleges that the Company contacted her, and members of the class she seeks to represent, on their cellular and residential telephones without their express consent or after consent was revoked in violation of the Telephone Consumer Protection Act ("TCPA"). Plaintiff seeks statutory damages for alleged negligent and willful violations of the TCPA, attorneys' fees, costs and

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injunctive relief. The TCPA provides for statutory damages of $500 for each violation ($1,500 for willful violations). On March 9, 2016, Sumner Davenport was substituted as lead plaintiff for Polly Hansen. On January 13, 2017, plaintiff filed an unopposed motion for preliminary approval of a class action settlement to resolve the case. On January 20, 2017, the Court granted preliminary approval of the settlement. The final approval hearing is scheduled for September 14, 2017. If approved, the case will be dismissed with prejudice as to all certified class members who do not opt out of the settlement.

On July 22, 2015, the Company announced that its subsidiaries, Discover Bank, The Student Loan Corporation and Discover Products Inc. (the “Discover Subsidiaries”), agreed to a consent order with the CFPB resolving the agency’s investigation with respect to certain student loan servicing practices. The CFPB’s investigation into these practices has been previously disclosed by the Company, initially in February 2014. The order required the Discover Subsidiaries to provide redress of approximately $16 million to consumers who may have been affected by the activities described in the order related to certain collection calls, overstatements of minimum payment due amounts in billing statements, and provision of interest paid information to consumers, and provide regulatory disclosures with respect to loans acquired in default. In addition, the Discover Subsidiaries were required to pay a $2.5 million civil money penalty to the CFPB. As required by the consent order, on October 19, 2015, the Discover Subsidiaries submitted to the CFPB a redress plan and a compliance plan designed to ensure that the Discover Subsidiaries provide redress and otherwise comply with the terms of the order.

On September 4, 2015, the District Attorney of Trinity County, California filed a protection products lawsuit against the Company in California state court (The People of the State of California Ex Rel, Eric L. Heryford, District Attorney, Trinity County v. Discover Financial Services, et al.). The District Attorney subsequently dismissed this lawsuit on February 19, 2016 and filed a new complaint in federal court in the Eastern District of California on March 4, 2016 alleging the same cause of action. An amended complaint was filed on March 25, 2016. The lawsuit asserts various claims under California's Unfair Competition Law with respect to the Company's marketing and administration of various protection products. Plaintiff seeks declaratory relief, statutory civil penalties, and attorneys’ fees. The Company filed a motion to dismiss the first amended complaint on April 26, 2016. The Company is not in a position at this time to assess the likely outcome or its exposure, if any, with respect to this matter, but will seek to vigorously defend against all claims asserted by the plaintiff.

On March 8, 2016, a class action lawsuit was filed against the Company, other credit card networks, other issuing banks, and EMVCo in the U.S. District Court for the Northern District of California (B&R Supermarket, Inc., d/b/a Milam’s Market, et al. v. Visa, Inc. et al.) alleging violations of the Sherman Antitrust Act, California's Cartwright Act, and unjust enrichment. Plaintiffs allege a conspiracy by defendants to shift fraud liability to merchants with the migration to the EMV security standard and chip technology. Plaintiffs assert joint and several liability among the defendants and seek unspecified damages, including treble damages, attorneys' fees, costs and injunctive relief. On July 15, 2016, plaintiffs filed an amended complaint that includes additional named plaintiffs, reasserts the original claims, and includes additional state law causes of action. The defendants filed motions to dismiss on August 5, 2016. On September 30, 2016, the court granted the motions to dismiss for certain issuing banks and EMVCo but denied the motions to dismiss filed by the networks, including the Company. Discovery is proceeding and class certification is fully briefed but the court did not rule on certification before it entered an order in May 2017 transferring the entire action to a federal court in New York that is presiding over certain related claims that are pending in the actions consolidated as MDL 1720. In June 2017, the federal court in New York declined to consolidate the B&R case with MDL 1720, but ordered the parties to coordinate discovery across the actions to the extent they involved related issues. On July 6, 2017, the Company requested permission to file a motion to dismiss the claims against it in the federal court in New York. A ruling on that request is expected on or before the August 24, 2017 status conference in which the Court is expected to set a schedule for remaining discovery and further proceedings on class certification. The Company is not in a position at this time to assess the likely outcome or its exposure, if any, with respect to this matter, but will seek to vigorously defend against all claims asserted by the plaintiffs.

13. Fair Value Measurements and Disclosures

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820, Fair Value Measurement, provides a three-level hierarchy for classifying financial instruments, which is based on whether the inputs to the valuation techniques used to measure the fair value of each financial instrument are observable or unobservable. It also requires certain disclosures about those measurements. The three-level valuation hierarchy is as follows:

• Level 1: Fair values determined by Level 1 inputs are defined as those that utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access.

• Level 2: Fair values determined by Level 2 inputs are those that utilize inputs other than quoted prices included in

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Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar assets and liabilities in active or inactive markets, quoted prices for the identical assets in an inactive market, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals. The Company evaluates factors such as the frequency of transactions, the size of the bid-ask spread and the significance of adjustments made when considering transactions involving similar assets or liabilities to assess the relevance of those observed prices. If relevant and observable prices are available, the fair values of the related assets or liabilities would be classified as Level 2.

• Level 3: Fair values determined by Level 3 inputs are those based on unobservable inputs and include situations where there is little, if any, market activity for the asset or liability being valued. In instances in which the inputs used to measure fair value may fall into different levels of the fair value hierarchy, the level in the fair value hierarchy within which the fair value measurement in its entirety is classified is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company may utilize both observable and unobservable inputs in determining the fair values of financial instruments classified within the Level 3 category.

The determination of classification of its financial instruments within the fair value hierarchy is performed at least quarterly by the Company. For transfers in and out of the levels of the fair value hierarchy, the Company discloses the fair value measurement based on the value immediately preceding the transfer.

The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and involves consideration of factors specific to the asset or liability. Furthermore, certain techniques used to measure fair value involve some degree of judgment and, as a result, are not necessarily indicative of the amounts the Company would realize in a current market exchange.

During the six months ended June 30, 2017, there were no changes to the Company's valuation techniques that had, or are expected to have, a material impact on the Company's condensed consolidated financial position or results of operations.

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Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are as follows (dollars in millions):
	Quoted Price in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs  (Level 2)		Significant Unobservable Inputs  (Level 3)		Total
Balance at June 30, 2017
Assets
U.S. Treasury securities	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		827		—		827
Available-for-sale investment securities	$	672	$	827	$	—	$	1,499
Derivative financial instruments(1)	$	—	$	5	$	—	$	5
Liabilities
Derivative financial instruments(1)	$	—	$	13	$	—	$	13
Balance at December 31, 2016
Assets
U.S. Treasury securities	$	674	$	—	$	—	$	674
Residential mortgage-backed securities - Agency	—		931		—		931
Available-for-sale investment securities	$	674	$	931	$	—	$	1,605
Derivative financial instruments	$	—	$	7	$	—	$	7
Liabilities
Derivative financial instruments	$	—	$	94	$	—	$	94

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. See Note 14: Derivatives and Hedging Activities for additional information.

There were no transfers between Levels 1 and 2 within the fair value hierarchy for the three or six months ended June 30, 2017 and 2016.

Available-for-Sale Investment Securities

Investment securities classified as available-for-sale consist of U.S. Treasury securities and residential mortgage-backed securities. The fair value estimates of investment securities classified as Level 1, consisting of U.S. Treasury securities, are determined based on quoted market prices for the same securities. The Company classifies residential mortgage-backed securities as Level 2, the fair value estimates of which are based on the best information available. This data may consist of observed market prices, broker quotes or discounted cash flow models that incorporate assumptions such as benchmark yields, issuer spreads, prepayment speeds, credit ratings and losses, the priority of which may vary based on availability of information.

The Company validates the fair value estimates provided by the pricing services primarily by comparison to valuations obtained through other pricing sources. The Company evaluates pricing variances amongst different pricing sources to ensure that the valuations utilized are reasonable. The Company also corroborates the reasonableness of the fair value estimates with analysis of trends of significant inputs, such as market interest rate curves. The Company further performs due diligence in understanding the procedures and techniques performed by the pricing services to derive fair value estimates.

At June 30, 2017, amounts reported in residential mortgage-backed securities reflect government-rated obligations issued by Fannie Mae, Freddie Mac and Ginnie Mae with a par value of $808 million, a weighted-average coupon of 2.81% and a weighted-average remaining maturity of three years.

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Derivative Financial Instruments

The Company's derivative financial instruments consist of interest rate swaps and foreign exchange forward contracts. These instruments are classified as Level 2 as their fair values are estimated using proprietary pricing models, containing certain assumptions based on readily observable market-based inputs, including interest rate curves, option volatility and foreign currency forward and spot rates. In determining fair values, the pricing models use widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity and the observable market-based inputs. The fair values of the interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments are based on an expectation of future interest rates derived from the observable market interest rate curves. The Company considers collateral and master netting agreements that mitigate credit exposure to counterparties in determining the counterparty credit risk valuation adjustment. The fair values of the currency instruments are valued comparing the contracted forward exchange rate pertaining to the specific contract maturities to the current market exchange rate.

The Company validates the fair value estimates of interest rate swaps primarily through comparison to the fair value estimates computed by the counterparties to each of the derivative transactions. The Company evaluates pricing variances amongst different pricing sources to ensure that the valuations utilized are reasonable. The Company also corroborates the reasonableness of the fair value estimates with analysis of trends of significant inputs, such as market interest rate curves. The Company performs due diligence in understanding the impact to any changes to the valuation techniques performed by proprietary pricing models prior to implementation, working closely with the third-party valuation service, and reviews the control objectives of the service at least annually. The Company corroborates the fair value of foreign exchange forward contracts through independent calculation of the fair value estimates.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The Company also has assets that under certain conditions are subject to measurement at fair value on a non-recurring basis. These assets include those associated with acquired businesses, including goodwill and other intangible assets. For these assets, measurement at fair value in periods subsequent to the initial recognition of the assets is applicable if one or more of the assets is determined to be impaired. During the three and six months ended June 30, 2017 and 2016, the Company had no material impairments related to these assets.

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Financial Instruments Measured at Other Than Fair Value

The following tables disclose the estimated fair value of the Company's financial assets and financial liabilities that are not required to be carried at fair value (dollars in millions):
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Carrying Value
Balance at June 30, 2017
Assets
States and political subdivisions of states	$	—	$	1	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		179		—		179		179
Held-to-maturity investment securities	$	—	$	180	$	—	$	180	$	180
Cash and cash equivalents	$	12,950	$	—	$	—	$	12,950	$	12,950
Restricted cash	$	93	$	—	$	—	$	93	$	93
Net loan receivables	$	—	$	—	$	78,819	$	78,819	$	75,613
Accrued interest receivables	$	—	$	746	$	—	$	746	$	746
Liabilities
Deposits	$	—	$	53,024	$	—	$	53,024	$	52,864
Long-term borrowings - owed to securitization investors	$	—	$	16,127	$	743	$	16,870	$	16,738
Other long-term borrowings	$	—	$	10,222	$	—	$	10,222	$	9,700
Accrued interest payables	$	—	$	191	$	—	$	191	$	191
Balance at December 31, 2016
Assets
States and political subdivisions of states	$	—	$	2	$	—	$	2	$	2
Residential mortgage-backed securities - Agency	—		150		—		150		150
Held-to-maturity investment securities	$	—	$	152	$	—	$	152	$	152
Cash and cash equivalents	$	11,914	$	—	$	—	$	11,914	$	11,914
Restricted cash	$	95	$	—	$	—	$	95	$	95
Net loan receivables	$	—	$	—	$	78,252	$	78,252	$	75,087
Accrued interest receivables	$	—	$	724	$	—	$	724	$	724
Liabilities
Deposits	$	—	$	52,183	$	—	$	52,183	$	51,992
Long-term borrowings - owed to securitization investors	$	—	$	15,617	$	900	$	16,517	$	16,411
Other long-term borrowings	$	—	$	9,470	$	—	$	9,470	$	9,032
Accrued interest payables	$	—	$	168	$	—	$	168	$	168

The fair values of these financial assets and liabilities, which are not carried at fair value on the condensed consolidated statements of financial condition, were determined by applying the fair value provisions discussed herein. The use of different assumptions or estimation techniques may have a material effect on these estimated fair value amounts. The following describes the valuation techniques of these financial instruments measured at other than fair value.

Cash and Cash Equivalents

The carrying value of cash and cash equivalents approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

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Restricted Cash

The carrying value of restricted cash approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

Held-to-Maturity Investment Securities

Held-to-maturity investment securities consist of residential mortgage-backed securities issued by agencies and municipal bonds. The fair value of residential mortgage-backed securities included in the held-to-maturity portfolio is estimated similarly to residential mortgage-backed securities carried at fair value on a recurring basis discussed herein. Municipal bonds are valued based on quoted market prices for the same or similar securities.

Net Loan Receivables

The Company's loan receivables are comprised of credit card and installment loans, including the PCI student loans. Fair value estimates are derived utilizing discounted cash flow analyses, the calculations of which are performed on groupings of loan receivables that are similar in terms of loan type and characteristics. Inputs to the cash flow analysis of each grouping consider recent prepayment trends and seasonality factors, if appropriate, as well as interest accrual estimates based on recent yields. The expected future cash flows, derived through the cash flow analysis, of each grouping are discounted at rates at which similar loans within each grouping could be originated under current market conditions. Significant inputs to the fair value measurement of the loan portfolio are unobservable and, as such, are classified as Level 3.

Accrued Interest Receivables

The carrying value of accrued interest receivables, which is included in other assets on the condensed consolidated statements of financial condition, approximates fair value as it is due in less than one year.

Deposits

The carrying values of money market deposits, savings deposits and demand deposits approximate fair value due to the potentially liquid nature of these deposits. For time deposits for which readily available market rates do not exist, fair values are estimated by discounting expected future cash flows using market rates currently offered for deposits with similar remaining maturities.

Long-Term Borrowings - Owed to Securitization Investors

Fair values of long-term borrowings owed to credit card securitization investors are determined utilizing quoted market prices of the same transactions and, as such, are classified as Level 2. Fair values of long-term borrowings owed to student loan securitization investors are calculated by discounting cash flows using estimated assumptions including, among other things, maturity and market discount rates. A portion of the difference between the carrying value and the fair value of the long-term borrowings owed to student loan securitization investors relates to purchase accounting adjustments recorded in connection with the December 2010 purchase of SLC. Significant inputs to these fair value measurements are unobservable and, as such, are classified as Level 3.

Other Long-Term Borrowings

Fair values of other long-term borrowings, consisting of subordinated and senior debt, are determined utilizing current observable market prices for those transactions and, as such, are classified as Level 2. A portion of the difference between the carrying value and the fair value of other long-term borrowings relates to the cash premiums paid in connection with the 2012 fiscal year debt exchanges.

Accrued Interest Payables

The carrying value of accrued interest payables, which is included in accrued expenses and other liabilities on the condensed consolidated statements of financial condition, approximates fair value as it is payable in less than one year.

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14. Derivatives and Hedging Activities

The Company uses derivatives to manage its exposure to various financial risks. The Company does not enter into derivatives for trading or speculative purposes. Certain derivatives used to manage the Company’s exposure to interest rate movements and other identified risks are not designated as hedges and do not qualify for hedge accounting.

Derivatives may give rise to counterparty credit risk, which generally is addressed through collateral arrangements as described under the sub-heading "— Collateral Requirements and Credit-Risk Related Contingency Features." The Company enters into derivative transactions with established dealers that meet minimum credit criteria established by the Company. All counterparties must be pre-approved prior to engaging in any transaction with the Company. Counterparties are monitored on a regular basis by the Company to ensure compliance with the Company’s risk policies and limits. In determining the counterparty credit risk valuation adjustment for the fair values of derivatives, the Company considers collateral and legally enforceable master netting agreements that mitigate credit exposure to related counterparties.

All derivatives are recorded in other assets at their gross positive fair values and in accrued expenses and other liabilities at their gross negative fair values. See Note 13: Fair Value Measurements and Disclosures for a description of the valuation methodologies of derivatives. Cash collateral posted and held balances are recorded in other assets and deposits, respectively, in the condensed consolidated statements of financial condition. Collateral amounts recorded in the condensed consolidated statements of financial condition are based on the net collateral posted or held position for each applicable legal entity's master netting arrangement with each counterparty. Effective in the first quarter of 2017, certain cash collateral amounts associated with derivative positions that are cleared through an exchange are now legally characterized as settlement of the derivative positions. This change results in such collateral amounts being reflected as offsets to the associated derivatives balances recorded in other assets or in accrued expenses and other liabilities, instead of as collateral in other assets or deposits. There is no change to the presentation in the condensed consolidated statements of financial condition of collateral related to positions that are not cleared through an exchange.

Derivatives Designated as Hedges

Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows arising from changes in interest rates, or other types of forecasted transactions, are considered cash flow hedges. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges.

Cash Flow Hedges

The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on credit card securitized debt and deposits. The Company's outstanding cash flow hedges are for an initial maximum period of seven years for securitized debt and deposits. The derivatives are designated as hedges of the risk of changes in cash flows on the Company's LIBOR or Federal Funds rate-based interest payments, and qualify for hedge accounting in accordance with ASC Topic 815, Derivatives and Hedging (“ASC 815”).

The effective portion of the change in the fair value of derivatives designated as cash flow hedges is recorded in OCI and is subsequently reclassified into earnings in the period that the hedged forecasted cash flows affect earnings. The ineffective portion of the change in fair value of the derivative, if any, is recognized directly in earnings. Amounts reported in AOCI related to derivatives at June 30, 2017 will be reclassified to interest expense as interest payments are made on certain of the Company's floating-rate securitized debt or deposits. During the next 12 months, the Company estimates it will reclassify $9 million of pretax losses to interest expense related to its derivatives designated as cash flow hedges.

Fair Value Hedges

The Company is exposed to changes in fair value of certain of its fixed-rate debt obligations due to changes in interest rates. The Company uses interest rate swaps to manage its exposure to changes in fair value of certain fixed-rate senior notes, securitized debt, bank notes and interest-bearing brokered deposits attributable to changes in LIBOR, a benchmark interest rate as defined by ASC 815. These interest rate swaps qualify as fair value hedges in accordance with ASC 815. Changes in both (i) the fair values of the derivatives and (ii) the hedged fixed-rate senior notes, securitized debt, bank notes and interest-bearing brokered deposits relating to the risk being hedged are recorded in interest expense. The changes generally provide substantial offset to one another, with any difference, or ineffectiveness recorded in interest expense. Any basis differences between the fair value and the carrying amount of the hedged item at the inception of the hedging relationship are amortized to interest expense.

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Derivatives Not Designated as Hedges

Foreign Exchange Forward Contracts

The Company has foreign exchange forward contracts that are economic hedges and are not designated as accounting hedges. The Company enters into foreign exchange forward contracts to manage foreign currency risk. Changes in the fair value of these contracts are recorded in other income.

Derivatives Cleared Through an Exchange

Effective January 3, 2017, the Chicago Mercantile Exchange ("CME") changed the legal characterization of cash variation margin payments on derivatives cleared through its exchange as "settlements" rather than as "collateral". The Company currently utilizes only CME for all cleared transactions. The International Swaps and Derivatives Association ("ISDA") outlined their conclusions regarding the impact of the change, stating that variation margin payments that are legally considered settlement payments should be accounted for with corresponding derivative positions as one unit of account and should no longer be accounted for separately as collateral. The Securities and Exchange Commission staff did not object to the ISDA’s conclusions. The results of the change are reflected in the table below for the current period. With settlement payments on derivative positions cleared through the CME reflected as offsets to the associated derivative asset and liability balances, the fair values of derivative instruments and collateral balances shown are generally reduced. At June 30, 2017, the change resulted in a decrease of $64 million in both derivative assets/liabilities and collateral posted on the condensed consolidated statements of financial condition.

Derivatives Activity

The following table summarizes the fair value (including accrued interest) and outstanding notional amounts of derivative instruments and related collateral balances (dollars in millions):
	June 30, 2017									December 31, 2016
	Notional Amount		Number of Outstanding Derivative Contracts	Derivative Assets			Derivative Liabilities			Notional Amount		Derivative Assets			Derivative Liabilities
Derivatives designated as hedges
Interest rate swaps—cash flow hedge(1)	$	3,800	7	$	3		$	9		$	3,700	$	—		$	22
Interest rate swaps—fair value hedge(1)	$	5,645	31	2			4			$	6,208	7			72
Derivatives not designated as hedges
Foreign exchange forward contracts(2)	$	12	6	—			—			$	13	—			—
Interest rate swap	$	—	—	—			—			$	149	—			—
Total gross derivative assets/liabilities(3)				5			13					7			94
Less: Collateral held/posted(4)				(1		)	(13		)			(2		)	(94		)
Total net derivative assets/liabilities				$	4		$	—				$	5		$	—

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. The affected contracts remain term instruments and are reflected in notional amounts and number of outstanding derivative contracts.

(2) The foreign exchange forward contracts have notional amounts of EUR 7 million, GBP 2 million and SGD 1 million as of June 30, 2017 and notional amounts of EUR 6 million, GBP 5 million and SGD 1 million as of December 31, 2016.

(3) In addition to the derivatives disclosed in the table, the Company enters into forward contracts to purchase when-issued mortgage-backed securities as part of its community reinvestment initiatives. At June 30, 2017, the Company had one outstanding contract with a notional amount of $2 million and immaterial fair value. At December 31, 2016, the Company had one outstanding contract with a notional amount of $36 million and immaterial fair value.

(4) Collateral amounts, which consist of both cash and investment securities, are limited to the related derivative asset/liability balance and do not include excess collateral received/pledged. Effective in the first quarter of 2017, collateral held/posted excludes amounts that are recorded as offsets to the associated derivative asset or derivative liability balances.

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The following tables summarize the impact of the derivative instruments on income and OCI and indicates where within the condensed consolidated financial statements such impact is reported (dollars in millions):
		Amount of Gain (Loss) Recognized in OCI
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow/net investment hedges
Total gain (loss) recognized in OCI after amounts reclassified into earnings, pre-tax	OCI	$	8		$	(10	)	$	19		$	(53	)
Total gain (loss) recognized in OCI		$	8		$	(10	)	$	19		$	(53	)
		Amount of (Loss) Gain Recognized in Income
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow hedges
Amount reclassified from OCI into income	Interest Expense	$	(3	)	$	(9	)	$	(8	)	$	(18	)
Total amount reclassified from OCI into income on cash flow hedges		(3		)	(9		)	(8		)	(18		)
Interest rate swaps - fair value hedges
Gain (loss) on interest rate swaps		13			13			(3		)	44
(Loss) Gain on hedged items		(12		)	(13		)	4			(44		)
Net ineffectiveness gain	Interest Expense	1			—			1			—
Increase to interest expense related to net settlements on interest rate swaps	Interest Expense	2			8			8			17
Total gain on fair value hedges		3			8			9			17
Total gain (loss) on derivatives designated as hedges recognized in income		$	—		$	(1	)	$	1		$	(1	)
Derivatives not designated as hedges
Total (loss) gain on derivatives not designated as hedges recognized in income	Other Income	$	(1	)	$	1		$	(1	)	$	—

Collateral Requirements and Credit-Risk Related Contingency Features

The Company has master netting arrangements and minimum collateral posting thresholds with its counterparties for its fair value and cash flow hedge interest rate swaps and foreign exchange forward contracts. The Company has not sought a legal opinion in relation to the enforceability of its master netting arrangements and, as such, does not report any of these positions on a net basis.Collateral is required by either the Company or its subsidiaries or the counterparty depending on the net fair value position of these derivatives held with that counterparty. The Company may also be required to post collateral with a counterparty for its fair value and cash flow hedge interest rate swaps depending on the credit rating it or Discover Bank receives from specified major credit rating agencies. Collateral receivable or payable amounts are generally not offset against the fair value of these derivatives, but are recorded separately in other assets or deposits. However, effective in the first quarter of 2017, certain cash collateral amounts related to positions cleared through an exchange are reflected as offsets to the associated derivatives balances recorded in other assets and accrued expenses and other liabilities.

At June 30, 2017, Discover Bank’s credit rating met specified thresholds set by its counterparties. However, if its credit rating is reduced by one rating notch, Discover Bank would be required to post additional collateral. The amount of

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additional collateral as of June 30, 2017 would have been $38 million. DFS (Parent Company) had no outstanding derivatives as of June 30, 2017, therefore, no collateral was required.

The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations.

15. Segment Disclosures

The Company’s business activities are managed in two segments: Direct Banking and Payment Services.

• Direct Banking: The Direct Banking segment includes Discover-branded credit cards issued to individuals on the Discover Network and other consumer products and services, including private student loans, personal loans, home equity loans, and other consumer lending and deposit products. The majority of Direct Banking revenues relate to interest income earned on the segment's loan products. Additionally, the Company’s credit card products generate substantially all revenues related to discount and interchange, protection products and loan fee income.

• Payment Services: The Payment Services segment includes PULSE, an automated teller machine, debit and electronic funds transfer network; Diners Club, a global payments network; and the Company’s Network Partners business, which provides payment transaction processing and settlement services on the Discover Network. The majority of Payment Services revenues relate to transaction processing revenue from PULSE and royalty and licensee revenue from Diners Club.

The business segment reporting provided to and used by the Company’s chief operating decision maker is prepared using the following principles and allocation conventions:

• The Company aggregates operating segments when determining reportable segments.

• Corporate overhead is not allocated between segments; all corporate overhead is included in the Direct Banking segment.

• Through its operation of the Discover Network, the Direct Banking segment incurs fixed marketing, servicing and infrastructure costs that are not specifically allocated among the segments, with the exception of an allocation of direct and incremental costs driven by the Company's Payment Services segment.

• The assets of the Company are not allocated among the operating segments in the information reviewed by the Company’s chief operating decision maker.

• The revenues of each segment are derived from external sources. The segments do not earn revenue from intercompany sources.

• Income taxes are not specifically allocated between the operating segments in the information reviewed by the Company’s chief operating decision maker.

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The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services		Total
For the Three Months Ended June 30, 2017
Interest income
Credit card loans	$	1,916	$	—	$	1,916
Private student loans	127		—		127
PCI student loans	41		—		41
Personal loans	207		—		207
Other	47		—		47
Total interest income	2,338		—		2,338
Interest expense	400		—		400
Net interest income	1,938		—		1,938
Provision for loan losses	639		1		640
Other income	408		73		481
Other expense	876		36		912
Income before income tax expense	$	831	$	36	$	867
For the Three Months Ended June 30, 2016
Interest income
Credit card loans	$	1,734	$	—	$	1,734
Private student loans	110		—		110
PCI student loans	47		—		47
Personal loans	171		—		171
Other	28		—		28
Total interest income	2,090		—		2,090
Interest expense	339		—		339
Net interest income	1,751		—		1,751
Provision for loan losses	411		1		412
Other income	396		69		465
Other expense	868		38		906
Income before income tax expense	$	868	$	30	$	898

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The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services			Total
For the Six Months Ended June 30, 2017
Interest income
Credit card loans	$	3,792	$	—		$	3,792
Private student loans	251		—			251
PCI student loans	82		—			82
Personal loans	405		—			405
Other	86		—			86
Total interest income	4,616		—			4,616
Interest expense	786		—			786
Net interest income	3,830		—			3,830
Provision for loan losses	1,233		(7		)	1,226
Other income	783		145			928
Other expense	1,725		72			1,797
Income before income tax expense	$	1,655	$	80		$	1,735
For the Six Months Ended June 30, 2016
Interest income
Credit card loans	$	3,467	$	—		$	3,467
Private student loans	217		—			217
PCI student loans	96		—			96
Personal loans	338		—			338
Other	56		—			56
Total interest income	4,174		—			4,174
Interest expense	673		—			673
Net interest income	3,501		—			3,501
Provision for loan losses	834		2			836
Other income	802		137			939
Other expense	1,719		73			1,792
Income before income tax expense	$	1,750	$	62		$	1,812

16. Subsequent Events

The Company has evaluated events and transactions that have occurred subsequent to June 30, 2017 and determined that there were no subsequent events that would require recognition or disclosure in the condensed consolidated financial statements.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our condensed consolidated financial statements and related notes included elsewhere in this quarterly report. This quarterly report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements, which speak to our expected business and financial performance, among other matters, contain words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “aim,” “will,” “may,” “should,” “could,” “would,” “likely,” and similar expressions. Such statements are based upon the current beliefs and expectations of our management and are subject to significant risks and uncertainties. Actual results may differ materially from those set forth in the forward-looking statements. These forward-looking statements speak only as of the date of this quarterly report, and there is no undertaking to update or revise them as more information becomes available.

The following factors, among others, could cause actual results to differ materially from those set forth in the forward-looking statements: changes in economic variables, such as the availability of consumer credit, the housing market, energy costs, the number and size of personal bankruptcy filings, the rate of unemployment, the levels of consumer confidence and consumer debt and investor sentiment; the impact of current, pending and future legislation, regulation, supervisory guidance and regulatory and legal actions, including, but not limited to, those related to financial regulatory reform, consumer financial services practices, anti-corruption and funding, capital and liquidity; the actions and initiatives of current and potential competitors; our ability to manage our expenses; our ability to successfully achieve card acceptance across our networks and maintain relationships with network participants; our ability to sustain and grow our private student loan, personal loan and home equity loan products; losses as a result of mortgage loan repurchase and indemnification obligations to secondary market purchasers; difficulty obtaining regulatory approval for, financing, transitioning, integrating or managing the expenses of acquisitions of or investments in new businesses, products or technologies; our ability to manage our credit risk, market risk, liquidity risk, operational risk, legal and compliance risk and strategic risk; the availability and cost of funding and capital; access to deposit, securitization, equity, debt and credit markets; the impact of rating agency actions; the level and volatility of equity prices, commodity prices and interest rates, currency values, investments, other market fluctuations and other market indices; losses in our investment portfolio; limits on our ability to pay dividends and repurchase our common stock; limits on our ability to receive payments from our subsidiaries; fraudulent activities or material security breaches of key systems; our ability to remain organizationally effective; our ability to increase or sustain Discover card usage or attract new customers; our ability to maintain relationships with merchants; the effect of political, economic and market conditions, geopolitical events and unforeseen or catastrophic events; our ability to introduce new products and services; our ability to manage our relationships with third-party vendors; our ability to maintain current technology and integrate new and acquired systems; our ability to collect amounts for disputed transactions from merchants and merchant acquirers; our ability to attract and retain employees; our ability to protect our reputation and our intellectual property; and new lawsuits, investigations or similar matters or unanticipated developments related to current matters. We routinely evaluate and may pursue acquisitions of or investments in businesses, products, technologies, loan portfolios or deposits, which may involve payment in cash or our debt or equity securities.

Additional factors that could cause our results to differ materially from those described below can be found in this section in this quarterly report and in “Risk Factors,” “Business—Competition,” “Business—Supervision and Regulation” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our annual report on Form 10-K for the year ended December 31, 2016, which is filed with the SEC and available at the SEC’s internet site (http://www.sec.gov).

Introduction and Overview

Discover Financial Services ("DFS") is a direct banking and payment services company. We provide direct banking products and services and payment services through our subsidiaries. We offer our customers credit card loans, private student loans, personal loans, home equity loans and deposit products. We also operate the Discover Network, the PULSE network (“PULSE”) and Diners Club International (“Diners Club”). The Discover Network processes transactions for Discover-branded credit cards and provides payment transaction processing and settlement services. PULSE operates an electronic funds transfer network, providing financial institutions issuing debit cards on the PULSE network with access to ATMs domestically and internationally, as well as point-of-sale terminals at retail locations throughout the U.S. for debit card transactions. Diners Club is a global payments network of licensees, which are generally financial institutions, that issue Diners Club branded charge cards and/or provide card acceptance services.

Our primary revenues consist of interest income earned on loan receivables and fees earned from customers, financial institutions, merchants and issuers. The primary expenses required to operate our business include funding costs (interest

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expense), loan loss provisions, customer rewards and expenses incurred to grow, manage and service our loan receivables and networks. Our business activities are funded primarily through consumer deposits, securitization of loan receivables and the issuance of unsecured debt.

Quarter Highlights

• Net income for the three months ended June 30, 2017 was $546 million compared to $616 million for the same period in 2016.

• Total loans grew $6.1 billion, or 8%, from June 30, 2016 to $78.0 billion.

• Credit card loans grew $4.6 billion, or 8%, to $61.8 billion, and Discover card sales volume increased 5% from June 30, 2016.

• Net charge-off rate excluding PCI loans increased 52 basis points from the prior year to 2.79% and the credit card delinquency rate for loans over 30 days past due increased 37 basis points from the prior year to 2.00%.

• Direct-to-consumer deposits grew $3.6 billion, or 11%, from the prior year to $37.7 billion.

• Payment Services transaction dollar volume for the segment was $50.1 billion, up 12% from the prior year.

• We received a non-objection to our 2017 Comprehensive Capital Analysis and Review ("CCAR") submission from the Federal Reserve.

Outlook

We plan on continuing to provide strong capital returns to shareholders and proceed to execute against our 2017 capital plan. This plan includes our recently increased quarterly dividend and share repurchase program. We will continue to invest in marketing and rewards to drive growth in our receivables, which we expect will result in higher interest income levels. Investments in marketing and infrastructure are expected to continue in the second half of 2017. We remain focused on utilizing our rewards programs to support growth, which is expected to result in a higher rewards rate year over year.

Along with expected loan growth, we expect net interest margin to increase slightly during the year, driven by our balance sheet positioning for anticipated interest rate increases. Our total charge-off rate is also expected to be higher in comparison to the prior year. We expect to add to the loan loss reserve to provide for the seasoning of recent loan growth and increasing consumer leverage.

In our payments segment, we continue to pursue new ways to drive volume growth while we expect competition to remain intense. We continue to leverage our network to support our card-issuing business.

Regulatory Environment and Developments

In recent years, federal banking regulators have implemented and continue to propose and finalize new regulations and supervisory guidance, including under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act"). Regulators have also increased their examination and enforcement action activities. The Dodd-Frank Act creates a framework for regulation of large systemically significant financial firms, including Discover, through a variety of measures, including increased capital and liquidity requirements and limits on leverage and enhanced supervisory authority. The Dodd-Frank Act contains comprehensive provisions governing the practices and oversight of financial institutions as well as other participants in the financial markets. We expect regulators to continue taking formal enforcement actions against financial institutions in addition to addressing concerns through non-public supervisory actions or findings. While the new Congress and Administration have expressed support for Dodd-Frank modifications that could reduce regulatory burdens through a variety of channels including executive action, rulemaking and legislation, prospects for the enactment of significant changes are uncertain.

The impact of the evolving regulatory environment on our business and operations depends upon a number of factors, including supervisory priorities and actions, our actions, those of our competitors and other marketplace participants, and the behavior of consumers. Regulatory developments, enforcement actions, findings and ratings could affect supervisory priorities, actions, and rule-making, as well as negatively impact our business strategies, require us to limit or change our business practices, limit our product offerings, invest more management time and resources in compliance efforts, limit the fees we can charge for services, limit our ability to pursue certain business opportunities and obtain related required regulatory approvals, or change how we compensate certain of our employees. For example, in 2016, federal banking

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regulators issued a proposed rulemaking on incentive compensation. Unlike the principles-based 2010 Interagency Guidance on Sound Incentive Compensation Policies, the proposed rule is prescriptive in nature and would require an extensive restructuring of incentive compensation practices for certain employees, including our executives. Any changes to our business or compensation structure arising out of this rule could impact our ability to attract, hire or retain certain personnel. The timing and substance of the final rule are unknown. For more information on recent matters affecting Discover, see Note 12: Litigation and Regulatory Matters to our condensed consolidated financial statements. Regulatory developments, enforcement actions, findings and ratings could also have an impact on our strategies, the value of our assets, or otherwise adversely affect our businesses.

As a result of the growing cybersecurity threat and the mounting number of incidents involving unauthorized access to consumer information, banking regulators and policymakers at the federal and state levels are increasingly focused on measures to enhance data security and incident response capabilities. The Federal Financial Institutions Examination Council recently revised examiner guidance for evaluating the adequacy of a financial institution's information security program and associated risk management practices. In addition, in October 2016, federal banking regulators issued an advanced notice of proposed rulemaking that provides for enhanced cyber risk management standards to increase the operational resilience of large financial services firms and reduce the systemic impact of a cybersecurity event. The timing and final form of any final rule is uncertain at this time. Legislation at various levels of government has also been proposed to address security breach notification. While it is too early to know their impact, these developments could ultimately result in the imposition of requirements on Discover and other card issuers or networks that could increase costs or adversely affect the competitiveness of our credit card or debit card products.

Compliance expenditures have increased significantly for Discover and other financial services firms, and we expect them to continue to increase as regulators remain focused on controls and operational processes. We may face additional compliance and regulatory risk to the extent that we enter into new business arrangements with third-party service providers, alternative payment providers or other industry participants. The additional expense, time and resources needed to comply with ongoing regulatory requirements may adversely impact our business and results of operations.

Consumer Financial Services

The Consumer Financial Protection Bureau (the "CFPB") regulates consumer financial products and services, as well as certain financial services providers, including Discover. The CFPB has rulemaking and interpretive authority under the Dodd-Frank Act and other federal consumer financial services laws, as well as broad supervisory, examination and enforcement authority over designated financial services providers. The CFPB’s regulatory authority includes the exercise of rulemaking, supervision and enforcement powers with respect to “unfair, deceptive or abusive acts or practices” and consumer access to fair, transparent and competitive financial products and services. The CFPB's policy priorities for 2017, as in recent years, include a focus on several financial products of the type we offer (e.g. credit cards and student loans).

The CFPB recently issued a final rule that will significantly limit the use of pre-dispute arbitration agreements and class action waivers. For more information, see Note 12: Litigation and Regulatory Matters to our condensed consolidated financial statements. 

In addition, the CFPB publishes regular Complaint Reports and Supervisory Highlights about specific products, services and practices. The CFPB also maintains an online consumer complaint portal that shows the nature of each consumer's complaint and the financial services provider's responses, such as whether the requested relief was provided. The complaint portal allows consumers' narratives of their complaints to be included, although the Bureau does not verify the accuracy of the narratives. On July 29, 2016 the CFPB proposed to replace the dispute function on the portal, whereby the customer can dispute a company’s response to the complaint, with a survey that will allow the customer to provide feedback on the financial services provider's handling of the complaint. The CFPB seeks to implement this survey in 2017. In addition to conducting regular examinations of regulated financial services providers the CFPB regularly collects account-level information about certain financial products (e.g. credit cards) from Discover and other large financial services providers. The CFPB's analysis of complaint and account-level data, together with its supervisory examinations, can inform future decisions about its regulatory and examination priorities and influence consumers' decisions about doing business with financial services providers.

Credit Cards

Pursuant to the CARD Act, the CFPB is conducting its bi-annual review of the consumer credit card market. The review may result in additional guidance for credit card issuers, regulatory changes or legislative recommendations to

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Congress. The cost and availability of credit, credit disclosures and consumer experience with debt collectors continue to be an area of focus of the CFPB. The CFPB may propose debt collection regulations that apply to our lending business in 2017. The CFPB is developing a comprehensive debt collection rule that is expected to address practices of both third party debt collectors, which are currently regulated under the Fair Debt Collection Practices Act, and creditors like Discover.

Private Student Loans

There continues to be legislative and regulatory focus on the private student loan market, including by the CFPB, the Federal Deposit Insurance Corporation (the "FDIC") and some state legislatures and state attorneys general. This regulatory focus has resulted in an increase in supervisory examinations of Discover related to private student loans. On July 22, 2015, the CFPB and Discover entered into a consent order pertaining to certain student loan servicing practices of Discover Bank, The Student Loan Corporation and Discover Products, Inc. See Note 12: Litigation and Regulatory Matters to our condensed consolidated financial statements for more information.

Recent areas of regulatory attention include servicing, payments and collection practices, originations at for-profit schools, and other matters. Student loan servicing laws were recently enacted in California and the District of Columbia, and several other similar bills are pending that would impose new licensing, servicing, reporting and regulatory oversight requirements on non-bank student loan servicers. The enactment of new legislation or the adoption of new regulations or guidance may increase the complexity and expense of servicing student loans. Legislators and regulators may take additional actions that impact the student loan market in the future, which could cause us to change our private student loan products or servicing practices in ways that we may not currently anticipate.

Mortgage Lending

The mortgage industry continues to be an area of supervisory focus and the CFPB has stated that it will concentrate its examinations on a variety of mortgage-related topics including steering consumers to less favorable products, discrimination, abusive or unfair lending practices, predatory lending, origination disclosures, minimum mortgage underwriting standards, mortgage loan origination compensation and servicing practices. The CFPB has recently published several final rules impacting the mortgage industry. For example, on August 4, 2016, the CFPB issued final rules that expand the obligations of servicers and resolve some ambiguities. These changes will generally take effect in 2017. The CFPB has also recently proposed changes to the rules for integrated mortgage origination disclosures. The timing and substance of a final rule is uncertain at this point.

Payment Networks

The Dodd-Frank Act contains several provisions impacting the debit card market, including network participation requirements and interchange fee limitations. The changing debit card environment, including competitor actions related to merchant and acquirer pricing and transaction routing strategies, has adversely affected, and is expected to continue to adversely affect, our PULSE network's business practices, network transaction volume, revenue and prospects for future growth. We continue to closely monitor competitor pricing strategies in order to assess their impact on our business and on competition in the marketplace. The U.S. Department of Justice is examining some of these competitor pricing strategies. In addition, PULSE filed a lawsuit against Visa in late 2014 with respect to these competitive concerns, which will significantly impact expenses for the payment services segment. In addition, the Dodd-Frank Act's network participation requirements impact PULSE's ability to enter into exclusivity arrangements, which affects PULSE's current business practices and may materially adversely affect its network transaction volume and revenue.

European interchange fee regulation entered into force in June 2015. The regulation, among other things, caps interchange fees of "four-party" networks such as Visa and MasterCard. However, the regulation provides that “three-party” networks should be treated as “four-party” networks when they license third-party providers to issue cards and/or acquire merchants or when they issue cards with a co-brand partner or through an agent. This means the caps apply to elements of the financial arrangements agreed to between Diners Club and each of our stand-alone acquirers in Western Europe. The caps took effect in December 2015. The regulation excludes commercial card transactions from the scope of the caps. The regulation also contains a number of business rules, which we have, to the extent applicable, implemented in our Diners Club business.

There are additional initiatives in Europe that may have an impact on our Diners Club business, including revisions to the Payment Services Directive ("PSD2") and the new General Data Protection Regulation ("GDPR"). The PSD2 was published in the Official Journal of the EU in December 2015. Each European Union member state will transpose the PSD2

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into its national law, and in January 2018 the PSD2 will enter into force. Among other terms, the PSD2 includes provisions that once transposed into local law will regulate surcharging and network access requirements, which may result in differential surcharging of Diners Club cards and may impact Diners Club licensing arrangements in Europe. The European Parliament's Civil Liberties, Justice and Home Affairs Committee approved the final draft of the GDPR in December 2015. The final GDPR was published in the Official Journal of the European Union on May 4, 2016. Organizations have two years to prepare before the legislation comes into force on May 25, 2018. We are preparing for implementation of the GDPR.

The Chinese State Council previously announced that foreign payments companies would be able to participate in the Chinese domestic market and be eligible to apply for a license to operate a Bank Card Clearing Institution ("BCCI") in China. In June 2016 the People’s Bank of China ("PBOC"), in conjunction with the China Banking Regulatory Commission, promulgated the Administrative Measures on BCCIs. On June 30, 2017, the PBOC published the implementation guidelines. We are analyzing any potential impact on our business and preparing for implementation.

Capital, Liquidity and Funding

Capital

Discover Financial Services and Discover Bank are subject to regulatory capital requirements that became effective January 1, 2015 under final rules issued by the Board of Governors of the Federal Reserve System (the "Federal Reserve")and the FDIC to implement the provisions under the Basel Committee’s December 2010 framework (referred to as “Basel III”). The final capital rules ("Basel III rules") require minimum risk-based capital and leverage ratios and define what constitutes capital for purposes of calculating those ratios. In addition, the Basel III rules establish a capital conservation buffer above the regulatory minimum capital requirements, which must consist entirely of Common Equity Tier 1 ("CET1") capital and result in higher required minimum ratios by up to 2.5%. The new capital conservation buffer requirement became effective on January 1, 2016; however, the buffer threshold amounts are subject to a gradual phase-in period. In 2016, the highest capital conservation buffer threshold was 0.625%, which has risen to 1.25% for the 2017 calendar year. The full 2.5% buffer requirement will not be fully phased-in until January 2019. A banking organization is subject to limitations on paying dividends, engaging in share repurchases and paying discretionary bonuses if its capital level falls below any of the minimum capital requirements, taking into account the applicable capital conservation buffer thresholds. Based on our current capital composition and levels and business plans, we are and expect to continue to be in compliance with the requirements for the foreseeable future. For additional information, see "— Liquidity and Capital Resources — Capital."

The Basel Committee has previously proposed revisions to its standardized approach to measuring credit risk for purposes of calculating regulatory capital requirements. The proposed revisions include a provision that would, for the first time, require banking organizations to include a percentage of “unconditionally cancellable commitments” in risk-weighted asset calculations. This change could require credit card issuers, such as Discover, to substantially increase the amount of capital they hold against unused credit card lines. If the Basel Committee were to adopt the revisions as proposed, they would become applicable to Discover only if implemented within the United States by the domestic federal bank regulatory agencies, and made applicable to all "Standardized Approach" banks. Those agencies have publicly acknowledged the Basel Committee’s proposals, indicating that the revisions “would apply primarily to large, internationally active banking organizations.”

Liquidity

We are subject to the Federal Reserve's final rule implementing certain enhanced prudential standards under the Dodd-Frank Act for large U.S. bank holding companies, including enhanced liquidity and risk management requirements, which became effective January 1, 2015. The final rule prescribes a broad range of qualitative liquidity risk management practices.

Additionally, we are subject to the U.S. liquidity coverage ratio rule issued by federal banking regulators in 2014, which became effective on January 1, 2016. This quantitative requirement is designed to promote the short-term resilience of the liquidity risk profile of large and internationally active banking organizations in the United States. The rule requires covered banks to maintain an amount of high-quality liquid assets sufficient to cover projected net cash outflows during a prospective 30-day calendar period under an acute, hypothetical liquidity stress scenario. Given our current asset size, we are subject to a modified liquidity coverage ratio requirement which requires a lower level of high-quality liquid assets to meet the minimum ratio requirement due to adjustments to the net cash outflow amount. Under the rule's transition period, we are required to maintain a liquidity ratio of 100% in 2017. As of June 30, 2017, our liquidity coverage ratio was in excess of the applicable regulatory requirement. On December 19, 2016, the Federal Reserve issued a final rule that will require banking institutions subject to the liquidity coverage ratio rule to publish quarterly public disclosures regarding the company’s

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liquidity risk profile and components of its liquidity coverage ratio calculation. Discover will be required to publish its first disclosure under the rule beginning the fourth quarter of 2018.

In April 2016, the federal banking agencies issued a notice of proposed rulemaking to implement, within the United States, the long-term liquidity standards previously issued at the international level by the Basel Committee on Banking Supervision. The proposed rule would impose a new quantitative liquidity requirement called the Net Stable Funding Ratio (“NSFR”) to ensure that covered banking organizations maintain stable funding to meet their funding needs over a one year time horizon. The NSFR is intended to complement the shorter-term liquidity coverage ratio requirement. Under the proposed rule, we would be subject to a less stringent “modified” NSFR requirement. If adopted as a final rule, the minimum NSFR requirements would take effect on January 1, 2018.

Segments

We manage our business activities in two segments: Direct Banking and Payment Services. In compiling the segment results that follow, our Direct Banking segment bears all corporate overhead costs that are not specifically associated with a particular segment and all costs associated with Discover Network marketing, servicing and infrastructure, with the exception of an allocation of direct and incremental costs driven by our Payment Services segment.

Direct Banking

Our Direct Banking segment includes Discover-branded credit cards issued to individuals on the Discover Network and other consumer products and services, including private student loans, personal loans, home equity loans, and other consumer lending and deposit products. The majority of Direct Banking revenues relate to interest income earned on the segment's loan products. Additionally, our credit card products generate substantially all of our revenues related to discount and interchange, protection products and loan fee income.

Payment Services

Our Payment Services segment includes PULSE, an automated teller machine, debit and electronic funds transfer network; Diners Club, a global payments network; and our Network Partners business, which provides payment transaction processing and settlement services on the Discover Network. The majority of Payment Services revenues relate to transaction processing revenue from PULSE and royalty and licensee revenue (included in other income) from Diners Club.

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The following table presents segment data (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017			2016
Direct Banking
Interest income
Credit card	$	1,916	$	1,734	$	3,792		$	3,467
Private student loans	127		110		251			217
PCI student loans	41		47		82			96
Personal loans	207		171		405			338
Other	47		28		86			56
Total interest income	2,338		2,090		4,616			4,174
Interest expense	400		339		786			673
Net interest income	1,938		1,751		3,830			3,501
Provision for loan losses	639		411		1,233			834
Other income	408		396		783			802
Other expense	876		868		1,725			1,719
Income before income tax expense	831		868		1,655			1,750
Payment Services
Provision for loan losses	1		1		(7		)	2
Other income	73		69		145			137
Other expense	36		38		72			73
Income before income tax expense	36		30		80			62
Total income before income tax expense	$	867	$	898	$	1,735		$	1,812

The following table presents information on transaction volume (in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Network Transaction Volume
PULSE Network	$	38,848	$	33,856	$	74,914	$	68,536
Network Partners	3,461		3,713		7,122		7,285
Diners Club(1)	7,800		7,198		15,182		13,936
Total Payment Services	50,109		44,767		97,218		89,757
Discover Network—Proprietary(2)	33,342		31,780		63,201		60,356
Total Volume	$	83,451	$	76,547	$	160,419	$	150,113
Transactions Processed on Networks
Discover Network	551		538		1,054		1,024
PULSE Network	961		853		1,831		1,694
Total	1,512		1,391		2,885		2,718
Credit Card Volume
Discover Card Volume(3)	$	35,297	$	33,409	$	67,703	$	63,413
Discover Card Sales Volume(4)	$	32,172	$	30,702	$	61,306	$	58,254

(1) Diners Club volume is derived from data provided by licensees for Diners Club branded cards issued outside North America and is subject to subsequent revision or amendment.

(2) Represents gross proprietary sales volume on the Discover Network.

(3) Represents Discover card activity related to net sales, balance transfers, cash advances and other activity.

(4) Represents Discover card activity related to net sales.

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Direct Banking

Our Direct Banking segment reported pretax income of $831 million and $1.7 billion for the three and six months ended June 30, 2017, respectively, as compared to pretax income of $868 million and $1.8 billion for the three and six months ended June 30, 2016, respectively.

Loan receivables increased to $78.0 billion at June 30, 2017 as compared to $77.3 billion at December 31, 2016 primarily due to growth in the credit card loans portfolio. Discover card sales volume was $32.2 billion and $61.3 billion for the three and six months ended June 30, 2017, respectively, which was an increase of 4.8% and 5.2%, respectively, as compared to the same periods in 2016. This volume growth was primarily driven by an increase in consumer spending.

Net interest margin increased for the three and six months ended June 30, 2017 as compared to the same periods in 2016 primarily driven by higher yields on credit card loans, partially offset by higher funding costs. The increase in yields on credit card loans was primarily due to the prime rate increase and a higher portion of revolving card receivables, partially offset by higher promotional balances in the card portfolio and higher interest charge-offs. Interest income increased during the three and six months ended June 30, 2017 as compared to the same periods in 2016 due to loan growth and yield expansion. Interest expense increased during the three and six months ended June 30, 2017 as compared to the same periods in 2016 primarily due to higher market rates, a change in funding mix and a larger funding base.

At June 30, 2017 and December 31, 2016, our delinquency rate for credit card loans over 30 days past due was 2.00% and 2.04%, respectively. For the three and six months ended June 30, 2017, our net charge-off rate on credit cards increased to 2.94% and 2.89%, respectively, as compared to 2.39% and 2.37% for the same periods in 2016. For the three and six months ended June 30, 2017, the provision for loan losses increased as compared to the same periods in 2016primarily due to the higher levels of net charge-offs combined with a larger build of allowance for loan losses. For a detailed discussion on provision for loan losses, see "— Loan Quality — Provision and Allowance for Loan Losses."

Total other income increased in the three months ended June 30, 2017 and decreased in the six months ended June 30, 2017 as compared to the same periods in 2016. During the three and six months ended June 30, 2017,the change was due primarily to an increase in discount and interchange revenue driven by higher sales volume, which was more than offset by higher promotional rewards in the first quarter of 2017. In addition, the increase in loan fee income was primarily due to an increase in late fees.

Total other expense increased in the three and six months ended June 30, 2017 as compared to the same periods in 2016. During the three and six months ended June 30, 2017, the increase was primarily driven by an increase in employee compensation and benefits offset by a decrease in information processing and communications. The increase in employee compensation and benefits was primarily driven by the impact of added headcount for regulatory and compliance needs and higher average salaries. The decrease in information processing and communications was primarily the result of infrastructure efficiencies. For the six months ended June 30, 2017, the decrease in professional fees was driven primarily by the completion of a look back project related to anti-money laundering remediation in 2016, offset by higher spend in collection efforts and investments in technology and infrastructure in 2017.

Payment Services

Our Payment Services segment reported pretax income of $36 million and $80 million for the three and six months ended June 30, 2017, respectively, as compared to pretax income of $30 million and $62 million for the same periods in 2016. The increase in segment pretax income was primarily driven by an increase in transaction processing revenue due to higher point-of-sale transactions.

Downturns in the global economy or negative impacts in foreign currency may adversely affect our financial condition or results of operations in our Payment Services segment. We continue to work with our Diners Club licensees with regard to their ability to maintain financing sufficient to support business operations. We may continue to provide additional support in the future, including loans, facilitating transfer of ownership, or acquiring assets or licensees, which may cause us to incur losses. The licensees that we currently consider to be of concern accounted for approximately 4%of Diners Club revenues during the three and six months ended June 30, 2017.

Critical Accounting Estimates

In preparing our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States ("GAAP"), management must make judgments and use estimates and assumptions about the

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effects of matters that are uncertain. For estimates that involve a high degree of judgment and subjectivity, it is possible that different estimates could reasonably be derived for the same period. For estimates that are particularly sensitive to changes in economic or market conditions, significant changes to the estimated amount from period to period are also possible. Management believes the current assumptions and other considerations used to estimate amounts reflected in our condensed consolidated financial statements are appropriate. However, if actual experience differs from the assumptions and other considerations used in estimating amounts in our condensed consolidated financial statements, the resulting changes could have a material effect on our consolidated results of operations and, in certain cases, could have a material effect on our consolidated financial condition. Management has identified the estimates related to our allowance for loan losses, the evaluation of goodwill and other non-amortizable intangible assets for potential impairment, the accrual of income taxes and estimates of future cash flows associated with PCI loans as critical accounting estimates. These critical accounting estimates are discussed in greater detail in our annual report on Form 10-K for the year ended December 31, 2016. That discussion can be found within “Management’s Discussion and Analysis of Financial Condition and Results of Operations” under the heading “— Critical Accounting Estimates.” There have not been any material changes in the methods used to formulate these critical accounting estimates from those discussed in our annual report on Form 10-K for the year ended December 31, 2016.

Earnings Summary

The following table outlines changes in our condensed consolidated statements of income (dollars in millions):
	For the Three Months Ended June 30,				2017 vs. 2016 Increase (Decrease)					For the Six Months Ended June 30,				2017 vs. 2016 Increase (Decrease)
	2017		2016		$			%		2017		2016		$			%
Interest income	$	2,338	$	2,090	$	248		12	%	$	4,616	$	4,174	$	442		11	%
Interest expense	400		339		61			18	%	786		673		113			17	%
Net interest income	1,938		1,751		187			11	%	3,830		3,501		329			9	%
Provision for loan losses	640		412		228			55	%	1,226		836		390			47	%
Net interest income after provision for loan losses	1,298		1,339		(41		)	(3	)%	2,604		2,665		(61		)	(2	)%
Other income	481		465		16			3	%	928		939		(11		)	(1	)%
Other expense	912		906		6			1	%	1,797		1,792		5			—	%
Income before income tax expense	867		898		(31		)	(3	)%	1,735		1,812		(77		)	(4	)%
Income tax expense	321		282		39			14	%	625		621		4			1	%
Net income	$	546	$	616	$	(70	)	(11	)%	$	1,110	$	1,191	$	(81	)	(7	)%

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Net Interest Income

The table that follows this section has been provided to supplement the discussion below and provide further analysis of net interest income and net interest margin. Net interest income represents the difference between interest income earned on our interest-earning assets and the interest expense incurred to finance those assets. We analyze net interest income in total by calculating net interest margin (net interest income as a percentage of average total loan receivables) and net yield on interest-bearing assets (net interest income as a percentage of average total interest-earning assets). We also separately consider the impact of the level of loan receivables and the related interest yield and the impact of the cost of funds related to each of our funding sources, along with the income generated by our liquidity portfolio, on net interest income.

Our interest-earning assets consist of: (i) cash and cash equivalents primarily related to amounts on deposit with the Federal Reserve Bank of Philadelphia, (ii) restricted cash, (iii) other short-term investments, (iv) investment securities and (v) loan receivables. Our interest-bearing liabilities consist primarily of deposits, both direct-to-consumer and brokered, and long-term borrowings, including amounts owed to securitization investors. Net interest income is influenced by the following:

• The level and composition of loan receivables, including the proportion of credit card loans to other loans, as well as the proportion of loan receivables bearing interest at promotional rates as compared to standard rates;

• The credit performance of our loans, particularly with regard to charge-offs of finance charges, which reduce interest income;

• The terms of long-term borrowings and certificates of deposit upon initial offering, including maturity and interest rate;

• The level and composition of other interest-bearing assets and liabilities, including our liquidity portfolio;

• Changes in the interest rate environment, including the levels of interest rates and the relationships among interest rate indices, such as the prime rate, the Federal Funds rate and the London Interbank Offered Rate;

• The effectiveness of interest rate swaps in our interest rate risk management program; and

• The difference between the carrying amount and future cash flows expected to be collected on PCI loans.

Net interest margin increased for the three and six months ended June 30, 2017 as compared to the same periods in 2016 primarily driven by higher yields on credit card loans, partially offset by higher funding costs. The increase in yields on credit card loans was primarily due to the prime rate increase and a higher portion of revolving card receivables, partially offset by higher promotional balances in the card portfolio and higher interest charge-offs. Interest income increased during the three and six months ended June 30, 2017 as compared to the same periods in 2016 due to loan growth and yield expansion. Interest expense increased during the three and six months ended June 30, 2017 as compared to the same periods in 2016 primarily due to higher market rates, a change in funding mix and a larger funding base.

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Average Balance Sheet Analysis (dollars in millions)
	For the Three Months Ended June 30,
	2017							2016
	Average Balance			Rate		Interest		Average Balance			Rate		Interest
Assets
Interest-earning assets
Cash and cash equivalents	$	12,921		1.05	%	$	35	$	10,750		0.50	%	$	13
Restricted cash	559			0.89	%	1		263			0.41	%	—
Other short-term investments	—			—	%	—		852			0.86	%	2
Investment securities	1,695			1.58	%	7		2,697			1.49	%	10
Loan receivables(1)
Credit card(2)	60,700			12.66	%	1,916		56,124			12.42	%	1,734
Personal loans	6,820			12.22	%	208		5,608			12.25	%	171
Private student loans	6,634			7.71	%	127		5,915			7.41	%	109
PCI student loans	2,386			6.72	%	40		2,901			6.55	%	47
Other	314			5.59	%	4		262			5.04	%	4
Total loan receivables	76,854			11.98	%	2,295		70,810			11.72	%	2,065
Total interest-earning assets	92,029			10.19	%	2,338		85,372			9.84	%	2,090
Allowance for loan losses	(2,262		)					(1,918		)
Other assets	4,147							4,502
Total assets	$	93,914						$	87,956
Liabilities and Stockholders’ Equity
Interest-bearing liabilities
Interest-bearing deposits
Time deposits(3)	$	26,054		1.90	%	123		$	24,682		1.74	%	107
Money market deposits(4)	6,808			1.25	%	21		6,903			1.06	%	18
Other interest-bearing savings deposits	19,694			1.11	%	55		16,370			1.01	%	41
Total interest-bearing deposits(5)	52,556			1.52	%	199		47,955			1.39	%	166
Borrowings
Short-term borrowings	2			1.06	%	—		2			0.64	%	—
Securitized borrowings(3)(4)	16,141			2.31	%	93		16,635			2.06	%	85
Other long-term borrowings(3)	9,979			4.36	%	108		7,984			4.40	%	88
Total borrowings	26,122			3.09	%	201		24,621			2.82	%	173
Total interest-bearing liabilities	78,678			2.04	%	400		72,576			1.88	%	339
Other liabilities and stockholders’ equity	15,236							15,380
Total liabilities and stockholders’ equity	$	93,914						$	87,956
Net interest income						$	1,938						$	1,751
Net interest margin(6)				10.11	%						9.94	%
Net yield on interest-bearing assets(7)				8.44	%						8.25	%
Interest rate spread(8)				8.15	%						7.96	%

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Average Balance Sheet Analysis (dollars in millions)
	For the Six Months Ended June 30,
	2017							2016
	Average Balance			Rate		Interest		Average    Balance(1)			Rate(1)		Interest
Assets
Interest-earning assets
Cash and cash equivalents	$	13,304		0.92	%	$	61	$	10,602		0.50	%	$	26
Restricted cash	689			0.78	%	3		532			0.40	%	1
Other short-term investments	—			—	%	—		426			0.86	%	2
Investment securities	1,713			1.60	%	14		2,848			1.48	%	21
Loan receivables(2)
Credit card(3)	60,413			12.66	%	3,792		56,124			12.42	%	3,467
Personal loans	6,702			12.20	%	405		5,555			12.23	%	338
Private student loans	6,656			7.62	%	251		5,918			7.36	%	216
PCI student loans	2,452			6.69	%	81		2,973			6.50	%	96
Other	298			5.50	%	9		253			5.11	%	7
Total loan receivables	76,521			11.96	%	4,538		70,823			11.71	%	4,124
Total interest-earning assets	92,227			10.09	%	4,616		85,231			9.85	%	4,174
Allowance for loan losses	(2,214		)					(1,892		)
Other assets	4,157							4,478
Total assets	$	94,170						$	87,817
Liabilities and Stockholders’ Equity
Interest-bearing liabilities
Interest-bearing deposits
Time deposits(4)	$	26,335		1.88	%	245		$	25,066		1.71	%	213
Money market deposits(5)	6,859			1.20	%	41		6,944			1.05	%	36
Other interest-bearing savings deposits	19,363			1.09	%	104		15,723			1.01	%	79
Total interest-bearing deposits(6)	52,557			1.50	%	390		47,733			1.38	%	328
Borrowings
Short-term borrowings	2			0.89	%	—		2			0.64	%	—
Securitized borrowings(4)(5)	16,548			2.24	%	184		16,792			2.05	%	171
Other long-term borrowings(4)	9,791			4.37	%	212		7,960			4.39	%	174
Total borrowings	26,341			3.03	%	396		24,754			2.80	%	345
Total interest-bearing liabilities	78,898			2.01	%	786		72,487			1.87	%	673
Other liabilities and stockholders’ equity	15,272							15,330
Total liabilities and stockholders’ equity	$	94,170						$	87,817
Net interest income						$	3,830						$	3,501
Net interest margin(7)				10.09	%						9.94	%
Net yield on interest-bearing assets(8)				8.37	%						8.26	%
Interest rate spread(9)				8.08	%						7.98	%

(1) Average balances of loan receivables include non-accruing loans, which are included in the yield calculations. If the non-accruing loan balances were excluded, there would not be a material impact on the amounts reported above.

(2) Interest income on credit card loans includes $54 million and $48 million of amortization of balance transfer fees for the three months ended June 30, 2017 and 2016, respectively. Interest income on credit card loans includes $106 million and $93 million of amortization of balance transfer fees for the six months ended June 30, 2017 and 2016, respectively.

(3) Includes the impact of interest rate swap agreements used to change a portion of fixed-rate funding to floating-rate funding.

(4) Includes the impact of interest rate swap agreements used to change a portion of floating-rate funding to fixed-rate funding.

(5) Includes the impact of FDIC insurance premiums and Large Institution Surcharge.

(6) Net interest margin represents net interest income as a percentage of average total loan receivables.

(7) Net yield on interest-bearing assets represents net interest income as a percentage of average total interest-earning assets.

(8) Interest rate spread represents the difference between the rate on total interest-earning assets and the rate on total interest-bearing liabilities.

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Loan Quality

Loan receivables consist of the following (dollars in millions):
	June 30, 2017			December 31, 2016
Loan receivables
Credit card loans	$	61,797		$	61,522
Other loans
Personal loans	6,955			6,481
Private student loans	6,594			6,393
Other	329			274
Total other loans	13,878			13,148
PCI loans(1)	2,322			2,584
Total loan receivables	77,997			77,254
Allowance for loan losses	(2,384		)	(2,167		)
Net loan receivables	$	75,613		$	75,087

(1) Represents PCI private student loans. See Note 3: Loan Receivables to our condensed consolidated financial statements for more information regarding PCI loans.

Provision and Allowance for Loan Losses

Provision for loan losses is the expense related to maintaining the allowance for loan losses at an appropriate level to absorb the estimated probable losses in the loan portfolio at each period end date. While establishing the estimate for probable losses requires management judgment, the factors that influence the provision for loan losses include:

• The impact of current and predictive general economic conditions on the consumer, including unemployment levels, bankruptcy trends and interest rate movements;

• Changes in consumer spending and payment behaviors;

• Changes in our loan portfolio, including the overall mix of accounts, products and loan balances within the portfolio and maturation of the loan portfolio;

• The level and direction of historical and anticipated loan delinquencies and charge-offs;

• The credit quality of the loan portfolio, which reflects, among other factors, our credit granting practices and effectiveness of collection efforts; and

• Regulatory changes or new regulatory guidance.

In determining the allowance for loan losses, we estimate probable losses separately for segments of the loan portfolio that have similar risk characteristics. We use a migration analysis to estimate the likelihood that a loan will progress through the various stages of delinquency. We use other analyses to estimate losses incurred from non-delinquent accounts, which adds to the identification of loss emergence. We use these analyses together as a basis for determining our allowance for loan losses.

The provision for loan losses is the amount of expense realized after considering the level of net charge-offs in the period and the required amount of allowance for loan losses at the balance sheet date. For the three and six months ended June 30, 2017, the provision for loan losses increased by $228 million, or 55%, and $390 million, or 47%, respectively, as compared to the same periods in 2016. The increase was primarily due to higher levels of net charge-offs combined with a larger reserve build for the three and six months ended June 30, 2017 as compared to the same periods in 2016.

The allowance for loan losses was $2.4 billion at June 30, 2017, which reflects a $217 million reserve build over the amount of the allowance for loan losses at December 31, 2016. The reserve build was due to seasoning of loan growth and increasing consumer leverage.

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The following tables provide changes in our allowance for loan losses (dollars in millions):
	For the Three Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,892		$	207		$	156		$	9		$	2,264
Additions
Provision for loan losses	533			82			23			2			640
Deductions
Charge-offs	(561		)	(61		)	(22		)	(1		)	(645		)
Recoveries	116			7			2			—			125
Net charge-offs	(445		)	(54		)	(20		)	(1		)	(520		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Three Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,590		$	165		$	148		$	18		$	1,921
Additions
Provision for loan losses	347			44			20			1			412
Deductions
Charge-offs	(448		)	(38		)	(19		)	—			(505		)
Recoveries	114			5			2			—			121
Net charge-offs	(334		)	(33		)	(17		)	—			(384		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949
	For the Six Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,790		$	200		$	158		$	19		$	2,167
Additions
Provision for loan losses	1,057			140			35			(6		)	1,226
Deductions
Charge-offs	(1,096		)	(118		)	(39		)	(3		)	(1,256		)
Recoveries	229			13			5			—			247
Net charge-offs	(867		)	(105		)	(34		)	(3		)	(1,009		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Six Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,554		$	155		$	143		$	17		$	1,869
Additions
Provision for loan losses	709			88			37			2			836
Deductions
Charge-offs	(887		)	(77		)	(34		)	—			(998		)
Recoveries	227			10			5			—			242
Net charge-offs	(660		)	(67		)	(29		)	—			(756		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949

(1) Includes both PCI and non-PCI private student loans.

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Net Charge-offs

Our net charge-offs include the principal amount of losses charged off less principal recoveries and exclude charged-off and recovered interest and fees and fraud losses. Charged-off and recovered interest and fees are recorded in interest income and loan fee income, respectively, which is effectively a reclassification of the provision for loan losses, while fraud losses are recorded in other expense. Credit card loan receivables are charged off at the end of the month during which an account becomes 180 days contractually past due. Personal loans and private student loans, which are closed-end consumer loan receivables, are generally charged off at the end of the month during which an account becomes 120 days contractually past due. Generally, customer bankruptcies and probate accounts are charged off at the end of the month 60 days following the receipt of notification of the bankruptcy or death but not later than the 180-day or 120-day contractual time frame.

The following table presents amounts and rates of net charge-offs of key loan products (dollars in millions):
	For the Three Months Ended June 30,								For the Six Months Ended June 30,
	2017				2016				2017				2016
	$		%		$		%		$		%		$		%
Credit card loans	$	445	2.94	%	$	334	2.39	%	$	867	2.89	%	$	660	2.37	%
Personal loans	$	54	3.18	%	$	33	2.38	%	$	105	3.17	%	$	67	2.41	%
Private student loans (excluding PCI(1))	$	20	1.15	%	$	17	1.10	%	$	34	0.99	%	$	29	0.98	%

(1) Charge-offs for PCI loans did not result in a charge to earnings during any of the periods presented and are therefore excluded from the calculation. See Note 3: Loan Receivables to our condensed consolidated financial statements for more information regarding the accounting for charge-offs on PCI loans.

The net charge-off rate on our credit card loans increased by 55 and 52 basis points for the three and six months ended June 30, 2017, respectively, when compared to the same periods in 2016. The net charge-off rate on our personal loans increased by 80 and 76 basis points for the three and six months ended June 30, 2017, respectively, when compared to the same periods in 2016. The increase for both credit card loans and personal loans was driven by seasoning of loan growth and increasing consumer leverage. The net charge-off rate on our private student loans excluding PCI remained relatively flat for the three and six months ended June 30, 2017 when compared to the same periods in 2016.

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Delinquencies

Delinquencies are an indicator of credit quality at a point in time. A loan balance is considered delinquent when contractual payments on the loan become 30 days past due.

The following table presents the amounts and rates of key loan products that are 30 and 90 days or more delinquent, loan receivables that are not accruing interest, regardless of delinquency and restructured loans (dollars in millions):
	June 30, 2017				December 31, 2016
	$		%		$		%
Loans 30 or more days delinquent
Credit card loans	$	1,237	2.00	%	$	1,252	2.04	%
Personal loans	$	78	1.14	%	$	74	1.12	%
Private student loans (excluding PCI loans(1))	$	140	2.12	%	$	141	2.22	%
Loans 90 or more days delinquent
Credit card loans	$	603	0.98	%	$	597	0.97	%
Personal loans	$	21	0.30	%	$	19	0.29	%
Private student loans (excluding PCI loans(1))	$	42	0.63	%	$	35	0.55	%
Loans not accruing interest	$	226	0.30	%	$	216	0.29	%
Restructured loans
Credit card loans(2)	$	1,148	1.86	%	$	1,085	1.76	%
Personal loans(3)	$	92	1.32	%	$	81	1.25	%
Private student loans (excluding PCI loans(1))(4)	$	115	1.74	%	$	86	1.35	%

(1) Excludes PCI loans which are accounted for on a pooled basis. Since a pool is accounted for as a single asset with a single composite interest rate and aggregate expectation of cash flows, the past-due status of a pool, or that of the individual loans within a pool, is not meaningful. Because we are recognizing interest income on a pool of loans, it is all considered to be performing.

(2) Restructured credit card loans include $63 million and $60 million at June 30, 2017 and December 31, 2016, respectively, that are also included in loans over 90 days delinquent or more.

(3) Restructured personal loans include $3 million and $2 million at June 30, 2017 and December 31, 2016, respectively, that are also included in loans over 90 days delinquent or more.

(4) Restructured private student loans include $5 million and $3 million at June 30, 2017 and December 31, 2016, that are also included in loans over 90 days delinquent or more.

The 30-day delinquency rate for credit card loans at June 30, 2017 decreased as compared to December 31, 2016 primarily due to seasonality while the 90-day delinquency rate remained relatively flat at June 30, 2017 as compared to December 31, 2016. Personal loans 30-day and 90-day delinquency rates at June 30, 2017 remained relatively stable as compared to December 31, 2016. The 30-day delinquency rate for private student loans at June 30, 2017 decreased while the 90-day delinquency rate increased compared to December 31, 2016 as a result of seasonality of the portfolio.

The restructured credit card and personal loan balances at June 30, 2017 increased as compared to December 31, 2016 due to continued loan growth and seasoning. At June 30, 2017, the restructured private student loan balance increased as compared to December 31, 2016 as a result of greater utilization of programs available as more loans have entered into repayment.

Modified and Restructured Loans

We have loan modification programs that provide for temporary or permanent hardship relief for our credit card loans to borrowers experiencing financial difficulties. The temporary hardship program primarily consists of a reduced minimum payment and an interest rate reduction, both lasting for a period no longer than 12 months. The permanent modification program involves changing the structure of the loan to a fixed payment loan with a maturity no longer than 60 months and reducing the interest rate on the loan. The permanent modification program does not normally provide for the forgiveness of unpaid principal, but may allow for the reversal of certain unpaid interest or fee assessments. We also make permanent loan modifications for customers who request financial assistance through external sources, such as a consumer credit counseling agency program. These loans continue to be subject to the original minimum payment terms and do not normally include waiver of unpaid principal, interest or fees. Credit card loans included in temporary and permanent programs are accounted for as troubled debt restructurings. For additional information regarding the accounting treatment for these loans as well as

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amounts recorded in the financial statements related to these loans, see Note 3: Loan Receivables to our condensed consolidated financial statements.

For personal loan customers, in certain situations we offer various payment programs, including temporary and permanent programs. The temporary programs normally consist of a reduction of the minimum payment for a period of no longer than 12 months with the option of a final balloon payment required at the end of the loan term or an extension of the maturity date with the total term not exceeding nine years. Further, in certain circumstances, the interest rate on the loan is reduced. The permanent programs involve changing the terms of the loan in order to pay off the outstanding balance over a longer term and also in certain circumstances reducing the interest rate on the loan. Similar to the temporary programs, the total term may not exceed nine years. We also allow permanent loan modifications for customers who request financial assistance through external sources, similar to our credit card customers discussed above. Payments are modified based on the new terms agreed upon with the credit counseling agency. Personal loans included in temporary and permanent programs are accounted for as troubled debt restructurings.

At June 30, 2017, there was $5.7 billion of private student loans in repayment, which includes both PCI and non-PCI loans to students who are not in deferment. To assist student loan borrowers who are experiencing temporary financial difficulties but are willing to resume making payments, we may offer hardship forbearance or programs that include payment deferral, temporary payment reduction, temporary interest rate reduction or extended terms. A modified loan typically meets the definition of a troubled debt restructuring based on the cumulative length of the concession period and an evaluation of the credit quality of the borrower based on FICO scores. Prior to the third quarter of 2016, only a second forbearance when the borrower was 30 days or greater delinquent was considered a troubled debt restructuring. As a result, the student loan balances being accounted for as troubled debt restructuring increased, although it did not lead to significant changes in the balance of overall allowance for loan losses.

Borrower performance after using payment programs or forbearance is monitored and we believe the programs help to prevent defaults and are useful in assisting customers experiencing financial difficulties. We plan to continue to use payment programs and forbearance and, as a result, we expect to have additional loans classified as troubled debt restructurings in the future.

Other Income

The following table presents the components of other income (dollars in millions):
	For the Three Months Ended June 30,				2017 vs. 2016 Increase (Decrease)					For the Six Months Ended June 30,				2017 vs. 2016 (Decrease) Increase
	2017		2016		$			%		2017		2016		$			%
Discount and interchange revenue(1)	$	278	$	265	$	13		5	%	$	511	$	538	$	(27	)	(5	)%
Protection products revenue	56		59		(3		)	(5	)%	114		120		(6		)	(5	)%
Loan fee income	83		79		4			5	%	172		159		13			8	%
Transaction processing revenue	42		39		3			8	%	81		75		6			8	%
Other income	22		23		(1		)	(4	)%	50		47		3			6	%
Total other income	$	481	$	465	$	16		3	%	$	928	$	939	$	(11	)	(1	)%

(1) Net of rewards, including Cashback Bonus rewards, of $388 million and $371 million for the three months ended June 30, 2017 and 2016, respectively, and of $751 million and $663 million for the six months ended June 30, 2017 and 2016, respectively.

Total other income increased in the three months ended June 30, 2017 by $16 million and decreased in the six months ended June 30, 2017 by $11 million, respectively, as compared to the same periods in 2016. During the three and six months ended June 30, 2017, the change was due primarily to an increase in discount and interchange revenue driven by higher sales volume, which was more than offset by higher promotional rewards in the first quarter of 2017. In addition, the increase in loan fee income was primarily due to an increase in late fees.

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Other Expense

The following table represents the components of other expense (dollars in millions):
	For the Three Months Ended June 30,				2017 vs. 2016 Increase (Decrease)					For the Six Months Ended June 30,				2017 vs. 2016 Increase (Decrease)
	2017		2016		$			%		2017		2016		$			%
Employee compensation and benefits	$	367	$	340	$	27		8	%	$	730	$	685	$	45		7	%
Marketing and business development	192		198		(6		)	(3	)%	360		360		—			—	%
Information processing and communications	77		89		(12		)	(13	)%	157		177		(20		)	(11	)%
Professional fees	156		150		6			4	%	303		310		(7		)	(2	)%
Premises and equipment	23		23		—			—	%	48		47		1			2	%
Other expense	97		106		(9		)	(8	)%	199		213		(14		)	(7	)%
Total other expense	$	912	$	906	$	6		1	%	$	1,797	$	1,792	$	5		—	%

Total other expense increased in the three and six months ended June 30, 2017 by $6 million and $5 million, respectively, as compared to the same periods in 2016. During the three and six months ended June 30, 2017, the increase was primarily driven by an increase in employee compensation and benefits offset by a decrease in information processing and communications. The increase in employee compensation and benefits was primarily driven by the impact of added headcount for regulatory and compliance needs and higher average salaries. The decrease in information processing and communications was primarily the result of infrastructure efficiencies. For the six months ended June 30, 2017, the decrease in professional fees was driven primarily by the completion of a look back project related to anti-money laundering remediation in 2016, offset by higher spend in collection efforts and investments in technology and infrastructure in 2017.

Income Tax Expense

The following table presents the calculation of the effective income tax rate (dollars in millions, except effective income tax rate):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Income before income tax expense	$	867		$	898		$	1,735		$	1,812
Income tax expense	$	321		$	282		$	625		$	621
Effective income tax rate	37.1		%	31.4		%	36.0		%	34.3		%

Income tax expense increased $39 million and $4 million for the three and six months ended June 30, 2017, respectively, compared to the same periods in 2016. The effective tax rates for the three and six months ended June 30, 2017 of 37.1% and 36.0%, respectively, increased from 31.4% and 34.3% for the same periods in 2016. The increase in rates is primarily due to the settlement with the United States Congress Joint Committee on Taxation that occurred in the second quarter of 2016.

Liquidity and Capital Resources

Funding and Liquidity

We seek to maintain stable, diversified and cost-effective funding sources and a strong liquidity profile in order to fund our business and repay or refinance our maturing obligations under both normal operating conditions and periods of economic or financial stress. In managing our liquidity risk, we seek to maintain a prudent liability maturity profile and ready access to an ample store of primary and contingent liquidity sources. Our primary funding sources include direct-to-consumer and brokered deposits, public term asset-backed securitizations and other short-term and long-term borrowings. Our primary liquidity sources include a liquidity portfolio comprised of highly liquid, unencumbered assets, including cash and cash equivalents and investment securities, and borrowing capacity through private term asset-backed securitizations. In addition, we have unused capacity with the Federal Reserve discount window which provides another source of contingent liquidity.

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Funding Sources

Deposits

We offer deposit products to customers through two channels: (i) through direct marketing, internet origination and affinity relationships (“direct-to-consumer deposits”); and (ii) indirectly through contractual arrangements with securities brokerage firms (“brokered deposits”). Direct-to-consumer deposits include certificates of deposit, money market accounts, online savings and checking accounts, and IRA certificates of deposit, while brokered deposits include certificates of deposit and sweep accounts. At June 30, 2017, we had $37.7 billion of direct-to-consumer deposits and $15.2 billion of brokered and other deposits.

Credit Card Securitization Financing

We use the securitization of credit card receivables as a source of funding. We access the asset-backed securitization market using the Discover Card Master Trust I ("DCMT") and the Discover Card Execution Note Trust ("DCENT"), through which we issue DCENT DiscoverSeries notes both publicly and through private transactions. From time to time, we may add credit card receivables to these trusts to create sufficient funding capacity for future securitizations while managing the seller’s interest. We retain significant exposure to the performance of trust assets through holdings of the seller's interest and subordinated security classes of DCENT.

The securitization structures include certain features designed to protect investors. The primary feature relates to the availability and adequacy of cash flows in the securitized pool of receivables to meet contractual requirements, the insufficiency of which triggers early repayment of the securities. We refer to this as "economic early amortization," which is based on excess spread levels. Excess spread is the amount by which income received by a trust during a collection period, including interest collections, fees and interchange, exceeds the fees and expenses of the trust during such collection period, including interest expense, servicing fees and charged-off receivables. In the event of an economic early amortization, which would occur if the excess spread fell below 0% on a three-month rolling average basis, we would be required to repay the affected outstanding securitized borrowings using available collections received by the trust (the period of ultimate repayment would be determined by the amount and timing of collections received). An early amortization event would negatively impact our liquidity and require us to utilize our available non-securitization related contingent liquidity or rely on alternative funding sources, which may or may not be available at the time. As of June 30, 2017, the DiscoverSeries three-month rolling average excess spread was 12.68%.

We may elect to add receivables to the restricted pool of receivables subject to certain requirements. Through our wholly-owned indirect subsidiary, Discover Funding LLC, we are required to maintain a contractual minimum level of receivables in the trust in excess of the face value of outstanding investors’ interests. This excess is referred to as the minimum seller’s interest. The required minimum seller’s interest in the pool of trust receivables, which is included in credit card loan receivables restricted for securitization investors, is set at approximately 7% in excess of the total investors’ interests (which includes interests held by third parties as well as those interests held by us). If the level of receivables in the trust was to fall below the required minimum, we would be required to add receivables from the unrestricted pool of receivables, which would increase the amount of credit card loan receivables restricted for securitization investors. A decline in the amount of the excess seller’s interest could occur if balance repayments and charge-offs exceeded new lending on the securitized accounts or as a result of changes in total outstanding investors’ interests. Seller's interest is impacted by seasonality as higher balance repayments tend to occur in the first calendar year quarter. If we could not add enough receivables to satisfy the requirement, an early amortization (or repayment) of investors’ interests would be triggered. No accounts were added to those restricted for securitization investors for the three or six months ended June 30, 2017.

At June 30, 2017, we had $16.1 billion of outstanding public asset-backed securities and $5.1 billion of outstanding subordinated asset-backed securities that had been issued to our wholly-owned subsidiaries.

The following table summarizes expected contractual maturities of the investors’ interests in credit card securitizations excluding those that have been issued to our wholly-owned subsidiaries (dollars in millions):
At June 30, 2017	Total		Less Than One Year		One Year Through Three Years		Four Years Through Five Years		After Five Years
Scheduled maturities of long-term borrowings - owed to credit card securitization investors	$	16,030	$	3,949	$	8,634	$	2,128	$	1,319

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The triple-A rating of DCENT Class A Notes issued to date has been based, in part, on an FDIC rule which created a safe harbor that provides that the FDIC, as conservator or receiver, will not, using its power to disaffirm or repudiate contracts, seek to reclaim or recover assets transferred in connection with a securitization, or recharacterize them as assets of the insured depository institution, provided such transfer satisfies the conditions for sale accounting treatment under previous GAAP. Although the implementation of the Financial Accounting Standards Board Accounting Standards Codification Topic 860, Transfers and Servicing, no longer qualified certain transfers of assets for sale accounting treatment, the FDIC approved a final rule that preserved the safe-harbor treatment applicable to revolving trusts and master trusts, including DCMT, so long as those trusts would have satisfied the original FDIC safe harbor if evaluated under GAAP pertaining to transfers of financial assets in effect prior to December 1, 2009. Other legislative and regulatory developments may, however, impact our ability and/or desire to issue asset-backed securities in the future.

Other Long-Term Borrowings—Student Loans

At June 30, 2017, we had $728 million of remaining principal balance outstanding on securitized debt assumed as part of the acquisition of The Student Loan Corporation. Principal and interest payments on the underlying student loans will reduce the balance of these secured borrowings over time.

Other Long-Term Borrowings - Corporate and Bank Debt

The following table provides a summary of Discover Financial Services (Parent Company) and Discover Bank outstanding fixed-rate debt (dollars in millions):
At June 30, 2017	Principal Amount Outstanding
Discover Financial Services (Parent Company) fixed-rate senior notes, maturing 2019-2027	$	2,900
Discover Financial Services (Parent Company) fixed-rate retail notes, maturing 2017-2031	$	232
Discover Bank fixed-rate senior bank notes, maturing 2018-2026	$	6,150
Discover Bank fixed-rate subordinated bank notes, maturing 2019-2020	$	700

Certain Discover Financial Services senior notes require us to offer to repurchase the notes at a price equal to 101% of their aggregate principal amount plus accrued and unpaid interest in the event of a change of control involving us and a corresponding ratings downgrade to below investment grade.

Short-Term Borrowings

As part of our regular funding strategy, we may from time to time borrow short-term funds in the Federal Funds market or the repurchase (“repo”) market through repurchase agreements. Federal Funds are short-term, unsecured loans between banks or other financial entities with a Federal Reserve account. Funds borrowed in the repo market are short-term, collateralized loans usually secured with highly-rated investment securities such as U.S. Treasury bills or notes, or federal agency mortgage bonds or debentures. At June 30, 2017 and December 31, 2016, there were no outstanding balances under the Federal Funds market or repurchase agreements.

Additional Funding Sources

Private Asset-Backed Securitizations

We have access to committed, undrawn borrowing capacity through privately placed asset-backed securitizations. At June 30, 2017, we had total committed capacity of $6.0 billion, none of which was drawn. While we may utilize funding from these private securitizations from time to time for normal business operations, their committed nature also makes them a reliable contingency funding source. Therefore, we reserve some undrawn capacity, based upon our liquidity stress testing results, for potential contingency funding needs. We also seek to ensure the stability and reliability of these securitizations by staggering their maturity dates and renewing them approximately one year prior to their scheduled maturity dates.

Federal Reserve

Discover Bank has access to the Federal Reserve Bank of Philadelphia’s discount window. As of June 30, 2017, Discover Bank had $25.9 billion of available borrowing capacity through the discount window based on the amount and type

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of assets pledged. We have no borrowings outstanding under the discount window and reserve this capacity as a source of contingency funding.

Funding Uses

Our primary uses of funds include the extensions of loans and credit, primarily through Discover Bank, the purchase of investment securities for our liquidity portfolio, working capital, and debt and capital service. We assess funding uses and liquidity needs under stressed or normal conditions, considering primary uses of funding, such as on-balance sheet loans, and contingent uses of funding, such as the need to post additional collateral for derivatives positions. In order to anticipate funding needs under stress, we conduct liquidity stress testing to assess the impact of idiosyncratic, market-wide, and hybrid scenarios with varying levels of liquidity risk reflecting a range of stress severity.

Credit Ratings

Our borrowing costs and capacity in certain funding markets, including securitizations and unsecured senior and subordinated debt, may be affected by the credit ratings of DFS, Discover Bank and the securitization trusts. Downgrades in these credit ratings could result in higher interest expense on our unsecured debt and asset securitizations, as well as higher collateral enhancement requirements for both our public and private asset securitizations. In addition to increased funding costs, deterioration in credit ratings could reduce our borrowing capacity in the unsecured debt and asset securitization capital markets.

We also maintain agreements with certain of our derivative counterparties that contain provisions that require DFS and Discover Bank to maintain an investment grade credit rating from specified major credit rating agencies. At June 30, 2017, Discover Bank's credit rating met specified thresholds set by its counterparties. However, if Discover Bank's credit ratings were reduced by one ratings notch, Discover Bank would be required to post additional collateral, which, as of June 30, 2017, would have been $38 million. DFS (Parent Company) had no outstanding derivatives as of June 30, 2017, therefore, no collateral was required.

A credit rating is not a recommendation to buy, sell or hold securities, may be subject to revision or withdrawal at any time by the assigning rating organization, and each rating should be evaluated independently of any other rating. Our credit ratings are summarized in the following table:
	Moody’s Investors Service	Standard & Poor’s	Fitch Ratings
Discover Financial Services
Senior unsecured debt	Ba1	BBB-	BBB+
Outlook for Discover Financial Services senior unsecured debt	Stable	Stable	Stable
Discover Bank
Senior unsecured debt	Baa3	BBB	BBB+
Outlook for Discover Bank senior unsecured debt	Stable	Stable	Stable
Subordinated debt	Ba1	BBB-	BBB
Discover Card Execution Note Trust
Class A(1)	Aaa(sf)	AAA(sf)	AAA(sf)

(1) An “sf” in the rating denotes rating agency identification for structured finance product ratings.

Liquidity

We seek to ensure that we have adequate liquidity to sustain business operations, fund asset growth and satisfy debt obligations under stressed or normal conditions. In addition to the funding sources discussed in the previous section, we also maintain highly liquid, unencumbered assets in our liquidity portfolio that we expect to be able to convert to cash quickly and with little loss of value using either the repo market or outright sales.

We maintain a liquidity risk and funding management policy which outlines the overall framework and general principles for managing liquidity risk across our business. The policy is approved by the Board of Directors with the implementation responsibilities delegated to the Asset and Liability Management Committee (the “ALCO”). We seek to balance the trade-offs between maintaining too much liquidity, which may be costly, with having too little liquidity, which could cause financial distress. Liquidity risk is centrally managed by the ALCO, which is chaired by our Treasurer and has cross-functional membership. The ALCO monitors the liquidity risk profiles of DFS and Discover Bank and oversees any

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actions Corporate Treasury may take to ensure that we maintain ready access to our funding sources and sufficient liquidity to meet current and projected needs. In addition, the ALCO and our Board of Directors regularly review our compliance with our liquidity limits at DFS and Discover Bank, which are established in accordance with the liquidity risk appetite set by our Board of Directors.

We employ a variety of metrics to monitor and manage liquidity. We utilize early warning indicators (“EWIs”) to detect the initial phases of liquidity stress events and a reporting and escalation process that is designed to be consistent with regulatory guidance. The EWIs include both idiosyncratic and systemic measures, and are monitored on a daily basis and reported to the ALCO regularly. A warning from one or more of these indicators triggers prompt review and decision-making by our senior management team, and in certain instances may lead to the convening of a senior-level response team and activation of our contingency funding plan.

In addition, we conduct liquidity stress testing regularly and ensure contingency funding is in place to address potential liquidity shortfalls. We evaluate a range of stress scenarios that are designed in accordance with regulatory requirements, including idiosyncratic, systemic and a combination of such events that could impact funding sources and our ability to meet liquidity needs. These scenarios measure the projected liquidity position at DFS and Discover Bank across a range of time horizons by comparing estimated contingency funding needs to available contingent liquidity.

Our primary liquidity sources include our liquidity portfolio and private securitizations with unused borrowing capacity, which we could utilize to satisfy liquidity needs during stressed or normal conditions. We seek to maintain sufficient liquidity to be able to satisfy all maturing obligations and fund business operations for at least 12 months in a severe stress environment. In addition, we have unused capacity with the Federal Reserve discount window which provides a source of contingent liquidity.

At June 30, 2017, our liquidity portfolio is comprised of highly liquid, unencumbered assets, including cash and cash equivalents and investment securities. Cash and cash equivalents were primarily in the form of deposits with the Federal Reserve. Investment securities primarily included debt obligations of the U.S. Treasury and residential mortgage-backed securities issued by U.S. government housing agencies. These investments are considered highly liquid, and we expect to have the ability to raise cash by selling them, utilizing repurchase agreements or pledging certain of these investments to access secured funding. The size and composition of our liquidity portfolio may fluctuate based upon the size of our Statement of Financial Condition as well as operational requirements and market conditions.

At June 30, 2017, our liquidity portfolio and undrawn credit facilities were $45.7 billion, which was $2.9 billion higher than the balance at December 31, 2016. During the three and six months ended June 30, 2017, the average balance of our liquidity portfolio was $15.0 billion.

	June 30, 2017		December 31, 2016
	(dollars in millions)
Liquidity portfolio
Cash and cash equivalents(1)	$	12,403	$	11,103
Investment securities(2)	1,462		1,532
Total liquidity portfolio	13,865		12,635
Private asset-backed securitizations(3)	6,000		6,000
Primary liquidity sources	19,865		18,635
Federal Reserve discount window(3)	25,877		24,194
Total liquidity portfolio and undrawn credit facilities	$	45,742	$	42,829

(1) Cash in the process of settlement and restricted cash are excluded from cash and cash equivalents for liquidity purposes.

(2) Excludes $37 million and $73 million of U.S. Treasury securities that have been pledged as swap collateral in lieu of cash as of June 30, 2017 and December 31, 2016, respectively.

(3) See "— Additional Funding Sources" for additional information.

Bank Holding Company Liquidity

The primary uses of funds at the unconsolidated DFS level include debt service obligations (interest payments and return of principal) and capital management activities, which include dividends on capital instruments and the periodic repurchase of shares of our common stock. Our primary sources of funds at the bank holding company level include the

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proceeds from the issuance of unsecured debt and preferred stock in the capital markets, as well as dividends from our subsidiaries, particularly Discover Bank. Under periods of idiosyncratic or systemic stress, the bank holding company could lose or experience impaired access to the capital markets. In addition, our regulators have the discretion to restrict dividend payments from Discover Bank to the bank holding company.

We utilize a measure referred to as Number of Months of Pre-Funding to determine the length of time Discover Financial Services can meet upcoming funding obligations including common and preferred dividend payments and debt service obligations using existing cash resources. At June 30, 2017, Discover Financial Services had sufficient cash resources to fund the dividend and debt service payments for more than 18 months.

We structure our debt maturity schedule to minimize the amount of debt maturing at the bank holding company within a short period of time. See Note 6: Long-Term Borrowings to our condensed consolidated financial statements for further information regarding our debt. Our ALCO and board of directors regularly review our compliance with our liquidity limits as a bank holding company, which are established in accordance with the liquidity risk appetite articulated by our Board of Directors.

Capital

Our primary sources of capital are from the earnings generated by our businesses and common and preferred stock issuances in the capital markets. We seek to manage capital to a level and composition sufficient to support the risks of our businesses, meet regulatory requirements, meet rating agency targets and debt investor expectations and support future business growth. Within these constraints, we are focused on deploying capital in a manner that provides attractive returns to our stockholders. The level, composition and utilization of capital are influenced by changes in the economic environment, strategic initiatives, and legislative and regulatory developments.

Under regulatory capital requirements adopted by the Federal Reserve and the FDIC, Discover Financial Services, along with Discover Bank, must maintain minimum levels of capital. Failure to meet minimum capital requirements can result in the initiation of certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could limit our business activities and have a direct material effect on our financial position and results. We must meet specific capital requirements that involve quantitative measures of assets, liabilities and certain off-balance sheet items, as calculated under regulatory guidance and regulations. Current or future legislative or regulatory initiatives may require us to hold more capital in the future.

In 2013, the Federal Reserve, the Office of the Comptroller of the Currency, and the FDIC issued the Basel III rules applicable to Discover Financial Services and Discover Bank. Under those rules, Discover Financial Services and Discover Bank are classified as "Standardized Approach" entities, defined as U.S. banking organizations with consolidated total assets over $50 billion but not exceeding $250 billion and consolidated total on-balance sheet foreign exposures less than $10 billion. Additional phase-in requirements related to components of the final capital rules will become effective through 2019. The Basel III rules include new minimum and "well-capitalized" risk-based capital and leverage ratios, effective January 1, 2015, and refine the definition of what constitutes "capital" for purposes of calculating those ratios of which certain requirements are subject to phase-in periods through the end of 2018 (the "transition period"). During the transition period, the effects of the changes to capital (i.e., certain deductions and adjustments) are recognized in 20% increments from 2015 through 2018. For example, one of the deductions from CET1 capital, goodwill and intangibles, was subject to a 40% of total deduction in 2015 that increased to 60% in 2016 and so on, until reaching 100% deduction of total in 2018. For additional information regarding the risk-based capital and leverage ratios, see Note 10: Capital Adequacy to our condensed consolidated financial statements.

The Basel III rules also introduced a capital conservation buffer on top of the minimum risk-weighted asset ratios. The buffer is designed to absorb losses during periods of economic stress. The calculation of the buffer started to phase in beginning on January 1, 2016 at the rate of 0.625% and increases by 0.625% on each subsequent January 1 until it reaches the maximum 2.5% on January 1, 2019. When the capital conservation buffer is fully phased-in on January 1, 2019, this will effectively result in minimum ratios of (i) CET1 to risk-weighted assets of at least 7.0%, (ii) Tier 1 capital to risk-weighted assets of at least 8.5% and (iii) Total capital to risk-weighted assets of at least 10.5%. Banking institutions with a capital ratio below the required amount will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall.

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Another main component of the Basel III rules is a prescribed standardized approach for calculating risk-weighted assets that expands the risk-weight range from 0% to 100% (under Basel I) to 0% to 1,250% (under Basel III). The new range is intended to be more risk-sensitive and the risk-weight assigned depends on the nature of the asset in question.

The Basel III rules provide for a number of the deductions from and adjustments to CET1, to the extent that any one such category exceeds 10% of CET1 or all such categories in the aggregate exceed 15%.

Basel III also requires disclosures relating to market discipline. This series of disclosures is commonly referred to as “Pillar 3.” The objective is to increase transparency of capital requirements for banking organizations. We are required to make prescribed regulatory disclosures on a quarterly basis regarding our capital structure, capital adequacy, risk exposures and risk-weighted assets. The Pillar 3 disclosures are made publicly available, on our website, as a stand-alone report called "Basel III Regulatory Capital Disclosures."

At June 30, 2017, Discover Financial Services and Discover Bank met the requirements for "well-capitalized" status under Regulation Y and the prompt corrective action rules, respectively, exceeding the regulatory minimums to which they were subject under the applicable rules.

As discussed in Note 10: Capital Adequacy to our condensed consolidated financial statements, we are subject to a CET1 capital ratio requirement under the Basel III rules. We believe that providing an estimate of our capital position based on the Basel III fully phased-in rules is important to complement the existing capital ratios and for comparability to other financial institutions. In addition, we disclose tangible common equity, which represents common equity less goodwill and intangibles. Management believes that common stockholders' equity excluding goodwill and intangibles is a more meaningful measure to investors of our true net asset value. As of June 30, 2017, the CET1 capital ratio calculated under Basel III fully phased-in rules and tangible common equity are not formally defined by U.S. GAAP or codified in the federal banking regulations and, as such, they are considered to be non-GAAP financial measures. Other financial services companies may also disclose this ratio and metric and definitions may vary, so we advise users of this information to exercise caution in comparing this ratio and metric for different companies.

The following table provides a reconciliation of total common stockholders’ equity (a U.S. GAAP financial measure) to tangible common equity (dollars in millions):
	June 30, 2017			December 31, 2016
Total common stockholders’ equity(1)	$	10,699		$	10,763
Less: Goodwill	(255		)	(255		)
Less: Intangible assets, net	(164		)	(166		)
Tangible common equity	$	10,280		$	10,342

(1) Total common stockholders’ equity is calculated as total stockholders’ equity less preferred stock.

The following table provides a reconciliation of CET1 capital calculated under Basel III transition rules to CET1 capital and risk-weighted assets calculated under fully phased-in Basel III rules (dollars in millions):
	June 30, 2017
Common equity Tier 1 capital (Basel III transition)	$	10,492
Adjustments related to capital components during transition(1)	(25		)
Common equity Tier 1 capital (Basel III fully phased-in)	$	10,467
Risk-weighted assets (Basel III fully phased-in)(2)	$	80,417
Common equity Tier 1 capital ratio (Basel III fully phased-in)	13.0		%

(1) Adjustments related to capital components for fully phased-in Basel III include the phase-in of the intangible asset exclusion.

(2) Key differences under fully phased-in Basel III rules in the calculation of risk-weighted assets include higher risk weighting for past-due loans and unfunded commitments.

Additionally, we are required to submit an annual capital plan to the Federal Reserve that includes an assessment of our expected uses and sources of capital over a nine quarter planning horizon. We submitted our annual capital plan to the Federal Reserve under the Federal Reserve’s CCAR program and received notice in June 2017 that the Federal Reserve does not object to our proposed capital plan, including planned quarterly capital distributions through June 30, 2018. Our ability to

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make capital distributions, including our ability to pay dividends on or repurchase shares of our common stock, will continue to be subject to the Federal Reserve’s review and non-objection of the actions that we propose each year in our annual capital plan.

Also in June 2017, the Federal Reserve published the results of its annual supervisory stress tests for bank holding companies with $50 billion or more in total consolidated assets, including Discover Financial Services. At that same time, we published company-run stress test results for Discover Financial Services and Discover Bank. Discover Financial Services is required to publish company-run stress tests results twice each year in accordance with Federal Reserve rules and Discover Bank is required to publish bank-run stress test results under FDIC rules.

We recently declared a quarterly cash dividend on our common stock of $0.35 per share, payable on September 7, 2017 to holders of record on August 24, 2017, which is an increase from $0.30 per share paid in each of the last four quarters. We also recently declared a quarterly cash dividend on our preferred stock of $16.25 per share, equal to $0.40625 per depositary share, payable on September 1, 2017, to holders of record on August 15, 2017, which was the same as the amount paid on our preferred stock in the prior quarter.

On July 25, 2017, our Board of Directors approved a share repurchase program authorizing the repurchase of up to $2.8 billion of our outstanding shares of common stock. The program expires on October 31, 2018 and may be terminated at any time. This program replaced the prior $2.5 billion share repurchase program, which had $562 million of remaining authorization. During the three months ended June 30, 2017, we repurchased approximately 7 million shares, or 2%, of our outstanding common stock for $450 million. We expect to continue to make share repurchases under our repurchase program from time to time based on market conditions and other factors, subject to legal and regulatory requirements and restrictions, including approval from the Federal Reserve described above. Share repurchases under the program may be made through a variety of methods, including open market purchases, privately negotiated transactions or other purchases, including block trades, accelerated share repurchase transactions, or any combination of such methods.

The amount and size of any future dividends and share repurchases will depend upon our results of operations, financial condition, capital levels, cash requirements, future prospects and other factors. The declaration and payment of future dividends, as well as the amount thereof, are subject to the discretion of our Board of Directors. Holders of our shares of common stock are subject to the prior dividend rights of holders of our preferred stock or the depositary shares representing such preferred stock outstanding, and if full dividends have not been declared and paid on all outstanding shares of preferred stock in any dividend period, no dividend may be declared or paid or set aside for payment on our common stock. In addition, as noted above, banking laws and regulations and our banking regulators may limit our ability to pay dividends and make share repurchases, including limitations on the extent to which our banking subsidiaries can provide funds to us through dividends, loans or otherwise. Further, also noted above, current or future regulatory initiatives may require us to hold more capital in the future. There can be no assurance that we will declare and pay any dividends or repurchase any shares of our common stock in the future.

Certain Off-Balance Sheet Arrangements

Guarantees

Guarantees are contracts or indemnification agreements that contingently require us to make payments to a guaranteed party based on changes in an underlying asset, liability, or equity security of a guaranteed party, rate or index. Also included in guarantees are contracts that contingently require the guarantor to make payments to a guaranteed party based on another entity’s failure to perform under an agreement. Our guarantees relate to transactions processed on the Discover Network and certain transactions processed by PULSE and Diners Club. See Note 11: Commitments, Contingencies and Guarantees to our condensed consolidated financial statements for further discussion regarding our guarantees.

Contractual Obligations and Contingent Liabilities and Commitments

In the normal course of business, we enter into various contractual obligations that may require future cash payments. Contractual obligations at June 30, 2017, which include deposits, long-term borrowings, operating and capital lease obligations, interest payments on fixed-rate debt, purchase obligations and other liabilities were $83.2 billion. For a description of our contractual obligations, see our annual report on Form 10-K for the year ended December 31, 2016 under “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Contractual Obligations and Contingent Liabilities and Commitments.”

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We extend credit for consumer loans, primarily arising from agreements with customers for unused lines of credit on certain credit cards, provided there is no violation of conditions established in the related agreement. At June 30, 2017, our unused commitments were approximately $184.3 billion. These commitments, substantially all of which we can terminate at any time and which do not necessarily represent future cash requirements, are periodically reviewed based on account usage, customer creditworthiness and loan qualification. In addition, in the ordinary course of business, we guarantee payment on behalf of subsidiaries relating to contractual obligations with external parties. The activities of the subsidiaries covered by any such guarantees are included in our condensed consolidated financial statements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk refers to the risk that a change in the level of one or more market prices, rates, indices, correlations or other market factors will result in losses for a position or portfolio. We are exposed to market risk primarily from changes in interest rates.

Interest Rate Risk

We borrow money from a variety of depositors and institutions in order to provide loans to our customers, as well as invest in other assets and our business. These loans and other assets earn interest, which we use to pay interest on the money borrowed. Our net interest income and, therefore, earnings, will be negatively affected if the interest rate earned on assets increases at a slower pace than increases to the interest rate we owe on our borrowings. Changes in interest rates and competitor responses to those changes may influence customer payment rates, loan balances or deposit account activity. We may face higher-cost alternative sources of funding as a result, which has the potential to decrease earnings.

Our interest rate risk management policies are designed to measure and manage the potential volatility of earnings that may arise from changes in interest rates by having a financing portfolio that reflects the mix of variable and fixed-rate assets. To the extent that asset and related financing repricing characteristics of a particular portfolio are not matched effectively, we may utilize interest rate derivative contracts, such as swap agreements, to achieve our objectives. Interest rate swap agreements effectively convert the underlying asset or liability from fixed to floating rate or from floating to fixed rate. See Note 14: Derivatives and Hedging Activities to our condensed consolidated financial statements for information on our derivatives activity.

We use an interest rate sensitivity simulation to assess our interest rate risk exposure. For purposes of presenting the possible earnings effect of a hypothetical, adverse change in interest rates over the 12-month period from our reporting date, we assume that all interest rate sensitive assets and liabilities will be impacted by a hypothetical, immediate 100 basis point increase in interest rates relative to market consensus expectations as of the beginning of the period. The sensitivity is based upon the hypothetical assumption that all relevant types of interest rates that affect our results would increase instantaneously, simultaneously and to the same degree.

Our interest rate sensitive assets include our variable rate loan receivables and the assets that make up our liquidity portfolio. We have restrictions on our ability to mitigate interest rate risk by adjusting rates on existing balances and competitive actions may restrict our ability to increase the rates that we charge to customers for new loans. At June 30, 2017, the majority of our credit card and student loans were at variable rates. Assets with rates that are fixed at period end but which will mature, or otherwise contractually reset to a market-based indexed rate or other fixed rate prior to the end of the 12-month period, are considered to be rate sensitive. The latter category includes certain revolving credit card loans that may be offered at below-market rates for an introductory period, such as balance transfers and special promotional programs, after which the loans will contractually reprice in accordance with our normal market-based pricing structure. For purposes of measuring rate sensitivity for such loans, only the effect of the hypothetical 100 basis point change in the underlying market-based indexed rate has been considered. For assets that have a fixed interest rate but which contractually will, or are assumed to, reset to a market-based indexed rate or other fixed rate during the next 12 months, earnings sensitivity is measured from the expected repricing date. In addition, for all interest rate sensitive assets, earnings sensitivity is calculated net of expected loan losses, which for purposes of this analysis are assumed to remain unchanged relative to our baseline expectations over the analysis horizon.

Interest rate sensitive liabilities are assumed to be those for which the stated interest rate is not contractually fixed for the next 12-month period. Thus, liabilities that vary with changes in a market-based index, such as Federal Funds or LIBOR, which will reset before the end of the 12-month period, or liabilities whose rates are fixed at the fiscal period end, but which will mature and are assumed to be replaced with a market-based indexed rate prior to the end of the 12-month period, also are

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considered to be rate sensitive. For these fixed-rate liabilities, earnings sensitivity is measured from the expected maturity date.

Net interest income sensitivity requires assumptions to be made regarding market conditions, consumer behavior, and the overall growth and composition of the balance sheet. These assumptions are inherently uncertain and, as a result, actual earnings may differ from the simulated earnings presented above. Our actual earnings are dependent on multiple factors including, but not limited to, the direction and timing of changes in interest rates, the movement of short-term versus long-term rates, balance sheet design, competitor actions, which may affect pricing decisions in our loans and deposits, and strategic actions undertaken by management.

Assuming an immediate 100 basis point increase in the interest rates affecting all interest rate sensitive assets and liabilities at June 30, 2017, we estimate that net interest income over the following 12-month period would increase by approximately $190 million, or 2%. Assuming an immediate 100 basis point increase in the interest rates affecting all interest rate sensitive assets and liabilities at December 31, 2016, we estimated that net interest income over the following 12-month period would increase by approximately $201 million, or 3%. Should an immediate 100 basis point interest rate decrease occur, we estimate that the impact would be approximately the opposite of the result of an immediate 100 basis point increase. However, at current interest rates there is a higher level of uncertainty in the assumptions used to derive this estimate because a decline of that magnitude would result in a near zero interest rate environment.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), which are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting (as such term is defined in Exchange Act Rule 13a-15(f) and 15d-15(f)) that occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II. OTHER INFORMATION

Item 1. Legal Proceedings

For a description of legal proceedings, see Note 12: Litigation and Regulatory Matters to our condensed consolidated financial statements.

Item 1A. Risk Factors

There have been no material changes to the risk factors disclosed in our annual report on Form 10-K for the year ended December 31, 2016.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The table below sets forth information regarding purchases of our common stock related to our share repurchase program and employee transactions that were made by us or on our behalf during the most recent quarter.
Period	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan or Program(1)	Maximum Dollar Value of Shares that may yet be purchased under the Plans or Programs (1)
April 1 - 30, 2017
Repurchase program(1)	2,160,830	$	66.49	2,160,830	$	868,283,316
Employee transactions(2)	—	$	—	N/A	N/A
May 1 - 31, 2017
Repurchase program(1)	2,720,004	$	60.88	2,720,004	$	702,676,053
Employee transactions(2)	1,796	$	62.80	N/A	N/A
June 1 - 30, 2017
Repurchase program(1)	2,345,576	$	59.99	2,345,576	$	561,959,418
Employee transactions(2)	314	$	58.91	N/A	N/A
Total
Repurchase program(1)	7,226,410	$	62.27	7,226,410	$	561,959,418
Employee transactions(2)	2,110	$	62.22	N/A	N/A

(1) On July 25, 2017, our board of directors approved a share repurchase program authorizing the purchase of up to $2.8 billion of our outstanding shares of common stock. This share repurchase program expires on October 31, 2018 and may be terminated at any time.

(2) Reflects shares withheld (under the terms of grants under employee stock compensation plans) to offset tax withholding obligations that occur upon the delivery of outstanding shares underlying restricted stock units or upon the exercise of stock options.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

Item 6. Exhibits

See "Exhibit Index" for documents filed herewith and incorporated herein by reference.

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Signature

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Discover Financial Services (Registrant)
By:	/s/ R. MARK GRAF
	R. Mark Graf Executive Vice President and Chief Financial Officer

Date: August 1, 2017

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Exhibit Index

Exhibit Number	Description
12.1	Statement regarding computation of ratio of earnings to fixed charges and computation of ratio of earnings to fixed charges and preferred stock dividends.
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
32.1	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

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EX-12.1

Exhibit 12.1

DISCOVER FINANCIAL SERVICES

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

(dollars in millions)

	For the Six Months Ended June 30,				For the Calendar Years Ended December 31,								For the Fiscal Year Ended November 30, 2012		For the One Month Ended December 31, 2012
	2017		2016		2016		2015		2014		2013
Earnings:
Income before income tax expense	$	1,735	$	1,812	$	3,656	$	3,612	$	3,694	$	3,944	$	3,753	$	274
Losses from unconsolidated investees	27		26		58		50		29		18		12		1
Total earnings	$	1,762	$	1,838	$	3,714	$	3,662	$	3,723	$	3,962	$	3,765	$	275
Fixed charges:(1)
Total interest expense	$	786	$	673	$	1,398	$	1,263	$	1,134	$	1,146	$	1,331	$	103
Interest factor in rents	2		3		5		6		5		5		6		1
Total fixed charges	$	788	$	676	$	1,403	$	1,269	$	1,139	$	1,151	$	1,337	$	104
Combined fixed charges and preferred stock dividends:(1)
Total interest expense	$	786	$	673	$	1,398	$	1,263	$	1,134	$	1,146	$	1,331	$	103
Interest factor in rents	2		3		5		6		5		5		6		1
Preferred stock dividends	30		28		57		59		60		60		—		—
Total combined fixed charges and preferred stock dividends	$	818	$	704	$	1,460	$	1,328	$	1,199	$	1,211	$	1,337	$	104
Earnings before income tax expense and fixed charges	$	2,550	$	2,514	$	5,117	$	4,931	$	4,862	$	5,113	$	5,102	$	379
Earnings before income tax expense and combined fixed charges and preferred stock dividends	$	2,580	$	2,542	$	5,174	$	4,990	$	4,922	$	5,173	$	5,102	$	379
Ratio of earnings to fixed charges	3.2		3.7		3.6		3.9		4.3		4.4		3.8		3.6
Ratio of earnings to combined fixed charges and preferred stock dividends	3.2		3.6		3.5		3.8		4.1		4.3		3.8		3.6

(1) Fixed charges are the sum of interest expensed, amortized premiums, discounts and capitalized expenses related to indebtedness, an estimate of interest within rental expense. Combined fixed charges and preferred stock requirements are the sum of interest expense, amortized premiums, discounts and capitalized expenses related to indebtedness, an estimate of interest within rental expense and preference security dividend requirements.

EX-31.1

Exhibit 31.1

CERTIFICATION

I, David W. Nelms, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Discover Financial Services (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 1, 2017

/s/ DAVID W. NELMS

David W. Nelms

Chairman of the Board and

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, R. Mark Graf, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Discover Financial Services (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 1, 2017

/s/ R. MARK GRAF

R. Mark Graf

Executive Vice President and

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Discover Financial Services (the “Company”) on Form 10-Q for the period ended June 30, 2017, as filed with the Securities and Exchange Commission (the “Report”), each of David W. Nelms, Chairman of the Board and Chief Executive Officer of the Company, and R. Mark Graf, Executive Vice President and Chief Financial Officer of the Company, certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 1, 2017

/s/ DAVID W. NELMS

David W. Nelms

Chairman of the Board and Chief Executive Officer

Date: August 1, 2017

/s/ R. MARK GRAF

R. Mark Graf

Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 28, 2017
Document Information [Line Items]
Document type	10-Q
Amendment flag	false
Document period end date	Jun. 30, 2017
Document fiscal year focus	2017
Document fiscal period focus	Q2
Entity registrant name	Discover Financial Services
Entity central index key	0001393612
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity common stock, shares outstanding		372,351,948

XML

Condensed Consolidated Statements of Financial Condition - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 12,950	$ 11,914
Restricted cash	93	95
Investment securities (includes $1,499 and $1,605 at fair value at June 30, 2017 and December 31, 2016, respectively)	1,679	1,757
Loan receivables
Loan receivables	77,997	77,254
Allowance for loan losses	(2,384)	(2,167)
Net loan receivables	75,613	75,087
Premises and equipment, net	774	734
Goodwill	255	255
Intangible assets, net	164	166
Other assets	2,229	2,300
Total assets	93,757	92,308
Deposits
Interest-bearing deposit accounts	52,359	51,461
Non-interest bearing deposit accounts	505	531
Total deposits	52,864	51,992
Long-term borrowings	26,438	25,443
Accrued expenses and other liabilities	3,196	3,550
Total liabilities	82,498	80,985
Commitments, contingencies and guarantees (Notes 8, 11 and 12)
Stockholders’ Equity:
Common stock, par value $0.01 per share; 2,000,000,000 shares authorized; 563,441,961 and 562,414,040 shares issued at June 30, 2017 and December 31, 2016, respectively	6	5
Preferred stock, par value $0.01 per share; 200,000,000 shares authorized; 575,000 shares issued and outstanding and aggregate liquidation preference of $575 at June 30, 2017 and December 31, 2016	560	560
Additional paid-in capital	3,997	3,962
Retained earnings	15,989	15,130
Accumulated other comprehensive loss	(150)	(161)
Treasury stock, at cost; 188,278,530 and 173,648,023 shares at June 30, 2017 and December 31, 2016, respectively	(9,143)	(8,173)
Total stockholders’ equity	11,259	11,323
Total liabilities and stockholders’ equity	93,757	92,308
Variable Interest Entity, Primary Beneficiary [Member]
Assets
Restricted cash	93	95
Loan receivables
Loan receivables	31,356	33,016
Allowance for loan losses	(995)	(955)
Other assets	5	4
Deposits
Long-term borrowings	16,738	16,411
Accrued expenses and other liabilities	$ 15	$ 15

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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)		Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Amount of total investment securities at fair value (in dollars)	[1]	$ 1,499,000,000	$ 1,605,000,000
Common stock, par value per share (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized		2,000,000,000	2,000,000,000
Common stock, shares issued		563,441,961	562,414,040
Preferred stock, par or stated value per share (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares authorized		200,000,000	200,000,000
Preferred stock, shares issued		575,000	575,000
Preferred stock, shares outstanding		575,000	575,000
Preferred stock, liquidation preference (in dollars)		$ 575,000,000	$ 575,000,000
Treasury stock, shares		188,278,530	173,648,023

[1] Available-for-sale investment securities are reported at fair value.

XML

Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Credit card loans	$ 1,916	$ 1,734	$ 3,792	$ 3,467
Other loans	379	331	746	657
Investment securities	7	10	14	21
Other interest income	36	15	64	29
Total interest income	2,338	2,090	4,616	4,174
Interest expense
Deposits	199	166	390	328
Long-term borrowings	201	173	396	345
Total interest expense	400	339	786	673
Net interest income	1,938	1,751	3,830	3,501
Provision for loan losses	640	412	1,226	836
Net interest income after provision for loan losses	1,298	1,339	2,604	2,665
Other income
Discount and interchange revenue, net	278	265	511	538
Protection products revenue	56	59	114	120
Loan fee income	83	79	172	159
Transaction processing revenue	42	39	81	75
Other income	22	23	50	47
Total other income	481	465	928	939
Other expense
Employee compensation and benefits	367	340	730	685
Marketing and business development	192	198	360	360
Information processing and communications	77	89	157	177
Professional fees	156	150	303	310
Premises and equipment	23	23	48	47
Other expense	97	106	199	213
Total other expense	912	906	1,797	1,792
Income before income tax expense	867	898	1,735	1,812
Income tax expense	321	282	625	621
Net income	546	616	1,110	1,191
Net income allocated to common stockholders	$ 532	$ 602	$ 1,083	$ 1,164
Basic earnings per common share (in dollars per share)	$ 1.41	$ 1.47	$ 2.83	$ 2.81
Diluted earnings per common share (in dollars per share)	1.40	1.47	2.83	2.81
Dividends declared per common share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.58

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 546	$ 616	$ 1,110	$ 1,191
Other comprehensive income (loss), net of taxes
Unrealized gain on available-for-sale investment securities, net of tax	0	4	1	18
Unrealized gain (loss) on cash flow hedges, net of tax	5	(6)	10	(32)
Other comprehensive income (loss)	5	(2)	11	(14)
Comprehensive income	$ 551	$ 614	$ 1,121	$ 1,177

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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Preferred stock, shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2015		575,000
Common stock, shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2015			560,679,000
Stockholders' equity, balance at beginning of period at Dec. 31, 2015	$ 11,275	$ 560	$ 5	$ 3,885	$ 13,250	$ (160)	$ (6,265)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,191				1,191
Other comprehensive income (loss)	(14)					(14)
Purchases of treasury stock	(849)						(849)
Common stock issued under employee benefit plans (in shares)			45,000
Common stock issued under employee benefit plans	2		$ 0	2
Common stock issued and stock-based compensation expense (in shares)			1,631,000
Common stock issued and stock-based compensation expense	45		$ 0	45
Dividends — common stock	(234)				(234)
Dividends — preferred stock	(19)				(19)
Preferred stock, shares outstanding, balance at end of period (in shares) at Jun. 30, 2016		575,000
Common stock, shares outstanding, balance at end of period (in shares) at Jun. 30, 2016			562,355,000
Stockholders' equity, balance at end of period at Jun. 30, 2016	$ 11,397	$ 560	$ 5	3,932	14,188	(174)	(7,114)
Preferred stock, shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2016	575,000	575,000
Common stock, shares outstanding, balance at beginning of period (in shares) at Dec. 31, 2016			562,414,000
Stockholders' equity, balance at beginning of period at Dec. 31, 2016	$ 11,323	$ 560	$ 5	3,962	15,130	(161)	(8,173)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,110				1,110
Other comprehensive income (loss)	11					11
Purchases of treasury stock	(970)						(970)
Common stock issued under employee benefit plans (in shares)			40,000
Common stock issued under employee benefit plans	3		$ 0	3
Common stock issued and stock-based compensation expense (in shares)			988,000
Common stock issued and stock-based compensation expense	33		$ 1	32
Dividends — common stock	(232)				(232)
Dividends — preferred stock	$ (19)				(19)
Preferred stock, shares outstanding, balance at end of period (in shares) at Jun. 30, 2017	575,000	575,000
Common stock, shares outstanding, balance at end of period (in shares) at Jun. 30, 2017			563,442,000
Stockholders' equity, balance at end of period at Jun. 30, 2017	$ 11,259	$ 560	$ 6	$ 3,997	$ 15,989	$ (150)	$ (9,143)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 1,110	$ 1,191
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,226	836
Deferred income taxes	(46)	121
Depreciation and amortization	188	176
Amortization of deferred revenues and accretion of accretable yield on acquired loans	(195)	(198)
Net loss investments and other assets	27	26
Other, net	33	39
Changes in assets and liabilities:
Decrease in other assets	3	89
Decrease in accrued expenses and other liabilities	(314)	(464)
Net cash provided by operating activities	2,032	1,816
Cash flows from investing activities
Purchases of other short-term investments	0	(1,050)
Maturities of available-for-sale investment securities	104	671
Maturities of held-to-maturity investment securities	7	9
Purchases of held-to-maturity investment securities	(36)	(46)
Net principal disbursed on loans originated for investment	(1,550)	(83)
Proceeds from returns of investment	14	0
Purchases of other investments	(23)	(12)
Increase in restricted cash	2	1
Purchases of premises and equipment	(103)	(86)
Net cash used for investing activities	(1,585)	(596)
Cash flows from financing activities
Proceeds from issuance of securitized debt	2,952	1,833
Maturities and repayment of securitized debt	(2,651)	(1,966)
Proceeds from issuance of other long-term borrowings	1,050	73
Maturities and repayment of other long-term borrowings	(401)	0
Proceeds from issuance of common stock	2	5
Purchases of treasury stock	(970)	(849)
Net increase in deposits	858	983
Dividends paid on common and preferred stock	(251)	(254)
Net cash provided by (used for) financing activities	589	(175)
Net increase in cash and cash equivalents	1,036	1,045
Cash and cash equivalents, at beginning of period	11,914	9,572
Cash and cash equivalents, at end of period	$ 12,950	$ 10,617

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Background and Basis of Presentation

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Background and Basis of Presentation

Background and Basis of Presentation

Description of Business

Discover Financial Services (“DFS” or the “Company”) is a direct banking and payment services company. The Company is a bank holding company under the Bank Holding Company Act of 1956 as well as a financial holding company under the Gramm-Leach-Bliley Act and therefore is subject to oversight, regulation and examination by the Board of Governors of the Federal Reserve System (the “Federal Reserve”). The Company provides direct banking products and services and payment services through its subsidiaries. The Company offers its customers credit card loans, private student loans, personal loans, home equity loans and deposit products. The Company also operates the Discover Network, the PULSE network (“PULSE”) and Diners Club International (“Diners Club”). The Discover Network processes transactions for Discover-branded credit cards and provides payment transaction processing and settlement services. PULSE operates an electronic funds transfer network, providing financial institutions issuing debit cards on the PULSE network with access to ATMs domestically and internationally, as well as point-of-sale terminals at retail locations throughout the U.S. for debit card transactions. Diners Club is a global payments network of licensees, which are generally financial institutions, that issue Diners Club branded charge cards and/or provide card acceptance services.

The Company’s business segments are Direct Banking and Payment Services. The Direct Banking segment includes Discover-branded credit cards issued to individuals on the Discover Network and other consumer products and services, including private student loans, personal loans, home equity loans, and other consumer lending and deposit products. The majority of Direct Banking revenues relate to interest income earned on the segment's loan products. Additionally, the Company's credit card products generate substantially all revenues related to discount and interchange, protection products and loan fee income.

The Payment Services segment includes PULSE, an automated teller machine, debit and electronic funds transfer network; Diners Club, a global payments network; and the Company’s Network Partners business, which provides payment transaction processing and settlement services on the Discover Network. The majority of Payment Services revenues relate to transaction processing revenue from PULSE and royalty and licensee revenue from Diners Club.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, the financial statements reflect all adjustments which are necessary for a fair presentation of the results for the interim period. All such adjustments are of a normal, recurring nature. The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and related disclosures. These estimates are based on information available as of the date of the condensed consolidated financial statements. The Company believes that the estimates used in the preparation of the condensed consolidated financial statements are reasonable. Actual results could differ from these estimates. These interim condensed consolidated financial statements should be read in conjunction with the Company’s 2016 audited consolidated financial statements filed with the Company’s annual report on Form 10-K for the year ended December 31, 2016.

Recently Issued Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The purpose of this ASU is to simplify the test for goodwill impairment by eliminating Step 2 of the current impairment test. Under the current rules, if the reporting unit’s carrying value exceeds its fair value (Step 1), goodwill impairment is measured as the difference between the carrying value of goodwill and its implied fair value. To compute the implied fair value of goodwill under Step 2, an entity has to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Under the new standard, the Company will perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The Company should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The amendments in this ASU apply to the Company’s annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The amendments in this ASU apply on a prospective basis. All of the Company’s recorded goodwill is associated with its PULSE debit business. This ASU has no impact on cash flows, and its adoption is not expected to have any impact on the Company’s financial condition or results of operations because the estimated fair value of the PULSE reporting unit is well in excess of its carrying value. The Company has not elected to early adopt this amendment.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Whereas restricted cash balances have traditionally been excluded from the statement of cash flows, this ASU requires restricted cash and restricted cash equivalents to be included within the beginning and ending totals of cash, cash equivalents and restricted cash presented on the statement of cash flows for all periods presented. Restricted cash and restricted cash equivalent inflows and outflows with external parties are required to be classified within the operating, investing, and/or financing activity sections of the statement of cash flows whereas transfers between cash and cash equivalents and restricted cash and restricted cash equivalents should no longer be presented on the statement of cash flows. ASU 2016-18 also requires the nature of the restrictions to be disclosed to help provide information about the sources and uses of these balances during a reporting period and a reconciliation of the cash, cash equivalents and restricted cash totals on the statement of cash flows to the related balance sheet line items when cash, cash equivalents, and restricted cash are presented in more than one line item on the balance sheet. The reconciliation can be presented either on the face of the statement of cash flows or in the notes to the financial statements and must be provided for each period that a balance sheet is presented. The ASU will become effective for the Company on January 1, 2018, with early adoption permitted, and is not expected to have a material impact to the Company’s statement of cash flows. The Company has not elected to early adopt this amendment.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU eliminates the incurred loss threshold for initial recognition of credit impairment in current GAAP and replaces it with the expected loss concept. For all loans carried at amortized cost, companies will be required to measure their allowance for loan losses based on management’s current estimate of all expected credit losses over the remaining contractual term of the assets. Because it eliminates the incurred loss trigger, the new accounting guidance will require companies, upon the origination of a loan, to record their estimate of all expected credit losses on that loan through an immediate charge to earnings. Updates to that estimate each period will be recorded through provision expense. The estimate of loan losses must be based on historical experience, current conditions and reasonable and supportable forecasts. The ASU does not mandate the use of any specific method for estimating credit loss, permitting companies to use judgment in selecting the approach that is most appropriate in their circumstances.

The new rules are expected to affect the Company’s allowance for loan losses as a result of: (1) the requirement to measure the allowance based on all losses expected to occur over the remaining life of the loans receivable rather than including only losses deemed to be related to a past event or current condition, and (2) the reclassification of the non-accretable credit adjustment, currently embedded in the Company’s purchased credit-impaired ("PCI") student loan portfolio, into the allowance for loan losses. The separate measurement guidance applicable today for loans modified in a troubled debt restructuring will also be affected. Both troubled debt restructurings and PCI assets, which the ASU refers to as purchased credit-deteriorated ("PCD") will still be subject to certain separate disclosure requirements. Measurement of credit impairment of available-for-sale debt securities will generally remain unchanged under the new rules, but any such impairment will be recorded through an allowance, rather than a direct write-down of the security.

The ASU will become effective for the Company on January 1, 2020, with early adoption permitted no sooner than January 1, 2019. Upon adoption, a cumulative effect adjustment to retained earnings will be recorded as of the beginning of the first reporting period in which the guidance is effective in an amount necessary to adjust the allowance for loan losses to equal the current estimate of expected losses on financial assets held at that date. Additionally, upon adoption, the carrying value of PCD loans will be increased through an offsetting addition to the allowance for loan losses for the amount of expected credit losses on those loans, to be re-evaluated in subsequent periods and adjusted through provision expense as needed, and any non-credit premium or discount will be amortized or accreted to interest income from that point forward over the remaining life of PCD loans. Management is evaluating the standard, initiating implementation efforts across the Company, and planning for loss modeling requirements consistent with lifetime expected loss estimates. The Company has also been involved in efforts to identify and resolve various implementation issues specific to the application of the standard to credit card receivables. Adoption of the standard could have a potentially material impact on how the Company records and reports its financial condition and results of operations, and on regulatory capital. The extent of the impact upon adoptionwill likely depend on the characteristics of the Company's loan portfolio and economic conditions at that date, as well as forecasted conditions thereafter.

In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The guidance in this ASU provides clarification on the principal versus agent concept in relation to revenue recognition guidance issued as part of ASU 2014-09, Revenue from Contracts with Customers (Topic 606). Topic 606 requires a company to determine whether it is a principal or an agent in a transaction in which another party is involved in providing goods or services to a customer by evaluating the nature of its promise to the customer. ASU 2016-08 provides clarification for identifying the good, service or right being transferred in a revenue transaction and identifies the principal as the party that controls the good, service or right prior to its transfer to the customer. The ASU provides further clarity on how to evaluate control in this context. This guidance will become effective for the Company on January 1, 2018 and management is evaluating the impact of these changes as part of its overall evaluation of ASU 2014-09, discussed below. Based on its evaluations to date, management does not anticipate that this ASU will result in different conclusions regarding the Company's revenue arrangements that involve a principal-agent relationship, but any such changes that could occur would result only in classification differences on the statements of income with no impact on income before taxes, net income, financial condition or cash flows.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The guidance will require lessees to capitalize most leases on their balance sheet whereas under current GAAP only capital leases are recognized on the lessee’s balance sheet. Leases which today are identified as capital leases will generally be identified as financing leases under the new guidance but otherwise their accounting treatment will remain relatively unchanged. Leases identified today as operating leases will generally remain in that category under the new standard, but both a right-of-use asset and a liability for remaining lease payments will now be required to be recognized on the balance sheet for this type of lease. The manner in which expenses associated with all leases are reported on the income statement will remain mostly unchanged. Lessor accounting also remains substantially unchanged by the new standard. The new guidance will become effective for the Company on January 1, 2019, and management does not expect it to have a material impact on the condensed consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU will have limited impact on the Company since it does not change the guidance for classifying and measuring investments in debt securities or loans. The standard requires entities to measure certain cost-method equity investments at fair value with changes in value recognized in net income. Equity investments that do not have readily determinable fair values will be carried at cost, less any impairment, plus or minus changes resulting from any observable price changes in orderly transactions for an identical or similar investment of the same issuer. This ASU requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans) on the balance sheet or the accompanying notes to the financial statements. This ASU will become effective for the Company on January 1, 2018 and is not expected to have a material impact to the financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance in this ASU supersedes existing revenue recognition requirements in Topic 605, Revenue Recognition, including an assortment of transaction-specific and industry-specific rules. The new revenue recognition model will become effective for the Company on January 1, 2018.

This ASU establishes a principles-based model under which revenue from a contract is allocated to the distinct performance obligations within the contract and recognized in income as each performance obligation is satisfied. ASU Topic 606 does not apply to rights or obligations associated with financial instruments (for example, interest income from loans or investments, or interest expense on debt), and therefore the Company’s net interest income should not be affected. The Company’s revenue from discount and interchange, protection products, transaction processing and certain fees are within the scope of these rules. Management has followed the discussions of the FASB subsequent to the issuance of the ASU, and evaluated the conclusions published by its Transition Resource Group ("TRG"), specifically those pertaining to how the new revenue recognition rules should be interpreted for credit card arrangements, loyalty programs, and transaction processing arrangements. Those discussions support the conclusion that timing and measurement of fee revenues associated with the Company’s credit card arrangements and costs associated with the Company’s credit card reward programs will not be impacted by the new rules. The FASB TRG discussions and guidance also support the conclusion that the timing and measurement of revenue associated with the Company’s transaction processing services, including discount and interchange and other transaction processing fees, will remain substantially unchanged under the new accounting model. This conclusion covers the vast majority of the Company’s revenue that is within the scope of the new standard.

Upon adoption in 2018, the Company will record an adjustment, if needed, to retained earnings as of the beginning of the year of initial application, which can be either the earliest comparative period presented, with all periods presented under the new rules, or January 1, 2018, without restating prior periods presented. While management continues to evaluate the remaining in-scope revenue items to determine what, if any, impact the rules will have on their accounting and reporting, no material impacts are expected. At this time, management does not anticipate a restatement of prior period amounts when the standard becomes effective.

Business Dispositions

On June 16, 2015, the Company announced the closing of the mortgage origination business it acquired in 2012, which was part of its Direct Banking segment. The disposition represented the exiting of an ancillary business and did not have a major impact on the Company’s operations.

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Investments

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

The Company’s investment securities consist of the following (dollars in millions):
	June 30, 2017		December 31, 2016
U.S. Treasury securities(1)	$	672	$	674
States and political subdivisions of states	1		2
Residential mortgage-backed securities - Agency(2)	1,006		1,081
Total investment securities	$	1,679	$	1,757

(1) Includes $37 million and $73 million of U.S. Treasury securities pledged as swap collateral as of June 30, 2017 and December 31, 2016, respectively.

(2) Consists of residential mortgage-backed securities issued by Fannie Mae, Freddie Mac and Ginnie Mae.

The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale and held-to-maturity investment securities are as follows (dollars in millions):
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At June 30, 2017
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(4	)	$	672
Residential mortgage-backed securities - Agency	827		3		(3		)	827
Total available-for-sale investment securities	$	1,503	$	3	$	(7	)	$	1,499
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	1	$	—	$	—		$	1
Residential mortgage-backed securities - Agency(3)	179		1		(1		)	179
Total held-to-maturity investment securities	$	180	$	1	$	(1	)	$	180
At December 31, 2016
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(2	)	$	674
Residential mortgage-backed securities - Agency	934		2		(5		)	931
Total available-for-sale investment securities	$	1,610	$	2	$	(7	)	$	1,605
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	2	$	—	$	—		$	2
Residential mortgage-backed securities - Agency(3)	150		1		(1		)	150
Total held-to-maturity investment securities	$	152	$	1	$	(1	)	$	152

(1) Available-for-sale investment securities are reported at fair value.

(2) Held-to-maturity investment securities are reported at amortized cost.

(3) Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.

The following table provides information about investment securities with aggregate gross unrealized losses and the length of time that individual investment securities have been in a continuous unrealized loss position (dollars in millions):
	Number of Securities in a Loss Position	Less than 12 months					More than 12 months
		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At June 30, 2017
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	672	$	(4	)	$	—	$	—
Residential mortgage-backed securities - Agency	15	$	376	$	(2	)	$	46	$	(1	)
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	38	$	88	$	(1	)	$	—	$	—
At December 31, 2016
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	674	$	(2	)	$	—	$	—
Residential mortgage-backed securities - Agency	19	$	586	$	(5	)	$	—	$	—
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	31	$	61	$	(1	)	$	—	$	—

There were no losses related to other-than-temporary impairments during the three and six months ended June 30, 2017 and 2016.

The following table provides information about proceeds from sales, recognized gains and losses and net unrealized gains and losses on available-for-sale securities (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Net unrealized gain recorded in other comprehensive income, before-tax	$	—	$	6	$	2	$	29
Net unrealized gain recorded in other comprehensive income, after-tax	$	—	$	4	$	1	$	18

Maturities of available-for-sale debt securities and held-to-maturity debt securities are provided in the table below (dollars in millions):
	One Year or Less		After One Year Through Five Years		After Five Years Through Ten Years		After Ten Years		Total
At June 30, 2017
Available-for-Sale Investment Securities—Amortized Cost
U.S. Treasury securities	$	—	$	676	$	—	$	—	$	676
Residential mortgage-backed securities - Agency	—		73		560		194		827
Total available-for-sale investment securities	$	—	$	749	$	560	$	194	$	1,503
Held-to-Maturity Investment Securities—Amortized Cost
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180
Available-for-Sale Investment Securities—Fair Values
U.S. Treasury securities	$	—	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		73		559		195		827
Total available-for-sale investment securities	$	—	$	745	$	559	$	195	$	1,499
Held-to-Maturity Investment Securities—Fair Values
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180

Other Investments

As a part of the Company's community reinvestment initiatives, the Company has made equity investments in certain limited partnerships and limited liability companies that finance the construction and rehabilitation of affordable rental housing, as well as stimulate economic development in low to moderate income communities. These investments are accounted for using the equity method of accounting and are recorded within other assets. The related commitment for future investments is recorded in accrued expenses and other liabilities within the condensed consolidated statements of financial condition. The portion of each investment's operating results allocable to the Company is recorded in other expense within the condensed consolidated statements of income. The Company earns a return primarily through the receipt of tax credits allocated to the affordable housing projects and the community revitalization projects. These investments are not consolidated as the Company does not have a controlling financial interest in the entities. As of June 30, 2017 and December 31, 2016, the Company had outstanding investments in these entities of $332 million and $326 million, respectively, and related contingent liabilities of $74 million and $64 million, respectively. Of the above outstanding equity investments, the Company had $290 million and $270 million of investments related to affordable housing projects as of June 30, 2017 and December 31, 2016, respectively, which had $74 million and $64 million related contingent liabilities, respectively.

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Loan Receivables

6 Months Ended

Jun. 30, 2017

Loans and Leases Receivable Disclosure [Abstract]

Loan Receivables

Loan Receivables

The Company has three loan portfolio segments: credit card loans, other loans and PCI loans.

The Company's classes of receivables within the three portfolio segments are depicted in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Loan receivables
Credit card loans(1)	$	61,797		$	61,522
Other loans
Personal loans	6,955			6,481
Private student loans	6,594			6,393
Other	329			274
Total other loans	13,878			13,148
PCI loans(2)	2,322			2,584
Total loan receivables	77,997			77,254
Allowance for loan losses	(2,384		)	(2,167		)
Net loan receivables	$	75,613		$	75,087

(1) Amounts include $21.2 billion and $20.8 billion underlying investors’ interest in trust debt at June 30, 2017 and December 31, 2016, respectively, and $8.9 billion and $10.8 billion in seller's interest at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

(2) Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

Credit Quality Indicators

The Company regularly reviews its collection experience (including delinquencies and net charge-offs) in determining its allowance for loan losses.

Information related to the delinquent and non-accruing loans in the Company’s loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading “— Purchased Credit-Impaired Loans” (dollars in millions):
	30-89 Days Delinquent		90 or More Days Delinquent		Total Past Due		90 or More Days Delinquent and Accruing		Total Non-accruing(1)
At June 30, 2017
Credit card loans(2)	$	634	$	603	$	1,237	$	540	$	206
Other loans
Personal loans(3)	57		21		78		20		10
Private student loans (excluding PCI)(4)	98		42		140		42		—
Other	1		1		2		—		10
Total other loans (excluding PCI)	156		64		220		62		20
Total loan receivables (excluding PCI)	$	790	$	667	$	1,457	$	602	$	226
At December 31, 2016
Credit card loans(2)	$	655	$	597	$	1,252	$	544	$	189
Other loans
Personal loans(3)	55		19		74		18		8
Private student loans (excluding PCI)(4)	106		35		141		35		—
Other	1		1		2		—		19
Total other loans (excluding PCI)	162		55		217		53		27
Total loan receivables (excluding PCI)	$	817	$	652	$	1,469	$	597	$	216

(1) The Company estimates that the gross interest income that would have been recorded in accordance with the original terms of non-accruing credit card loans was $9 million and $7 million for the three months ended June 30, 2017 and 2016, respectively, and $17 million and $15 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not separately track the amount of gross interest income that would have been recorded in accordance with the original terms of loans. This amount was estimated based on customers' current balances and most recent interest rates.

(2) Credit card loans that are 90 or more days delinquent and accruing interest include $61 million and $58 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(3) Personal loans that are 90 or more days delinquent and accruing interest include $3 million and $2 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(4) Private student loans that are 90 or more days delinquent and accruing interest include $5 million and $3 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016.

Information related to the net charge-offs in the Company's loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading "— Purchased Credit-Impaired Loans" (dollars in millions):
	For the Three Months Ended June 30,
	2017				2016
	Net Charge-offs		Net  Charge-off Rate(1)		Net Charge-offs		Net  Charge-off Rate(1)
Credit card loans	$	445	2.94	%	$	334	2.39	%
Other loans
Personal loans	54		3.18	%	33		2.38	%
Private student loans (excluding PCI)	20		1.15	%	17		1.10	%
Other	1		0.30	%	—		—	%
Total other loans	75		2.14	%	50		1.68	%
Net charge-offs (excluding PCI)	$	520	2.79	%	$	384	2.27	%
Net charge-offs (including PCI)	$	520	2.71	%	$	384	2.18	%
	For the Six Months Ended June 30,
	2017				2016
	Net Charge-off Dollars		Net  Charge-off Rate(1)		Net Charge-off Dollars		Net  Charge-off Rate(1)
Credit card loans	$	867	2.89	%	$	660	2.37	%
Other loans
Personal loans	105		3.17	%	67		2.41	%
Private student loans (excluding PCI)	34		0.99	%	29		0.98	%
Other	3		1.79	%	—		—	%
Total other loans	142		2.08	%	96		1.64	%
Net charge-offs (excluding PCI)	$	1,009	2.74	%	$	756	2.24	%
Net charge-offs (including PCI)	$	1,009	2.65	%	$	756	2.15	%

(1) Net charge-off rate represents net charge-off dollars (annualized) divided by average loans for the reporting period.

As part of credit risk management activities, on an ongoing basis, the Company reviews information related to the performance of a customer’s account with the Company as well as information from credit bureaus, such as FICO or other credit scores, relating to the customer’s broader credit performance. FICO scores are generally obtained at origination of the account and are refreshed monthly or quarterly thereafter to assist in predicting customer behavior. Historically, the Company has noted that a significant portion of delinquent accounts have FICO scores below 660.

The following table provides the most recent FICO scores available for the Company’s customers as a percentage of each class of loan receivables:
	Credit Risk Profile by FICO Score
	660 and  Above		Less than 660 or No Score
At June 30, 2017
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	96	%	4	%
At December 31, 2016
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	95	%	5	%

(1) PCI loans are discussed under the heading "— Purchased Credit-Impaired Loans."

For private student loans, additional credit risk management activities include monitoring the amount of loans in forbearance. Forbearance allows borrowers experiencing temporary financial difficulties and willing to make payments, the ability to temporarily suspend payments. Eligible borrowers have a lifetime cap on forbearance of 12 months. At June 30, 2017 and December 31, 2016, there were $28 million and $19 million, respectively, of private student loans, including PCI, in forbearance, representing 0.5% and 0.3%, respectively, of total student loans in repayment and forbearance.

Allowance for Loan Losses

The following tables provide changes in the Company’s allowance for loan losses (dollars in millions):
	For the Three Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,892		$	207		$	156		$	9		$	2,264
Additions
Provision for loan losses	533			82			23			2			640
Deductions
Charge-offs	(561		)	(61		)	(22		)	(1		)	(645		)
Recoveries	116			7			2			—			125
Net charge-offs	(445		)	(54		)	(20		)	(1		)	(520		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Three Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,590		$	165		$	148		$	18		$	1,921
Additions
Provision for loan losses	347			44			20			1			412
Deductions
Charge-offs	(448		)	(38		)	(19		)	—			(505		)
Recoveries	114			5			2			—			121
Net charge-offs	(334		)	(33		)	(17		)	—			(384		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949
	For the Six Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,790		$	200		$	158		$	19		$	2,167
Additions
Provision for loan losses	1,057			140			35			(6		)	1,226
Deductions
Charge-offs	(1,096		)	(118		)	(39		)	(3		)	(1,256		)
Recoveries	229			13			5			—			247
Net charge-offs	(867		)	(105		)	(34		)	(3		)	(1,009		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Six Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,554		$	155		$	143		$	17		$	1,869
Additions
Provision for loan losses	709			88			37			2			836
Deductions
Charge-offs	(887		)	(77		)	(34		)	—			(998		)
Recoveries	227			10			5			—			242
Net charge-offs	(660		)	(67		)	(29		)	—			(756		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949

(1) Includes both PCI and non-PCI private student loans.

Net charge-offs of principal are recorded against the allowance for loan losses, as shown in the preceding table. Information regarding net charge-offs of interest and fee revenues on credit card and other loans is as follows (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Interest and fees accrued subsequently charged off, net of recoveries (recorded as a reduction of interest income)	$	87	$	67	$	171	$	136
Fees accrued subsequently charged off, net of recoveries (recorded as a reduction to other income)	$	23	$	17	$	45	$	34

The following tables provide additional detail of the Company’s allowance for loan losses and recorded investment in its loan portfolio by impairment methodology (dollars in millions):
	Credit Card		Personal Loans		Student Loans(1)		Other Loans		Total
At June 30, 2017
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,789	$	210	$	106	$	3	$	2,108
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	191		25		20		7		243
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		33		—		33
Total allowance for loan losses	$	1,980	$	235	$	159	$	10	$	2,384
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,649	$	6,863	$	6,479	$	283	$	74,274
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,148		92		115		46		1,401
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,322		—		2,322
Total recorded investment	$	61,797	$	6,955	$	8,916	$	329	$	77,997
At December 31, 2016
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,623	$	179	$	105	$	3	$	1,910
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	167		21		18		16		222
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		35		—		35
Total allowance for loan losses	$	1,790	$	200	$	158	$	19	$	2,167
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,437	$	6,400	$	6,307	$	219	$	73,363
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,085		81		86		55		1,307
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,584		—		2,584
Total recorded investment	$	61,522	$	6,481	$	8,977	$	274	$	77,254

(1) Includes both PCI and non-PCI private student loans.

(2) Loan receivables evaluated for impairment in accordance with Accounting Standards Codification ("ASC") 310-10-35 include credit card loans, personal loans and student loans collectively evaluated for impairment in accordance with ASC Subtopic 310-40, Receivables, which consists of modified loans accounted for as troubled debt restructurings. Other loans are individually evaluated for impairment and generally do not represent troubled debt restructurings.

(3) The unpaid principal balance of credit card loans was $994 million and $935 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of personal loans was $91 million and $79 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of student loans was $113 million and $84 million at June 30, 2017 and December 31, 2016, respectively. All loans accounted for as troubled debt restructurings have a related allowance for loan losses.

Troubled Debt Restructurings

The Company has internal loan modification programs that provide relief to credit card, personal loan and student loan borrowers who are experiencing financial hardship. The internal loan modification programs include both temporary and permanent programs which vary by product. External loan modification programs are also available for credit card and personal loans. Temporary and permanent modifications on credit card and personal loans, as well as temporary modifications on student loans and certain grants of student loan forbearance, result in the loans being considered individually impaired. In addition, loans that defaulted or graduated from modification programs or forbearance are considered to be individually impaired.

For credit card customers, the temporary hardship program primarily consists of a reduced minimum payment and an interest rate reduction, both lasting for a period no longer than 12 months. The permanent workout program involves changing the structure of the loan to a fixed payment loan with a maturity no longer than 60 months and reducing the interest rate on the loan. The permanent modification program does not normally provide for the forgiveness of unpaid principal, but may allow for the reversal of certain unpaid interest or fee assessments. The Company also makes permanent loan modifications for customers who request financial assistance through external sources, such as a consumer credit counseling agency program. These loans typically receive a reduced interest rate but continue to be subject to the original minimum payment terms and do not normally include waiver of unpaid principal, interest or fees. Credit card loans included in temporary and permanent programs are accounted for as troubled debt restructurings.

For personal loan customers, in certain situations the Company offers various payment programs, including temporary and permanent programs. The temporary programs normally consist of a reduction of the minimum payment for a period of no longer than 12 months with the option of a final balloon payment required at the end of the loan term or an extension of the maturity date with the total term not exceeding nine years. Further, in certain circumstances the interest rate on the loan is reduced. The permanent program involves changing the terms of the loan in order to pay off the outstanding balance over a longer term and also in certain circumstances reducing the interest rate on the loan. Similar to the temporary programs, the total term may not exceed nine years. The Company also allows permanent loan modifications for customers who request financial assistance through external sources, similar to the credit card customers discussed above. Payments are modified based on the new terms agreed upon with the credit counseling agency. Personal loans included in temporary and permanent programs are accounted for as troubled debt restructurings.

To assist student loan borrowers who are experiencing temporary financial difficulties but are willing to resume making payments, the Company may offer hardship forbearance or programs that include payment deferral, temporary payment reduction, temporary interest rate reduction or extended terms. A modified loan typically meets the definition of a troubled debt restructuring based on the cumulative length of the concession period and an evaluation of the credit quality of the borrower, based on FICO scores. Prior to the third quarter of 2016, only a second forbearance when the borrower was 30 days or greater delinquent was considered a troubled debt restructuring. As a result, the student loan balances being accounted for as troubled debt restructurings increased, although it did not lead to significant changes in the balance of the overall allowance for loan losses.

The Company monitors borrower performance after using payment programs or forbearance and the Company believes the programs help to prevent defaults and are useful in assisting customers experiencing financial difficulties. The Company plans to continue to use payment programs and forbearance and, as a result, expects to have additional loans classified as troubled debt restructurings in the future.

Additional information about modified loans classified as troubled debt restructurings is shown below (dollars in millions):
	Average recorded investment in loans		Interest income recognized during period loans were impaired(1)		Gross interest income that would have been recorded with original terms(2)
For the Three Months Ended June 30, 2017
Credit card loans(3)	$	1,137	$	25	$	22
Personal loans	$	90	$	3	$	1
Private student loans(4)	$	107	$	1	$	—
For the Three Months Ended June 30, 2016
Credit card loans(3)	$	1,016	$	22	$	19
Personal loans	$	71	$	2	$	—
Private student loans(4)	$	53	$	1	N/A
For the Six Months Ended June 30, 2017
Credit card loans(3)	$	1,122	$	50	$	42
Personal loans	$	87	$	5	$	2
Private student loans(4)	$	101	$	3	$	—
For the Six Months Ended June 30, 2016
Credit card loans(3)	$	1,019	$	42	$	39
Personal loans	$	70	$	4	$	1
Private student loans(4)	$	52	$	2	N/A

(1) The Company does not separately track interest income on loans in modification programs. Amounts shown are estimated by applying an average interest rate to the average loans in the various modification programs.

(2) The Company does not separately track the amount of additional gross interest income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. Amounts shown are estimated by applying the difference between the average interest rate earned on non-impaired loans and the average interest rate earned on loans in the modification programs to the average loans in the modification programs.

(3) Includes credit card loans that were modified in troubled debt restructurings, but are no longer enrolled in a troubled debt restructuring program due to noncompliance with the terms of the modification or successful completion of a program. The average balance of credit card loans that were no longer enrolled in a troubled debt restructuring program was $324 million and $274 million, respectively, for the three months ended June 30, 2017 and 2016, and $317 million and $274 million for the six months ended June 30, 2017 and 2016.

(4) As a result of the updates implemented in the third quarter of 2016, some student loans accounted for as troubled debt restructurings have additional gross income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. For the three and six months ended June 30, 2017, the gross income that would have been recorded with original terms for student loans in modification programs was not material.

In order to evaluate the primary financial effects that resulted from credit card loans entering into a loan modification program during the three and six months ended June 30, 2017 and 2016, the Company quantified the amount by which interest and fees were reduced during the periods. During the three months ended June 30, 2017 and 2016, the Company forgave approximately $10 million and $7 million, respectively, of interest and fees as a result of accounts entering into a credit card loan modification program. During the six months ended June 30, 2017 and 2016, the Company forgave approximately $21 million and $16 million, respectively, of interest and fees as a result of accounts entering into a credit card loan modification program.

The following table provides information on loans that entered a loan modification program during the period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	26,078	$	157	19,780	$	118
Personal loans	1,430	$	18	1,027	$	12
Private student loans	1,003	$	18	289	$	4
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	56,971	$	338	42,064	$	253
Personal loans	2,993	$	36	2,088	$	24
Private student loans	2,020	$	35	741	$	12

The following table presents the carrying value of loans that experienced a payment default during the period that had been modified in a troubled debt restructuring during the 15 months preceding the end of each period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	8,049	$	43	4,380	$	23
Personal loans(2)	341	$	4	276	$	3
Private student loans(3)	184	$	3	177	$	3
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	16,215	$	87	9,080	$	48
Personal loans(2)	648	$	8	434	$	5
Private student loans(3)	369	$	6	374	$	6

(1) Terms revert back to the pre-modification terms for customers who default from a temporary program and charging privileges remain revoked in most cases.

(2) For credit card loans and personal loans, a customer defaults from a modification program after two consecutive missed payments. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

(3) For student loans, defaults have been defined as loans that are 60 or more days delinquent. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

Of the account balances that defaulted as shown above for the three months ended June 30, 2017 and 2016, approximately 39% and 34%, respectively, of the total balances were charged off at the end of the month in which they defaulted. Of the account balances that defaulted as shown above for the six months ended June 30, 2017 and 2016, approximately 39% and 35%, respectively, of the total balances were charged off at the end of the month in which that defaulted. For accounts that have defaulted from a loan modification program and have not been subsequently charged off, the balances are included in the allowance for loan loss analysis discussed above under "— Allowance for Loan Losses."

Purchased Credit-Impaired Loans

Purchased loans with evidence of credit deterioration since origination for which it is probable that not all contractually required payments will be collected are considered impaired at acquisition and are reported as PCI loans. The private student loans acquired in the SLC transaction, as well as the additional acquired private student loan portfolio comprise the Company’s only PCI loans at June 30, 2017 and December 31, 2016. Total PCI student loans had an outstanding balance of $2.4 billion and $2.7 billion, including accrued interest, and a related carrying amount of $2.3 billion and $2.6 billion as of June 30, 2017 and December 31, 2016, respectively.

The following table provides changes in accretable yield for the acquired loans during each period (dollars in millions):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	755		$	916		$	796		$	965
Accretion into interest income	(40		)	(47		)	(81		)	(96		)
Other changes in expected cash flows	10			19			10			19
Balance at end of period	$	725		$	888		$	725		$	888

Periodically, the Company updates the estimate of cash flows expected to be collected based on management's latest expectations of future credit losses, borrower prepayments and certain other assumptions that affect cash flows. No provision expense was recorded during the three and six months ended June 30, 2017 and 2016. The allowance for PCI loan losses at June 30, 2017 and December 31, 2016 was $33 million and $35 million. For the three and six months ended June 30, 2017 and 2016, increase in accretable yield was primarily driven by the increases in the rates on variable loans during the first half of 2017 and 2016. Changes to accretable yield are recognized prospectively as an adjustment to yield over the remaining life of the pools.

At June 30, 2017, the 30 or more days delinquency and 90 or more days delinquency rates on PCI student loans (which include loans not yet in repayment) were 2.70% and 0.85%, respectively. At December 31, 2016, the 30 or more days delinquency and 90 or more days delinquency rates on PCI student loans (which include loans not yet in repayment) were 2.88% and 0.87%, respectively. These rates include private student loans that are greater than 120 days delinquent that are covered by an indemnification agreement or insurance arrangements through which the Company expects to recover a substantial portion of the loan. The net charge-off rate on PCI student loans was 0.64% and 0.48% for the three months ended June 30, 2017 and 2016, respectively, and 0.58% and 0.46% for the six months ended June 30, 2017 and 2016, respectively.

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Credit Card and Student Loan Securitization Activities

6 Months Ended

Jun. 30, 2017

Variable Interest Entities Disclosure [Abstract]

Credit Card and Student Loan Securitization Activities

Credit Card and Student Loan Securitization Activities

The Company’s securitizations are accounted for as secured borrowings and the trusts are treated as consolidated subsidiaries of the Company. For a description of the Company’s principles of consolidation with respect to VIEs, see Note 1: Background and Basis of Presentation of the Company’s annual report on Form 10-K for the year ended December 31, 2016.

Credit Card Securitization Activities

The Company accesses the term asset securitization market through the Discover Card Master Trust I (“DCMT”) and the Discover Card Execution Note Trust (“DCENT”). Credit card loan receivables are transferred into DCMT and beneficial interests in DCMT are transferred into DCENT. Interests in DCENT are issued to investors in the form of debt securities and are reported in long-term borrowings.

The DCENT debt structure consists of four classes of securities (DiscoverSeries Class A, B, C and D notes), with the most senior class generally receiving a triple-A rating. In order to issue senior, higher rated classes of notes, it is necessary to obtain the appropriate amount of credit enhancement, generally through the issuance of junior, lower rated or more highly subordinated classes of notes. The subordinated classes are held by wholly-owned subsidiaries of Discover Bank. The Company is exposed to credit-related risk of loss associated with trust assets as of the balance sheet date through the retention of these subordinated interests. The estimated probable incurred loss is included in the allowance for loan losses estimate.

The Company’s retained interests in the assets of the trusts, consisting of investments in DCENT notes held by subsidiaries of Discover Bank, constitute intercompany positions which are eliminated in the preparation of the Company’s condensed consolidated statements of financial condition.

Upon transfer of credit card loan receivables to the trust, the receivables and certain cash flows derived from them become restricted for use in meeting obligations to the trusts’ creditors. Further, the transferred credit card loan receivables are owned by the trust and are not available to third-party creditors of the Company. The trusts have ownership of cash balances, the amounts of which are reported in restricted cash. With the exception of the seller’s interest in trust receivables, the Company’s interests in trust assets are generally subordinate to the interests of third-party investors and, as such, may not be realized by the Company if needed to absorb deficiencies in cash flows that are allocated to the investors in the trusts’ debt. Apart from the restricted assets related to securitization activities, the investors and the securitization trusts have no recourse to the Company’s other assets or the Company's general credit for a shortage in cash flows.

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	26		$	23
Investors’ interests held by third-party investors	16,100			15,625
Investors’ interests held by wholly-owned subsidiaries of Discover Bank	5,113			5,189
Seller’s interest	8,894			10,812
Loan receivables(1)	30,107			31,626
Allowance for loan losses allocated to securitized loan receivables(1)	(970		)	(928		)
Net loan receivables	29,137			30,698
Other	5			4
Carrying value of assets of consolidated variable interest entities	$	29,168		$	30,725

(1) The Company maintains its allowance for loan losses at an amount sufficient to absorb probable losses inherent in all loan receivables, which includes all loan receivables in the trusts. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company’s balance sheet in accordance with GAAP.

The debt securities issued by the consolidated trusts are subject to credit, payment and interest rate risks on the transferred credit card loan receivables. To protect investors in the securities, there are certain features or triggering events that could cause an early amortization of the debt securities, including triggers related to the impact of the performance of the trust receivables on the availability and adequacy of cash flows to meet contractual requirements. As of June 30, 2017, no economic or other early amortization events have occurred.

The Company continues to own and service the accounts that generate the loan receivables held by the trusts. Discover Bank receives servicing fees from the trusts based on a percentage of the monthly investor principal balance outstanding. Although the fee income to Discover Bank offsets the fee expense to the trusts and thus is eliminated in consolidation, failure to service the transferred loan receivables in accordance with contractual requirements could lead to a termination of the servicing rights and the loss of future servicing income, net of related expenses.

Student Loan Securitization Activities

Student loan trust receivables underlying third-party investors’ interests are recorded in PCI loans and the related debt issued by the trusts is reported in long-term borrowings. The assets of the trusts are restricted from being sold or pledged as collateral for other borrowings and the cash flows from these restricted assets may be used only to pay obligations of the trusts. With the exception of the trusts’ restricted assets, the trusts and investors have no recourse to the Company’s other assets or the Company's general credit for a shortage in cash flows.

Currently there are three trusts from which securities were issued to investors. Principal payments on the long-term secured borrowings are made as cash is collected on the underlying loans that are used as collateral on the secured borrowings. The Company does not have access to cash collected by the securitization trusts until cash is released in accordance with the trust indenture agreements and, for certain securitizations, no cash will be released to the Company until all outstanding trust borrowings have been repaid. Similar to the credit card securitizations, the Company continues to own and service the accounts that generate the student loan receivables held by the trusts and receives servicing fees from the trusts based on either a percentage of the principal balance outstanding or a flat fee per borrower. Although the servicing fee income offsets the fee expense related to the trusts and thus is eliminated in consolidation, failure to service the transferred loan receivables in accordance with contractual requirements could lead to a termination of the servicing rights and the loss of future servicing income, net of related expenses.

Under terms of all the trust arrangements, the Company has the option, but not the obligation, to provide financial support to the trusts, but has never provided such support. A substantial portion of the credit risk associated with the securitized loans has been transferred to third parties under private credit insurance or indemnification arrangements.

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	67		$	72
Student loan receivables(1)	1,249			1,390
Allowance for loan losses allocated to securitized loan receivables(1)	(25		)	(27		)
Net student loan receivables	1,224			1,363
Carrying value of assets of consolidated variable interest entities	$	1,291		$	1,435

(1) The Company maintains its allowance for loan losses on PCI loans sufficient to absorb probable decreases in cash flows that were previously expected. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company's balance sheet in accordance with GAAP.

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Deposits

6 Months Ended

Jun. 30, 2017

Deposits [Abstract]

Deposits

Deposits

The Company offers its deposit products to customers through two channels: (i) through direct marketing, internet origination and affinity relationships (“direct-to-consumer deposits”); and (ii) indirectly through contractual arrangements with securities brokerage firms (“brokered deposits”). Direct-to-consumer deposits include certificates of deposit, money market accounts, online savings and checking accounts and IRA certificates of deposit, while brokered deposits include certificates of deposit and sweep accounts.

The following table provides a summary of interest-bearing deposit accounts (dollars in millions):
	June 30, 2017		December 31, 2016
Certificates of deposit in amounts less than $100,000	$	19,597	$	20,225
Certificates of deposit in amounts $100,000 or greater(1)	5,977		5,864
Savings deposits, including money market deposit accounts	26,785		25,372
Total interest-bearing deposits	$	52,359	$	51,461

(1) Includes $1.4 billion in certificates of deposit greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of June 30, 2017 and December 31, 2016.

The following table summarizes certificates of deposit in amounts of $100,000 or greater by contractual maturity (dollars in millions):
Maturity Period	June 30, 2017
Three months or less	$	899
Over three months through six months	811
Over six months through twelve months	1,574
Over twelve months	2,693
Total	$	5,977

The following table summarizes certificates of deposit maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	5,966
2018	8,193
2019	3,435
2020	2,671
2021	1,879
Thereafter	3,430
Total	$	25,574

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Long-Term Borrowings

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Long-Term Borrowings

Long-Term Borrowings

Long-term borrowings consist of borrowings having original maturities of one year or more. The following table provides a summary of the Company’s long-term borrowings and weighted-average interest rates on outstanding balances (dollars in millions):
	June 30, 2017					December 31, 2016
	Maturity	Interest Rate	Weighted-Average Interest Rate	Outstanding Amount		Outstanding Amount
Securitized Debt
Fixed-rate asset-backed securities(1)	2017-2024	1.39%-5.65%	2.17%	$	9,818	$	9,868
Floating-rate asset-backed securities(2)(3)	2018-2024	1.39%-1.83%	1.60%	6,212		5,694
Total Discover Card Master Trust I and Discover Card Execution Note Trust				16,030		15,562
Floating-rate asset-backed securities(4)(5)(6)(7)	2031-2042	1.33%-5.00%	2.81%	708		849
Total SLC Private Student Loan Trusts				708		849
Total long-term borrowings - owed to securitization investors				16,738		16,411
Discover Financial Services (Parent Company)
Fixed-rate senior notes(1)	2019-2027	3.75%-10.25%	4.25%	2,695		2,090
Fixed-rate retail notes	2017-2031	2.85%-4.40%	3.70%	227		169
Discover Bank
Fixed-rate senior bank notes(1)	2018-2026	2.00%-4.25%	3.21%	6,081		6,077
Fixed-rate subordinated bank notes	2019-2020	7.00%-8.70%	7.49%	697		696
Total long-term borrowings				$	26,438	$	25,443

(1) The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in London Interbank Offered Rate (“LIBOR”). Use of these interest rate swaps impacts carrying value of the debt.

(2) Discover Card Execution Note Trust floating-rate asset-backed securities include issuances with the following interest rate terms: 1-month LIBOR + 23 to 60 basis points as of June 30, 2017.

(3) The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on a portion of these long-term borrowings. There is no impact on debt carrying value from use of these interest rate swaps. See Note 14: Derivatives and Hedging Activities for additional information.

(4) SLC Private Student Loan Trusts floating-rate asset-backed securities include issuances with the following interest rate terms: 3-month LIBOR + 17 to 45 basis points, Prime rate + 75 to 100 basis points and 1-month LIBOR + 350 basis points as of June 30, 2017.

(5) The Company acquired an interest rate swap related to the securitized debt assumed in the SLC transaction which matured and is no longer outstanding as of June 30, 2017. The swap did not qualify for hedge accounting and had no impact on debt carrying value. See Note 14: Derivatives and Hedging Activities for additional information.

(6) Repayment of this debt is dependent upon the timing of principal and interest payments on the underlying student loans. The dates shown represent final maturity dates.

(7) Includes $255 million of senior notes maturing in 2031, $436 million of senior and subordinated notes maturing in 2036 and $17 million of senior notes maturing in 2042 as of June 30, 2017.

The following table summarizes long-term borrowings maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	2,201
2018	5,269
2019	5,991
2020	3,433
2021	1,040
Thereafter	8,504
Total	$	26,438

The Company has access to committed undrawn capacity through private securitizations to support the funding of its credit card loan receivables. As of June 30, 2017, the total commitment of secured credit facilities through private providers was $6.0 billion, none of which was drawn as of June 30, 2017. Access to the unused portions of the secured credit facilities is subject to the terms of the agreements with each of the providers which have various expirations in calendar years 2018 through 2020. Borrowings outstanding under each facility bear interest at a margin above LIBOR or the asset-backed commercial paper costs of each individual conduit provider. The terms of each agreement provide for a commitment fee to be paid on the unused capacity and include various affirmative and negative covenants, including performance metrics and legal requirements similar to those required to issue any term securitization transaction.

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Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income

Changes in each component of accumulated other comprehensive income (loss) ("AOCI") were as follows (dollars in millions):
	Unrealized (Loss) Gain on Available-for-Sale Investment Securities, Net of Tax			(Loss) Gain on Cash Flow Hedges, Net of Tax			Pension Plan Loss, Net of Tax			AOCI
For the Three Months Ended June 30, 2017
Balance at March 31, 2017	$	(2	)	$	(8	)	$	(145	)	$	(155	)
Net change	—			5			—			5
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Three Months Ended June 30, 2016
Balance at March 31, 2016	$	14		$	(46	)	$	(140	)	$	(172	)
Net change	4			(6		)	—			(2		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)
For the Six Months Ended June 30, 2017
Balance at December 31, 2016	$	(3	)	$	(13	)	$	(145	)	$	(161	)
Net change	1			10			—			11
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Six Months Ended June 30, 2016
Balance at December 31, 2015	$	—		$	(20	)	$	(140	)	$	(160	)
Net change	18			(32		)	—			(14		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)

The table below presents each component of other comprehensive income (loss) ("OCI") before reclassifications and amounts reclassified from AOCI for each component of OCI before- and after-tax (dollars in millions):
	Before Tax			Tax (Expense) Benefit			Net of Tax
For the Three Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain (loss) arising during the period	$	—		$	—		$	—
Net change	$	—		$	—		$	—
Cash Flow Hedges
Net unrealized gain arising during the period	$	3		$	(1	)	$	2
Amounts reclassified from AOCI	3			—			3
Net change	$	6		$	(1	)	$	5
For the Three Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	6		$	(2	)	$	4
Net change	$	6		$	(2	)	$	4
Cash Flow Hedges
Net unrealized loss arising during the period	$	(18	)	$	6		$	(12	)
Amounts reclassified from AOCI	9			(3		)	6
Net change	$	(9	)	$	3		$	(6	)
For the Six Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	2		$	(1	)	$	1
Net change	$	2		$	(1	)	$	1
Cash Flow Hedges
Net unrealized gain arising during the period	$	9		$	(4	)	$	5
Amounts reclassified from AOCI	8			(3		)	5
Net change	$	17		$	(7	)	$	10
For the Six Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	29		$	(11	)	$	18
Net change	$	29		$	(11	)	$	18
Cash Flow Hedges
Net unrealized loss arising during the period	$	(70	)	$	27		$	(43	)
Amounts reclassified from AOCI	18			(7		)	11
Net change	$	(52	)	$	20		$	(32	)

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Income Taxes

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The following table presents the calculation of the Company's effective income tax rate (dollars in millions, except effective income tax rate):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Income before income tax expense	$	867		$	898		$	1,735		$	1,812
Income tax expense	$	321		$	282		$	625		$	621
Effective income tax rate	37.1		%	31.4		%	36.0		%	34.3		%

Income tax expense increased $39 million and $4 million for the three and six months ended June 30, 2017, respectively, compared to the same periods in 2016. The effective tax rates for the three and six months ended June 30, 2017 of 37.1% and 36.0%, respectively, increased from 31.4% and 34.3% for the same periods in 2016. The increase in rates is primarily due to the settlement with the United States Congress Joint Committee on Taxation that occurred in the second quarter of 2016.

The Company is subject to examination by the Internal Revenue Service ("IRS") and tax authorities in various state, local and foreign tax jurisdictions. The Company regularly assesses the likelihood of additional assessments or settlements in each of the taxing jurisdictions resulting from these and subsequent years' examinations. The 2008-2010 federal audit is currently under Administrative Appeals and the IRS is currently examining the years 2011-2015. At this time, the potential change in unrecognized tax benefits is not expected to be significant over the next 12 months. The Company believes that its reserves are sufficient to cover any tax, penalties and interest that would result from such examinations.

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Earnings Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

The following table presents the calculation of basic and diluted earnings per share ("EPS") (in millions, except per share amounts):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Numerator
Net income	$	546		$	616		$	1,110		$	1,191
Preferred stock dividends	(10		)	(10		)	(19		)	(19		)
Net income available to common stockholders	536			606			1,091			1,172
Income allocated to participating securities	(4		)	(4		)	(8		)	(8		)
Net income allocated to common stockholders	$	532		$	602		$	1,083		$	1,164
Denominator
Weighted-average shares of common stock outstanding	379			410			382			414
Effect of dilutive common stock equivalents	—			1			—			—
Weighted-average shares of common stock outstanding and common stock equivalents	379			411			382			414
Basic earnings per common share	$	1.41		$	1.47		$	2.83		$	2.81
Diluted earnings per common share	$	1.40		$	1.47		$	2.83		$	2.81

Anti-dilutive securities were not material and had no impact on the computation of diluted EPS for the three and six months ended June 30, 2017 and 2016.

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Capital Adequacy

6 Months Ended

Jun. 30, 2017

Regulatory Capital Requirements [Abstract]

Capital Adequacy

Capital Adequacy

The Company is subject to the capital adequacy guidelines of the Federal Reserve, and Discover Bank, the Company’s main banking subsidiary, is subject to various regulatory capital requirements as administered by the FDIC. Failure to meet minimum capital requirements can result in the initiation of certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the financial position and results of the Company and Discover Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and Discover Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items, as calculated under regulatory guidelines. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

In 2013, the Federal Reserve, the Office of the Comptroller of the Currency, and the FDIC issued final capital rules under the Basel Committee’s December 2010 framework (referred to as “Basel III”) establishing a new comprehensive capital framework for U.S. banking organizations. The final capital rules ("Basel III rules") substantially revise Basel I rules regarding the risk-based capital requirements applicable to bank holding companies and depository institutions, including the Company. The Basel III rules became effective for the Company on January 1, 2015. This timing is based on the Company being classified as a "Standardized Approach" entity.

Among other things, the Basel III rules (i) introduced a new capital measure called Common Equity Tier 1 (“CET1”), (ii) specify that Tier 1 capital consists of CET1 and additional Tier 1 capital instruments meeting specified requirements, (iii) apply most deductions/adjustments to regulatory capital measures to CET1 and not to the other components of capital, thus potentially requiring higher levels of CET1 in order to meet minimum ratios and (iv) expand the scope of the deductions/adjustments from capital as compared to existing regulations.

The Basel III minimum capital ratios are as follows:

• 8.0% Total capital (i.e., Tier 1 plus Tier 2) to risk-weighted assets;

• 6.0% Tier 1 capital (i.e., CET1 plus Additional Tier 1) to risk-weighted assets;

• 4.0% Tier 1 capital to average consolidated assets as reported on consolidated financial statements (known as the “leverage ratio”); and

• 4.5% CET1 to risk-weighted assets.

As of June 30, 2017, the Company and Discover Bank met all Basel III minimum capital ratio requirements to which they were subject. The Company and Discover Bank also met the requirements to be considered "well-capitalized" under Regulation Y and prompt corrective action regulations, respectively, and there have been no conditions or events that management believes have changed the Company's or Discover Bank's category. To be categorized as “well-capitalized,” the Company and Discover Bank must maintain minimum capital ratios as set forth in the table below.

The following table shows the actual capital amounts and ratios of the Company and Discover Bank and comparisons of each to the regulatory minimum and “well-capitalized” requirements (dollars in millions):
	Actual				Minimum Capital Requirements			Capital Requirements To Be Classified as Well-Capitalized
	Amount		Ratio		Amount		Ratio	Amount(1)		Ratio(1)
June 30, 2017
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,263	15.2	%	$	6,436	≥8.0%	$	8,045	≥10.0%
Discover Bank	$	12,392	15.5	%	$	6,376	≥8.0%	$	7,970	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,052	13.7	%	$	4,827	≥6.0%	$	4,827	≥6.0%
Discover Bank	$	10,600	13.3	%	$	4,782	≥6.0%	$	6,376	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,052	11.8	%	$	3,742	≥4.0%	N/A		N/A
Discover Bank	$	10,600	11.4	%	$	3,710	≥4.0%	$	4,637	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,492	13.0	%	$	3,620	≥4.5%	N/A		N/A
Discover Bank	$	10,600	13.3	%	$	3,587	≥4.5%	$	5,181	≥6.5%
December 31, 2016
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,445	15.5	%	$	6,408	≥8.0%	$	8,010	≥10.0%
Discover Bank	$	12,334	15.5	%	$	6,346	≥8.0%	$	7,932	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,152	13.9	%	$	4,806	≥6.0%	$	4,806	≥6.0%
Discover Bank	$	10,450	13.2	%	$	4,759	≥6.0%	$	6,346	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,152	12.3	%	$	3,624	≥4.0%	N/A		N/A
Discover Bank	$	10,450	11.6	%	$	3,591	≥4.0%	$	4,488	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,592	13.2	%	$	3,604	≥4.5%	N/A		N/A
Discover Bank	$	10,450	13.2	%	$	3,570	≥4.5%	$	5,156	≥6.5%

(1) The Basel III rules do not establish well-capitalized thresholds for these measures for bank holding companies. Existing well-capitalized thresholds established in the Federal Reserve's Regulation Y have been included where available.

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Commitments, Contingencies and Guarantees

6 Months Ended

Jun. 30, 2017

Commitments Contingencies and Guarantees [Abstract]

Commitments, Contingencies and Guarantees

Commitments, Contingencies and Guarantees

In the normal course of business, the Company enters into a number of off-balance sheet commitments, transactions and obligations under guarantee arrangements that expose the Company to varying degrees of risk. The Company's commitments, contingencies and guarantee relationships are described below.

Commitments

Lease Commitments

The Company leases various office space and equipment under capital and non-cancelable operating leases, which expire at various dates through 2028. Future minimum payments on capital leases were not material at June 30, 2017. The following table shows future minimum payments on non-cancelable operating leases with original terms in excess of one year (dollars in millions):
	June 30, 2017
2017	$	6
2018	12
2019	11
2020	10
2021	9
Thereafter	41
Total minimum lease payments	$	89

Unused Commitments to Extend Credit

At June 30, 2017, the Company had unused commitments to extend credit for loans of approximately $184.3 billion. Such commitments arise primarily from agreements with customers for unused lines of credit on certain credit cards and certain other loan products, provided there is no violation of conditions in the related agreements. These commitments, substantially all of which the Company can terminate at any time and which do not necessarily represent future cash requirements, are periodically reviewed based on account usage, customer creditworthiness and loan qualification.

Contingencies

See Note 12: Litigation and Regulatory Matters for a description of potential liability arising from pending litigation or regulatory proceedings involving the Company.

Guarantees

The Company has obligations under certain guarantee arrangements, including contracts, indemnification agreements, and representations and warranties, which contingently require the Company to make payments to the guaranteed party based on changes in an underlying asset, liability or equity security of a guaranteed party, rate or index. Also included as guarantees are contracts that contingently require the Company to make payments to a guaranteed party based on another entity's failure to perform under an agreement. The Company's use of guarantees is disclosed below by type of guarantee.

Securitizations Representations and Warranties

As part of the Company’s financing activities, the Company provides representations and warranties that certain assets pledged as collateral in secured borrowing arrangements conform to specified guidelines. Due diligence is performed by the Company which is intended to ensure that asset guideline qualifications are met. If the assets pledged as collateral do not meet certain conforming guidelines, the Company may be required to replace, repurchase or sell such assets. In its credit card securitization activities, the Company would replace nonconforming receivables through the allocation of excess seller’s interest or from additional transfers from the unrestricted pool of receivables. If the Company could not add enough receivables to satisfy the requirement, an early amortization (or repayment) of investors’ interests would be triggered. In its student loan securitizations, the Company would generally repurchase the loans from the trust at the outstanding principal amount plus interest.

The maximum potential amount of future payments the Company could be required to make would be equal to the current outstanding balances of third-party investor interests in credit card asset-backed securities, and the principal amount of any student loan secured borrowings, plus any unpaid interest for the corresponding secured borrowings. The Company has recorded substantially all of the maximum potential amount of future payments in long-term borrowings on the Company’s condensed consolidated statements of financial condition. The Company has not recorded any incremental contingent liability associated with its secured borrowing representations and warranties. Management believes that the probability of having to replace, repurchase or sell assets pledged as collateral under secured borrowing arrangements, including an early amortization event, is low.

Mortgage Loans Representations and Warranties

The Company sold loans it originated to investors on a servicing-released basis and the risk of loss or default by the borrower is generally transferred to the investor. However, the Company was required by these investors to make certain representations and warranties relating to credit information, loan documentation and collateral. These representations and warranties may extend through the contractual life of the mortgage loan, even though the Company closed the mortgage origination business. Subsequent to the sale, if underwriting deficiencies, borrower fraud or documentation defects are discovered in individual mortgage loans, the Company may be obligated to repurchase the respective mortgage loan or indemnify the investors for any losses from borrower defaults if such deficiency or defect cannot be cured within the specified period following discovery. The Company has established a repurchase reserve based on expected losses. At June 30, 2017, this amount was not material and was included in accrued expenses and other liabilities on the condensed consolidated statements of financial condition.

Counterparty Settlement Guarantees

Diners Club and DFS Services LLC (on behalf of PULSE) have various counterparty exposures, which are listed below.

• Merchant Guarantee. Diners Club has entered into contractual relationships with certain international merchants, which generally include travel-related businesses, for the benefit of all Diners Club licensees. The licensees hold the primary liability to settle the transactions of their customers with these merchants. However, Diners Club retains a counterparty exposure if a licensee fails to meet its financial payment obligation to one of these merchants.

• ATM Guarantee. PULSE entered into contractual relationships with certain international ATM acquirers in which DFS Services LLC retains counterparty exposure if an issuer fails to fulfill its settlement obligation.

• Network Alliance Guarantee. Discover Network, Diners Club and PULSE have entered into contractual relationships with certain international payment networks in which DFS Services LLC retains the counterparty exposure if a network fails to fulfill its settlement obligation.

The maximum potential amount of future payments related to such contingent obligations is dependent upon the transaction volume processed between the time a potential counterparty defaults on its settlement and the time at which the Company disables the settlement of any further transactions for the defaulting party. However, there is no limitation on the maximum amount the Company may be liable to pay. The actual amount of the potential exposure cannot be quantified as the Company cannot determine whether particular counterparties will fail to meet their settlement obligations.

While the Company has some contractual remedies to offset these counterparty settlement exposures (such as letters of credit or pledged deposits), in the event that all licensees and/or issuers were to become unable to settle their transactions, the Company estimates its maximum potential counterparty exposures to these settlement guarantees, based on historical transaction volume, would be $152 million for merchant guarantees as of June 30, 2017. The maximum potential counterparty exposures to these settlement guarantees for ATM guarantees would be immaterial as of June 30, 2017. The maximum potential counterparty exposures for network alliance guarantees would be $31 million as of June 30, 2017.

The Company believes that the estimated amounts of maximum potential future payments are not representative of the Company's actual potential loss exposure given Diners Club's and PULSE's insignificant historical losses from these counterparty exposures. As of June 30, 2017, the Company had not recorded any contingent liability in the consolidated financial statements for these counterparty exposures, and management believes that the probability of any payments under these arrangements is low.

Discover Network Merchant Chargeback Guarantees

The Company operates the Discover Network, issues payment cards and permits third parties to issue payment cards. The Company is contingently liable for certain transactions processed on the Discover Network in the event of a dispute between the payment card customer and a merchant. The contingent liability arises if the disputed transaction involves a merchant or merchant acquirer with whom the Discover Network has a direct relationship. If a dispute is resolved in the customer’s favor, the Discover Network will credit or refund the disputed amount to the Discover Network card issuer, who in turn credits its customer’s account. The Discover Network will then charge back the disputed amount of the payment card transaction to the merchant or merchant acquirer, where permitted by the applicable agreement, to seek recovery of amounts already paid to the merchant for payment card transactions. If the Discover Network is unable to collect the amount subject to dispute from the merchant or merchant acquirer (e.g., in the event of merchant default or dissolution or after expiration of the time period for chargebacks in the applicable agreement), the Discover Network will bear the loss for the amount credited or refunded to the customer. In most instances, a loss by the Discover Network is unlikely to arise in connection with payments on card transactions because most products or services are delivered when purchased and credits are issued by merchants on returned items in a timely fashion, thus minimizing the likelihood of cardholder disputes with respect to amounts paid by the Discover Network. However, where the product or service is not scheduled to be provided to the customer until a later date following the purchase, the likelihood of a contingent payment obligation by the Discover Network increases. Losses related to merchant chargebacks were not material for the three and six months ended June 30, 2017 and 2016.

The maximum potential amount of obligations of the Discover Network arising as a result of such contingent obligations is estimated to be the portion of the total Discover Network transaction volume processed to date for which timely and valid disputes may be raised under applicable law and relevant issuer and customer agreements. There is no limitation on the maximum amount the Company may be liable to pay to issuers. However, the Company believes that such amount is not representative of the Company’s actual potential loss exposure based on the Company’s historical experience. The actual amount of the potential exposure cannot be quantified as the Company cannot determine whether the current or cumulative transaction volumes may include or result in disputed transactions.

The table below summarizes certain information regarding merchant chargeback guarantees (in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Aggregate sales transaction volume(1)	$	35,885	$	34,634	$	68,539	$	65,915

(1) Represents period transactions processed on the Discover Network for which a potential liability exists that, in aggregate, can differ from credit card sales volume.

The Company did not record any contingent liability in the condensed consolidated financial statements for merchant chargeback guarantees as of June 30, 2017 or December 31, 2016. The Company mitigates the risk of potential loss exposure by withholding settlement from merchants, obtaining third-party guarantees, or obtaining escrow deposits or letters of credit from certain merchant acquirers or merchants that are considered higher risk due to various factors such as time delays in the delivery of products or services. As of June 30, 2017 and December 31, 2016, the Company had escrow deposits and settlement withholdings of $7 million and $9 million, respectively, which are recorded in interest-bearing deposit accounts and accrued expenses and other liabilities on the Company's condenses consolidated statements of financial condition.

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Litigation and Regulatory Matters

6 Months Ended

Jun. 30, 2017

Loss Contingency [Abstract]

Litigation and Regulatory Matters

Litigation and Regulatory Matters

In the normal course of business, from time to time, the Company has been named as a defendant in various legal actions, including arbitrations, class actions and other litigation, arising in connection with its activities. Certain of the actual or threatened legal actions include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. The litigation process is not predictable and can lead to unexpected results. The Company contests liability and/or the amount of damages as appropriate in each pending matter.

The Company has historically relied on the arbitration clause in its customer agreements, which has in some instances limited the costs of, and the Company’s exposure to, litigation, but there can be no assurance that the Company will continue to be successful in enforcing its arbitration clause in the future. Legal and regulatory challenges and prohibitions may also cause the Company to discontinue use of such clauses. From time to time, the Company is involved in legal actions challenging its arbitration clause. Bills are periodically introduced in Congress to directly or indirectly prohibit the use of pre-dispute arbitration clauses. The Dodd-Frank Wall Street Reform and Consumer Protection Act authorized the Consumer Financial Protection Bureau (the "CFPB") to conduct a study on pre-dispute arbitration clauses and, based on the study, potentially limit or ban arbitration clauses. On July 10, 2017, the CFPB issued a final arbitration rule that would (i) effectively ban consumer financial companies from including class action waivers in arbitration clauses, and (ii) require records of arbitrations to be provided to the CFPB for publication on its website. The final rule will become effective 60 days after its publication in the Federal Register, and applies to customer agreements entered into 180 days after its effective date. The Company is currently assessing the impact of the final rule, but believes that, subject to certain exceptions, it will generally not apply to arbitration clauses the Company already has in place with its existing customer base. The final rule may be subject to a variety of legal and other challenges including by Congress, through private litigation and other means, which may limit or even eliminate the rule.

The Company is also involved, from time to time, in other reviews, investigations and proceedings (both formal and informal) by governmental agencies regarding the Company’s business including, among other matters, consumer regulatory, accounting, tax and other operational matters, some of which may result in significant adverse judgments, settlements, fines, penalties, injunctions, decreases in regulatory ratings, customer restitution or other relief, which could materially impact the Company's condensed consolidated financial statements, increase its cost of operations, or limit its ability to execute its business strategies and engage in certain business activities. For example, Discover Bank and Discover Financial Services have been the subject of actions by the FDIC and the Federal Reserve, respectively, with respect to anti-money laundering and related compliance programs as described more fully below. In addition, certain subsidiaries of the Company are subject to a consent order with the CFPB regarding certain student loan servicing practices, as described below. Regulatory actions generally can include demands for civil money penalties, changes to certain business practices and customer restitution. Supervisory actions related to anti-money laundering and related laws and regulations will limit for a period of time the Company's ability to enter into certain types of acquisitions and make certain types of investments.

In accordance with applicable accounting guidance, the Company establishes an accrued liability for legal and regulatory matters when those matters present loss contingencies which are both probable and estimable. Litigation and regulatory settlement related expense was not material for the three and six months ended June 30, 2017 and 2016.

There may be an exposure to loss in excess of any amounts accrued. The Company believes the estimate of the aggregate range of reasonably possible losses (meaning those losses the likelihood of which is more than remote but less than likely) in excess of the amounts that the Company has accrued for legal and regulatory proceedings is up to $150 million. This estimated range of reasonably possible losses is based upon currently available information for those proceedings in which the Company is involved, takes into account the Company’s best estimate of such losses for those matters for which an estimate can be made, and does not represent the Company’s maximum potential loss exposure. Various aspects of the legal proceedings underlying the estimated range will change from time to time and actual results may vary significantly from the estimate.

The Company’s estimated range above involves significant judgment, given the varying stages of the proceedings, the existence of numerous yet to be resolved issues, the breadth of the claims (often spanning multiple years and, in some cases, a wide range of business activities), unspecified damages and/or the novelty of the legal issues presented. The outcome of pending matters could be material to the Company’s condensed consolidated financial condition, operating results and cash flows for a particular future period, depending on, among other things, the level of the Company’s income for such period, and could adversely affect the Company’s reputation.

On July 5, 2012, the Antitrust Division of the United States Department of Justice (the “Division”) issued a Civil Investigative Demand ("CID") to the Company seeking information regarding an investigation related to potential violations of Sections 1 and 2 of the Sherman Act, 15 U.S.C. §§1-2, by an unidentified party other than Discover. The CID seeks documents, data and narrative responses to several interrogatories and document requests, related to the debit card market. A CID is a request for information in the course of a civil investigation and does not constitute the commencement of legal proceedings. The Division is permitted by statute to issue a CID to anyone whom it believes may have information relevant to an investigation. The receipt of a CID does not presuppose that there is probable cause to believe that a violation of the antitrust laws has occurred or that a formal complaint ultimately will be filed. The Company is cooperating with the Division in connection with the CID.

On May 26, 2015, the Company entered into a written agreement with the Federal Reserve Bank of Chicago where the Company agreed to enhance the Company’s enterprise-wide anti-money laundering and related compliance programs. The agreement does not include civil money penalties. This agreement follows the consent order that Discover Bank entered into with the FDIC on June 13, 2014 related to Discover Bank’s anti-money laundering and related compliance programs. In the consent order, Discover Bank agreed to, among other things, enhance its anti-money laundering and related compliance programs.

On July 9, 2015, a class action lawsuit was filed against the Company in the U.S. District Court for the Northern District of Illinois (Polly Hansen v. Discover Financial Services and Discover Home Loans, Inc.). The plaintiff alleges that the Company contacted her, and members of the class she seeks to represent, on their cellular and residential telephones without their express consent or after consent was revoked in violation of the Telephone Consumer Protection Act ("TCPA"). Plaintiff seeks statutory damages for alleged negligent and willful violations of the TCPA, attorneys' fees, costs and injunctive relief. The TCPA provides for statutory damages of $500 for each violation ($1,500 for willful violations). On March 9, 2016, Sumner Davenport was substituted as lead plaintiff for Polly Hansen. On January 13, 2017, plaintiff filed an unopposed motion for preliminary approval of a class action settlement to resolve the case. On January 20, 2017, the Court granted preliminary approval of the settlement. The final approval hearing is scheduled for September 14, 2017. If approved, the case will be dismissed with prejudice as to all certified class members who do not opt out of the settlement.

On July 22, 2015, the Company announced that its subsidiaries, Discover Bank, The Student Loan Corporation and Discover Products Inc. (the “Discover Subsidiaries”), agreed to a consent order with the CFPB resolving the agency’s investigation with respect to certain student loan servicing practices. The CFPB’s investigation into these practices has been previously disclosed by the Company, initially in February 2014. The order required the Discover Subsidiaries to provide redress of approximately $16 million to consumers who may have been affected by the activities described in the order related to certain collection calls, overstatements of minimum payment due amounts in billing statements, and provision of interest paid information to consumers, and provide regulatory disclosures with respect to loans acquired in default. In addition, the Discover Subsidiaries were required to pay a $2.5 million civil money penalty to the CFPB. As required by the consent order, on October 19, 2015, the Discover Subsidiaries submitted to the CFPB a redress plan and a compliance plan designed to ensure that the Discover Subsidiaries provide redress and otherwise comply with the terms of the order.

On September 4, 2015, the District Attorney of Trinity County, California filed a protection products lawsuit against the Company in California state court (The People of the State of California Ex Rel, Eric L. Heryford, District Attorney, Trinity County v. Discover Financial Services, et al.). The District Attorney subsequently dismissed this lawsuit on February 19, 2016 and filed a new complaint in federal court in the Eastern District of California on March 4, 2016 alleging the same cause of action. An amended complaint was filed on March 25, 2016. The lawsuit asserts various claims under California's Unfair Competition Law with respect to the Company's marketing and administration of various protection products. Plaintiff seeks declaratory relief, statutory civil penalties, and attorneys’ fees. The Company filed a motion to dismiss the first amended complaint on April 26, 2016. The Company is not in a position at this time to assess the likely outcome or its exposure, if any, with respect to this matter, but will seek to vigorously defend against all claims asserted by the plaintiff.

On March 8, 2016, a class action lawsuit was filed against the Company, other credit card networks, other issuing banks, and EMVCo in the U.S. District Court for the Northern District of California (B&R Supermarket, Inc., d/b/a Milam’s Market, et al. v. Visa, Inc. et al.) alleging violations of the Sherman Antitrust Act, California's Cartwright Act, and unjust enrichment. Plaintiffs allege a conspiracy by defendants to shift fraud liability to merchants with the migration to the EMV security standard and chip technology. Plaintiffs assert joint and several liability among the defendants and seek unspecified damages, including treble damages, attorneys' fees, costs and injunctive relief. On July 15, 2016, plaintiffs filed an amended complaint that includes additional named plaintiffs, reasserts the original claims, and includes additional state law causes of action. The defendants filed motions to dismiss on August 5, 2016. On September 30, 2016, the court granted the motions to dismiss for certain issuing banks and EMVCo but denied the motions to dismiss filed by the networks, including the Company. Discovery is proceeding and class certification is fully briefed but the court did not rule on certification before it entered an order in May 2017 transferring the entire action to a federal court in New York that is presiding over certain related claims that are pending in the actions consolidated as MDL 1720. In June 2017, the federal court in New York declined to consolidate the B&R case with MDL 1720, but ordered the parties to coordinate discovery across the actions to the extent they involved related issues. On July 6, 2017, the Company requested permission to file a motion to dismiss the claims against it in the federal court in New York. A ruling on that request is expected on or before the August 24, 2017 status conference in which the Court is expected to set a schedule for remaining discovery and further proceedings on class certification. The Company is not in a position at this time to assess the likely outcome or its exposure, if any, with respect to this matter, but will seek to vigorously defend against all claims asserted by the plaintiffs.

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Fair Value Measurements and Disclosures

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements and Disclosures

Fair Value Measurements and Disclosures

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820, Fair Value Measurement, provides a three-level hierarchy for classifying financial instruments, which is based on whether the inputs to the valuation techniques used to measure the fair value of each financial instrument are observable or unobservable. It also requires certain disclosures about those measurements. The three-level valuation hierarchy is as follows:

• Level 1: Fair values determined by Level 1 inputs are defined as those that utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access.

• Level 2: Fair values determined by Level 2 inputs are those that utilize inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar assets and liabilities in active or inactive markets, quoted prices for the identical assets in an inactive market, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals. The Company evaluates factors such as the frequency of transactions, the size of the bid-ask spread and the significance of adjustments made when considering transactions involving similar assets or liabilities to assess the relevance of those observed prices. If relevant and observable prices are available, the fair values of the related assets or liabilities would be classified as Level 2.

• Level 3: Fair values determined by Level 3 inputs are those based on unobservable inputs and include situations where there is little, if any, market activity for the asset or liability being valued. In instances in which the inputs used to measure fair value may fall into different levels of the fair value hierarchy, the level in the fair value hierarchy within which the fair value measurement in its entirety is classified is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company may utilize both observable and unobservable inputs in determining the fair values of financial instruments classified within the Level 3 category.

The determination of classification of its financial instruments within the fair value hierarchy is performed at least quarterly by the Company. For transfers in and out of the levels of the fair value hierarchy, the Company discloses the fair value measurement based on the value immediately preceding the transfer.

The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and involves consideration of factors specific to the asset or liability. Furthermore, certain techniques used to measure fair value involve some degree of judgment and, as a result, are not necessarily indicative of the amounts the Company would realize in a current market exchange.

During the six months ended June 30, 2017, there were no changes to the Company's valuation techniques that had, or are expected to have, a material impact on the Company's condensed consolidated financial position or results of operations.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are as follows (dollars in millions):
	Quoted Price in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs  (Level 2)		Significant Unobservable Inputs  (Level 3)		Total
Balance at June 30, 2017
Assets
U.S. Treasury securities	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		827		—		827
Available-for-sale investment securities	$	672	$	827	$	—	$	1,499
Derivative financial instruments(1)	$	—	$	5	$	—	$	5
Liabilities
Derivative financial instruments(1)	$	—	$	13	$	—	$	13
Balance at December 31, 2016
Assets
U.S. Treasury securities	$	674	$	—	$	—	$	674
Residential mortgage-backed securities - Agency	—		931		—		931
Available-for-sale investment securities	$	674	$	931	$	—	$	1,605
Derivative financial instruments	$	—	$	7	$	—	$	7
Liabilities
Derivative financial instruments	$	—	$	94	$	—	$	94

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. See Note 14: Derivatives and Hedging Activities for additional information.

There were no transfers between Levels 1 and 2 within the fair value hierarchy for the three or six months ended June 30, 2017 and 2016.

Available-for-Sale Investment Securities

Investment securities classified as available-for-sale consist of U.S. Treasury securities and residential mortgage-backed securities. The fair value estimates of investment securities classified as Level 1, consisting of U.S. Treasury securities, are determined based on quoted market prices for the same securities. The Company classifies residential mortgage-backed securities as Level 2, the fair value estimates of which are based on the best information available. This data may consist of observed market prices, broker quotes or discounted cash flow models that incorporate assumptions such as benchmark yields, issuer spreads, prepayment speeds, credit ratings and losses, the priority of which may vary based on availability of information.

The Company validates the fair value estimates provided by the pricing services primarily by comparison to valuations obtained through other pricing sources. The Company evaluates pricing variances amongst different pricing sources to ensure that the valuations utilized are reasonable. The Company also corroborates the reasonableness of the fair value estimates with analysis of trends of significant inputs, such as market interest rate curves. The Company further performs due diligence in understanding the procedures and techniques performed by the pricing services to derive fair value estimates.

At June 30, 2017, amounts reported in residential mortgage-backed securities reflect government-rated obligations issued by Fannie Mae, Freddie Mac and Ginnie Mae with a par value of $808 million, a weighted-average coupon of 2.81% and a weighted-average remaining maturity of three years.

Derivative Financial Instruments

The Company's derivative financial instruments consist of interest rate swaps and foreign exchange forward contracts. These instruments are classified as Level 2 as their fair values are estimated using proprietary pricing models, containing certain assumptions based on readily observable market-based inputs, including interest rate curves, option volatility and foreign currency forward and spot rates. In determining fair values, the pricing models use widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity and the observable market-based inputs. The fair values of the interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments are based on an expectation of future interest rates derived from the observable market interest rate curves. The Company considers collateral and master netting agreements that mitigate credit exposure to counterparties in determining the counterparty credit risk valuation adjustment. The fair values of the currency instruments are valued comparing the contracted forward exchange rate pertaining to the specific contract maturities to the current market exchange rate.

The Company validates the fair value estimates of interest rate swaps primarily through comparison to the fair value estimates computed by the counterparties to each of the derivative transactions. The Company evaluates pricing variances amongst different pricing sources to ensure that the valuations utilized are reasonable. The Company also corroborates the reasonableness of the fair value estimates with analysis of trends of significant inputs, such as market interest rate curves. The Company performs due diligence in understanding the impact to any changes to the valuation techniques performed by proprietary pricing models prior to implementation, working closely with the third-party valuation service, and reviews the control objectives of the service at least annually. The Company corroborates the fair value of foreign exchange forward contracts through independent calculation of the fair value estimates.

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The Company also has assets that under certain conditions are subject to measurement at fair value on a non-recurring basis. These assets include those associated with acquired businesses, including goodwill and other intangible assets. For these assets, measurement at fair value in periods subsequent to the initial recognition of the assets is applicable if one or more of the assets is determined to be impaired. During the three and six months ended June 30, 2017 and 2016, the Company had no material impairments related to these assets.

Financial Instruments Measured at Other Than Fair Value

The following tables disclose the estimated fair value of the Company's financial assets and financial liabilities that are not required to be carried at fair value (dollars in millions):
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Carrying Value
Balance at June 30, 2017
Assets
States and political subdivisions of states	$	—	$	1	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		179		—		179		179
Held-to-maturity investment securities	$	—	$	180	$	—	$	180	$	180
Cash and cash equivalents	$	12,950	$	—	$	—	$	12,950	$	12,950
Restricted cash	$	93	$	—	$	—	$	93	$	93
Net loan receivables	$	—	$	—	$	78,819	$	78,819	$	75,613
Accrued interest receivables	$	—	$	746	$	—	$	746	$	746
Liabilities
Deposits	$	—	$	53,024	$	—	$	53,024	$	52,864
Long-term borrowings - owed to securitization investors	$	—	$	16,127	$	743	$	16,870	$	16,738
Other long-term borrowings	$	—	$	10,222	$	—	$	10,222	$	9,700
Accrued interest payables	$	—	$	191	$	—	$	191	$	191
Balance at December 31, 2016
Assets
States and political subdivisions of states	$	—	$	2	$	—	$	2	$	2
Residential mortgage-backed securities - Agency	—		150		—		150		150
Held-to-maturity investment securities	$	—	$	152	$	—	$	152	$	152
Cash and cash equivalents	$	11,914	$	—	$	—	$	11,914	$	11,914
Restricted cash	$	95	$	—	$	—	$	95	$	95
Net loan receivables	$	—	$	—	$	78,252	$	78,252	$	75,087
Accrued interest receivables	$	—	$	724	$	—	$	724	$	724
Liabilities
Deposits	$	—	$	52,183	$	—	$	52,183	$	51,992
Long-term borrowings - owed to securitization investors	$	—	$	15,617	$	900	$	16,517	$	16,411
Other long-term borrowings	$	—	$	9,470	$	—	$	9,470	$	9,032
Accrued interest payables	$	—	$	168	$	—	$	168	$	168

The fair values of these financial assets and liabilities, which are not carried at fair value on the condensed consolidated statements of financial condition, were determined by applying the fair value provisions discussed herein. The use of different assumptions or estimation techniques may have a material effect on these estimated fair value amounts. The following describes the valuation techniques of these financial instruments measured at other than fair value.

Cash and Cash Equivalents

The carrying value of cash and cash equivalents approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

Restricted Cash

The carrying value of restricted cash approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

Held-to-Maturity Investment Securities

Held-to-maturity investment securities consist of residential mortgage-backed securities issued by agencies and municipal bonds. The fair value of residential mortgage-backed securities included in the held-to-maturity portfolio is estimated similarly to residential mortgage-backed securities carried at fair value on a recurring basis discussed herein. Municipal bonds are valued based on quoted market prices for the same or similar securities.

Net Loan Receivables

The Company's loan receivables are comprised of credit card and installment loans, including the PCI student loans. Fair value estimates are derived utilizing discounted cash flow analyses, the calculations of which are performed on groupings of loan receivables that are similar in terms of loan type and characteristics. Inputs to the cash flow analysis of each grouping consider recent prepayment trends and seasonality factors, if appropriate, as well as interest accrual estimates based on recent yields. The expected future cash flows, derived through the cash flow analysis, of each grouping are discounted at rates at which similar loans within each grouping could be originated under current market conditions. Significant inputs to the fair value measurement of the loan portfolio are unobservable and, as such, are classified as Level 3.

Accrued Interest Receivables

The carrying value of accrued interest receivables, which is included in other assets on the condensed consolidated statements of financial condition, approximates fair value as it is due in less than one year.

Deposits

The carrying values of money market deposits, savings deposits and demand deposits approximate fair value due to the potentially liquid nature of these deposits. For time deposits for which readily available market rates do not exist, fair values are estimated by discounting expected future cash flows using market rates currently offered for deposits with similar remaining maturities.

Long-Term Borrowings - Owed to Securitization Investors

Fair values of long-term borrowings owed to credit card securitization investors are determined utilizing quoted market prices of the same transactions and, as such, are classified as Level 2. Fair values of long-term borrowings owed to student loan securitization investors are calculated by discounting cash flows using estimated assumptions including, among other things, maturity and market discount rates. A portion of the difference between the carrying value and the fair value of the long-term borrowings owed to student loan securitization investors relates to purchase accounting adjustments recorded in connection with the December 2010 purchase of SLC. Significant inputs to these fair value measurements are unobservable and, as such, are classified as Level 3.

Other Long-Term Borrowings

Fair values of other long-term borrowings, consisting of subordinated and senior debt, are determined utilizing current observable market prices for those transactions and, as such, are classified as Level 2. A portion of the difference between the carrying value and the fair value of other long-term borrowings relates to the cash premiums paid in connection with the 2012 fiscal year debt exchanges.

Accrued Interest Payables

The carrying value of accrued interest payables, which is included in accrued expenses and other liabilities on the condensed consolidated statements of financial condition, approximates fair value as it is payable in less than one year.

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Derivatives and Hedging Activities

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

Derivatives and Hedging Activities

The Company uses derivatives to manage its exposure to various financial risks. The Company does not enter into derivatives for trading or speculative purposes. Certain derivatives used to manage the Company’s exposure to interest rate movements and other identified risks are not designated as hedges and do not qualify for hedge accounting.

Derivatives may give rise to counterparty credit risk, which generally is addressed through collateral arrangements as described under the sub-heading "— Collateral Requirements and Credit-Risk Related Contingency Features." The Company enters into derivative transactions with established dealers that meet minimum credit criteria established by the Company. All counterparties must be pre-approved prior to engaging in any transaction with the Company. Counterparties are monitored on a regular basis by the Company to ensure compliance with the Company’s risk policies and limits. In determining the counterparty credit risk valuation adjustment for the fair values of derivatives, the Company considers collateral and legally enforceable master netting agreements that mitigate credit exposure to related counterparties.

All derivatives are recorded in other assets at their gross positive fair values and in accrued expenses and other liabilities at their gross negative fair values. See Note 13: Fair Value Measurements and Disclosures for a description of the valuation methodologies of derivatives. Cash collateral posted and held balances are recorded in other assets and deposits, respectively, in the condensed consolidated statements of financial condition. Collateral amounts recorded in the condensed consolidated statements of financial condition are based on the net collateral posted or held position for each applicable legal entity's master netting arrangement with each counterparty. Effective in the first quarter of 2017, certain cash collateral amounts associated with derivative positions that are cleared through an exchange are now legally characterized as settlement of the derivative positions. This change results in such collateral amounts being reflected as offsets to the associated derivatives balances recorded in other assets or in accrued expenses and other liabilities, instead of as collateral in other assets or deposits. There is no change to the presentation in the condensed consolidated statements of financial condition of collateral related to positions that are not cleared through an exchange.

Derivatives Designated as Hedges

Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows arising from changes in interest rates, or other types of forecasted transactions, are considered cash flow hedges. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges.

Cash Flow Hedges

The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on credit card securitized debt and deposits. The Company's outstanding cash flow hedges are for an initial maximum period of seven years for securitized debt and deposits. The derivatives are designated as hedges of the risk of changes in cash flows on the Company's LIBOR or Federal Funds rate-based interest payments, and qualify for hedge accounting in accordance with ASC Topic 815, Derivatives and Hedging (“ASC 815”).

The effective portion of the change in the fair value of derivatives designated as cash flow hedges is recorded in OCI and is subsequently reclassified into earnings in the period that the hedged forecasted cash flows affect earnings. The ineffective portion of the change in fair value of the derivative, if any, is recognized directly in earnings. Amounts reported in AOCI related to derivatives at June 30, 2017 will be reclassified to interest expense as interest payments are made on certain of the Company's floating-rate securitized debt or deposits. During the next 12 months, the Company estimates it will reclassify $9 million of pretax losses to interest expense related to its derivatives designated as cash flow hedges.

Fair Value Hedges

The Company is exposed to changes in fair value of certain of its fixed-rate debt obligations due to changes in interest rates. The Company uses interest rate swaps to manage its exposure to changes in fair value of certain fixed-rate senior notes, securitized debt, bank notes and interest-bearing brokered deposits attributable to changes in LIBOR, a benchmark interest rate as defined by ASC 815. These interest rate swaps qualify as fair value hedges in accordance with ASC 815. Changes in both (i) the fair values of the derivatives and (ii) the hedged fixed-rate senior notes, securitized debt, bank notes and interest-bearing brokered deposits relating to the risk being hedged are recorded in interest expense. The changes generally provide substantial offset to one another, with any difference, or ineffectiveness recorded in interest expense. Any basis differences between the fair value and the carrying amount of the hedged item at the inception of the hedging relationship are amortized to interest expense.

Derivatives Not Designated as Hedges

Foreign Exchange Forward Contracts

The Company has foreign exchange forward contracts that are economic hedges and are not designated as accounting hedges. The Company enters into foreign exchange forward contracts to manage foreign currency risk. Changes in the fair value of these contracts are recorded in other income.

Derivatives Cleared Through an Exchange

Effective January 3, 2017, the Chicago Mercantile Exchange ("CME") changed the legal characterization of cash variation margin payments on derivatives cleared through its exchange as "settlements" rather than as "collateral". The Company currently utilizes only CME for all cleared transactions. The International Swaps and Derivatives Association ("ISDA") outlined their conclusions regarding the impact of the change, stating that variation margin payments that are legally considered settlement payments should be accounted for with corresponding derivative positions as one unit of account and should no longer be accounted for separately as collateral. The Securities and Exchange Commission staff did not object to the ISDA’s conclusions. The results of the change are reflected in the table below for the current period. With settlement payments on derivative positions cleared through the CME reflected as offsets to the associated derivative asset and liability balances, the fair values of derivative instruments and collateral balances shown are generally reduced. At June 30, 2017, the change resulted in a decrease of $64 million in both derivative assets/liabilities and collateral posted on the condensed consolidated statements of financial condition.

Derivatives Activity

The following table summarizes the fair value (including accrued interest) and outstanding notional amounts of derivative instruments and related collateral balances (dollars in millions):
	June 30, 2017									December 31, 2016
	Notional Amount		Number of Outstanding Derivative Contracts	Derivative Assets			Derivative Liabilities			Notional Amount		Derivative Assets			Derivative Liabilities
Derivatives designated as hedges
Interest rate swaps—cash flow hedge(1)	$	3,800	7	$	3		$	9		$	3,700	$	—		$	22
Interest rate swaps—fair value hedge(1)	$	5,645	31	2			4			$	6,208	7			72
Derivatives not designated as hedges
Foreign exchange forward contracts(2)	$	12	6	—			—			$	13	—			—
Interest rate swap	$	—	—	—			—			$	149	—			—
Total gross derivative assets/liabilities(3)				5			13					7			94
Less: Collateral held/posted(4)				(1		)	(13		)			(2		)	(94		)
Total net derivative assets/liabilities				$	4		$	—				$	5		$	—

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. The affected contracts remain term instruments and are reflected in notional amounts and number of outstanding derivative contracts.

(2) The foreign exchange forward contracts have notional amounts of EUR 7 million, GBP 2 million and SGD 1 million as of June 30, 2017 and notional amounts of EUR 6 million, GBP 5 million and SGD 1 million as of December 31, 2016.

(3) In addition to the derivatives disclosed in the table, the Company enters into forward contracts to purchase when-issued mortgage-backed securities as part of its community reinvestment initiatives. At June 30, 2017, the Company had one outstanding contract with a notional amount of $2 million and immaterial fair value. At December 31, 2016, the Company had one outstanding contract with a notional amount of $36 million and immaterial fair value.

(4) Collateral amounts, which consist of both cash and investment securities, are limited to the related derivative asset/liability balance and do not include excess collateral received/pledged. Effective in the first quarter of 2017, collateral held/posted excludes amounts that are recorded as offsets to the associated derivative asset or derivative liability balances.

The following tables summarize the impact of the derivative instruments on income and OCI and indicates where within the condensed consolidated financial statements such impact is reported (dollars in millions):
		Amount of Gain (Loss) Recognized in OCI
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow/net investment hedges
Total gain (loss) recognized in OCI after amounts reclassified into earnings, pre-tax	OCI	$	8		$	(10	)	$	19		$	(53	)
Total gain (loss) recognized in OCI		$	8		$	(10	)	$	19		$	(53	)
		Amount of (Loss) Gain Recognized in Income
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow hedges
Amount reclassified from OCI into income	Interest Expense	$	(3	)	$	(9	)	$	(8	)	$	(18	)
Total amount reclassified from OCI into income on cash flow hedges		(3		)	(9		)	(8		)	(18		)
Interest rate swaps - fair value hedges
Gain (loss) on interest rate swaps		13			13			(3		)	44
(Loss) Gain on hedged items		(12		)	(13		)	4			(44		)
Net ineffectiveness gain	Interest Expense	1			—			1			—
Increase to interest expense related to net settlements on interest rate swaps	Interest Expense	2			8			8			17
Total gain on fair value hedges		3			8			9			17
Total gain (loss) on derivatives designated as hedges recognized in income		$	—		$	(1	)	$	1		$	(1	)
Derivatives not designated as hedges
Total (loss) gain on derivatives not designated as hedges recognized in income	Other Income	$	(1	)	$	1		$	(1	)	$	—

Collateral Requirements and Credit-Risk Related Contingency Features

The Company has master netting arrangements and minimum collateral posting thresholds with its counterparties for its fair value and cash flow hedge interest rate swaps and foreign exchange forward contracts. The Company has not sought a legal opinion in relation to the enforceability of its master netting arrangements and, as such, does not report any of these positions on a net basis.Collateral is required by either the Company or its subsidiaries or the counterparty depending on the net fair value position of these derivatives held with that counterparty. The Company may also be required to post collateral with a counterparty for its fair value and cash flow hedge interest rate swaps depending on the credit rating it or Discover Bank receives from specified major credit rating agencies. Collateral receivable or payable amounts are generally not offset against the fair value of these derivatives, but are recorded separately in other assets or deposits. However, effective in the first quarter of 2017, certain cash collateral amounts related to positions cleared through an exchange are reflected as offsets to the associated derivatives balances recorded in other assets and accrued expenses and other liabilities.

At June 30, 2017, Discover Bank’s credit rating met specified thresholds set by its counterparties. However, if its credit rating is reduced by one rating notch, Discover Bank would be required to post additional collateral. The amount of additional collateral as of June 30, 2017 would have been $38 million. DFS (Parent Company) had no outstanding derivatives as of June 30, 2017, therefore, no collateral was required.

The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations.

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Segment Disclosures

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Disclosures

Segment Disclosures

The Company’s business activities are managed in two segments: Direct Banking and Payment Services.

• Direct Banking: The Direct Banking segment includes Discover-branded credit cards issued to individuals on the Discover Network and other consumer products and services, including private student loans, personal loans, home equity loans, and other consumer lending and deposit products. The majority of Direct Banking revenues relate to interest income earned on the segment's loan products. Additionally, the Company’s credit card products generate substantially all revenues related to discount and interchange, protection products and loan fee income.

• Payment Services: The Payment Services segment includes PULSE, an automated teller machine, debit and electronic funds transfer network; Diners Club, a global payments network; and the Company’s Network Partners business, which provides payment transaction processing and settlement services on the Discover Network. The majority of Payment Services revenues relate to transaction processing revenue from PULSE and royalty and licensee revenue from Diners Club.

The business segment reporting provided to and used by the Company’s chief operating decision maker is prepared using the following principles and allocation conventions:

• The Company aggregates operating segments when determining reportable segments.

• Corporate overhead is not allocated between segments; all corporate overhead is included in the Direct Banking segment.

• Through its operation of the Discover Network, the Direct Banking segment incurs fixed marketing, servicing and infrastructure costs that are not specifically allocated among the segments, with the exception of an allocation of direct and incremental costs driven by the Company's Payment Services segment.

• The assets of the Company are not allocated among the operating segments in the information reviewed by the Company’s chief operating decision maker.

• The revenues of each segment are derived from external sources. The segments do not earn revenue from intercompany sources.

• Income taxes are not specifically allocated between the operating segments in the information reviewed by the Company’s chief operating decision maker.

The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services		Total
For the Three Months Ended June 30, 2017
Interest income
Credit card loans	$	1,916	$	—	$	1,916
Private student loans	127		—		127
PCI student loans	41		—		41
Personal loans	207		—		207
Other	47		—		47
Total interest income	2,338		—		2,338
Interest expense	400		—		400
Net interest income	1,938		—		1,938
Provision for loan losses	639		1		640
Other income	408		73		481
Other expense	876		36		912
Income before income tax expense	$	831	$	36	$	867
For the Three Months Ended June 30, 2016
Interest income
Credit card loans	$	1,734	$	—	$	1,734
Private student loans	110		—		110
PCI student loans	47		—		47
Personal loans	171		—		171
Other	28		—		28
Total interest income	2,090		—		2,090
Interest expense	339		—		339
Net interest income	1,751		—		1,751
Provision for loan losses	411		1		412
Other income	396		69		465
Other expense	868		38		906
Income before income tax expense	$	868	$	30	$	898

The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services			Total
For the Six Months Ended June 30, 2017
Interest income
Credit card loans	$	3,792	$	—		$	3,792
Private student loans	251		—			251
PCI student loans	82		—			82
Personal loans	405		—			405
Other	86		—			86
Total interest income	4,616		—			4,616
Interest expense	786		—			786
Net interest income	3,830		—			3,830
Provision for loan losses	1,233		(7		)	1,226
Other income	783		145			928
Other expense	1,725		72			1,797
Income before income tax expense	$	1,655	$	80		$	1,735
For the Six Months Ended June 30, 2016
Interest income
Credit card loans	$	3,467	$	—		$	3,467
Private student loans	217		—			217
PCI student loans	96		—			96
Personal loans	338		—			338
Other	56		—			56
Total interest income	4,174		—			4,174
Interest expense	673		—			673
Net interest income	3,501		—			3,501
Provision for loan losses	834		2			836
Other income	802		137			939
Other expense	1,719		73			1,792
Income before income tax expense	$	1,750	$	62		$	1,812

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Subsequent Events

6 Months Ended

Jun. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company has evaluated events and transactions that have occurred subsequent to June 30, 2017 and determined that there were no subsequent events that would require recognition or disclosure in the condensed consolidated financial statements.

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Background and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Significant Accounting Policies

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, the financial statements reflect all adjustments which are necessary for a fair presentation of the results for the interim period. All such adjustments are of a normal, recurring nature.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and related disclosures. These estimates are based on information available as of the date of the condensed consolidated financial statements. The Company believes that the estimates used in the preparation of the condensed consolidated financial statements are reasonable. Actual results could differ from these estimates.

Fair Value of Financial Instruments

The fair values of these financial assets and liabilities, which are not carried at fair value on the condensed consolidated statements of financial condition, were determined by applying the fair value provisions discussed herein. The use of different assumptions or estimation techniques may have a material effect on these estimated fair value amounts. The following describes the valuation techniques of these financial instruments measured at other than fair value.

Cash and Cash Equivalents

The carrying value of cash and cash equivalents approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

Restricted Cash

The carrying value of restricted cash approximates fair value due to the low level of risk these assets present to the Company as well as the relatively liquid nature of these assets, particularly given their short maturities.

Held-to-Maturity Investment Securities

Held-to-maturity investment securities consist of residential mortgage-backed securities issued by agencies and municipal bonds. The fair value of residential mortgage-backed securities included in the held-to-maturity portfolio is estimated similarly to residential mortgage-backed securities carried at fair value on a recurring basis discussed herein. Municipal bonds are valued based on quoted market prices for the same or similar securities.

Net Loan Receivables

The Company's loan receivables are comprised of credit card and installment loans, including the PCI student loans. Fair value estimates are derived utilizing discounted cash flow analyses, the calculations of which are performed on groupings of loan receivables that are similar in terms of loan type and characteristics. Inputs to the cash flow analysis of each grouping consider recent prepayment trends and seasonality factors, if appropriate, as well as interest accrual estimates based on recent yields. The expected future cash flows, derived through the cash flow analysis, of each grouping are discounted at rates at which similar loans within each grouping could be originated under current market conditions. Significant inputs to the fair value measurement of the loan portfolio are unobservable and, as such, are classified as Level 3.

Accrued Interest Receivables

The carrying value of accrued interest receivables, which is included in other assets on the condensed consolidated statements of financial condition, approximates fair value as it is due in less than one year.

Deposits

The carrying values of money market deposits, savings deposits and demand deposits approximate fair value due to the potentially liquid nature of these deposits. For time deposits for which readily available market rates do not exist, fair values are estimated by discounting expected future cash flows using market rates currently offered for deposits with similar remaining maturities.

Long-Term Borrowings - Owed to Securitization Investors

Fair values of long-term borrowings owed to credit card securitization investors are determined utilizing quoted market prices of the same transactions and, as such, are classified as Level 2. Fair values of long-term borrowings owed to student loan securitization investors are calculated by discounting cash flows using estimated assumptions including, among other things, maturity and market discount rates. A portion of the difference between the carrying value and the fair value of the long-term borrowings owed to student loan securitization investors relates to purchase accounting adjustments recorded in connection with the December 2010 purchase of SLC. Significant inputs to these fair value measurements are unobservable and, as such, are classified as Level 3.

Other Long-Term Borrowings

Fair values of other long-term borrowings, consisting of subordinated and senior debt, are determined utilizing current observable market prices for those transactions and, as such, are classified as Level 2. A portion of the difference between the carrying value and the fair value of other long-term borrowings relates to the cash premiums paid in connection with the 2012 fiscal year debt exchanges.

Accrued Interest Payables

The carrying value of accrued interest payables, which is included in accrued expenses and other liabilities on the condensed consolidated statements of financial condition, approximates fair value as it is payable in less than one year.

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Investments (Tables)

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities

The Company’s investment securities consist of the following (dollars in millions):
	June 30, 2017		December 31, 2016
U.S. Treasury securities(1)	$	672	$	674
States and political subdivisions of states	1		2
Residential mortgage-backed securities - Agency(2)	1,006		1,081
Total investment securities	$	1,679	$	1,757

(1) Includes $37 million and $73 million of U.S. Treasury securities pledged as swap collateral as of June 30, 2017 and December 31, 2016, respectively.

(2) Consists of residential mortgage-backed securities issued by Fannie Mae, Freddie Mac and Ginnie Mae.

Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value

The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale and held-to-maturity investment securities are as follows (dollars in millions):
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At June 30, 2017
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(4	)	$	672
Residential mortgage-backed securities - Agency	827		3		(3		)	827
Total available-for-sale investment securities	$	1,503	$	3	$	(7	)	$	1,499
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	1	$	—	$	—		$	1
Residential mortgage-backed securities - Agency(3)	179		1		(1		)	179
Total held-to-maturity investment securities	$	180	$	1	$	(1	)	$	180
At December 31, 2016
Available-for-Sale Investment Securities(1)
U.S. Treasury securities	$	676	$	—	$	(2	)	$	674
Residential mortgage-backed securities - Agency	934		2		(5		)	931
Total available-for-sale investment securities	$	1,610	$	2	$	(7	)	$	1,605
Held-to-Maturity Investment Securities(2)
States and political subdivisions of states	$	2	$	—	$	—		$	2
Residential mortgage-backed securities - Agency(3)	150		1		(1		)	150
Total held-to-maturity investment securities	$	152	$	1	$	(1	)	$	152

(1) Available-for-sale investment securities are reported at fair value.

(2) Held-to-maturity investment securities are reported at amortized cost.

(3) Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.

Schedule of Fair Value of Securities in a Continuous Unrealized Loss Position for Less Than 12 Months and More Than 12 Months

The following table provides information about investment securities with aggregate gross unrealized losses and the length of time that individual investment securities have been in a continuous unrealized loss position (dollars in millions):
	Number of Securities in a Loss Position	Less than 12 months					More than 12 months
		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
At June 30, 2017
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	672	$	(4	)	$	—	$	—
Residential mortgage-backed securities - Agency	15	$	376	$	(2	)	$	46	$	(1	)
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	38	$	88	$	(1	)	$	—	$	—
At December 31, 2016
Available-for-Sale Investment Securities
U.S. Treasury securities	1	$	674	$	(2	)	$	—	$	—
Residential mortgage-backed securities - Agency	19	$	586	$	(5	)	$	—	$	—
Held-to-Maturity Investment Securities
Residential mortgage-backed securities - Agency	31	$	61	$	(1	)	$	—	$	—

Schedule of Proceeds, Recognized Gains and Losses and Net Unrealized Gains and Losses

The following table provides information about proceeds from sales, recognized gains and losses and net unrealized gains and losses on available-for-sale securities (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Net unrealized gain recorded in other comprehensive income, before-tax	$	—	$	6	$	2	$	29
Net unrealized gain recorded in other comprehensive income, after-tax	$	—	$	4	$	1	$	18

Schedule of Maturities of Available-for-Sale Debt Securities and Held-to-Maturity Debt Securities

Maturities of available-for-sale debt securities and held-to-maturity debt securities are provided in the table below (dollars in millions):
	One Year or Less		After One Year Through Five Years		After Five Years Through Ten Years		After Ten Years		Total
At June 30, 2017
Available-for-Sale Investment Securities—Amortized Cost
U.S. Treasury securities	$	—	$	676	$	—	$	—	$	676
Residential mortgage-backed securities - Agency	—		73		560		194		827
Total available-for-sale investment securities	$	—	$	749	$	560	$	194	$	1,503
Held-to-Maturity Investment Securities—Amortized Cost
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180
Available-for-Sale Investment Securities—Fair Values
U.S. Treasury securities	$	—	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		73		559		195		827
Total available-for-sale investment securities	$	—	$	745	$	559	$	195	$	1,499
Held-to-Maturity Investment Securities—Fair Values
State and political subdivisions of states	$	—	$	—	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		—		—		179		179
Total held-to-maturity investment securities	$	—	$	—	$	—	$	180	$	180

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Loan Receivables (Tables)

6 Months Ended

Jun. 30, 2017

Loans and Leases Receivable Disclosure [Abstract]

Schedule of Loan Receivables

The Company's classes of receivables within the three portfolio segments are depicted in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Loan receivables
Credit card loans(1)	$	61,797		$	61,522
Other loans
Personal loans	6,955			6,481
Private student loans	6,594			6,393
Other	329			274
Total other loans	13,878			13,148
PCI loans(2)	2,322			2,584
Total loan receivables	77,997			77,254
Allowance for loan losses	(2,384		)	(2,167		)
Net loan receivables	$	75,613		$	75,087

(1) Amounts include $21.2 billion and $20.8 billion underlying investors’ interest in trust debt at June 30, 2017 and December 31, 2016, respectively, and $8.9 billion and $10.8 billion in seller's interest at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

(2) Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

Schedule of Delinquent and Non-Accruing Loans

Information related to the delinquent and non-accruing loans in the Company’s loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading “— Purchased Credit-Impaired Loans” (dollars in millions):
	30-89 Days Delinquent		90 or More Days Delinquent		Total Past Due		90 or More Days Delinquent and Accruing		Total Non-accruing(1)
At June 30, 2017
Credit card loans(2)	$	634	$	603	$	1,237	$	540	$	206
Other loans
Personal loans(3)	57		21		78		20		10
Private student loans (excluding PCI)(4)	98		42		140		42		—
Other	1		1		2		—		10
Total other loans (excluding PCI)	156		64		220		62		20
Total loan receivables (excluding PCI)	$	790	$	667	$	1,457	$	602	$	226
At December 31, 2016
Credit card loans(2)	$	655	$	597	$	1,252	$	544	$	189
Other loans
Personal loans(3)	55		19		74		18		8
Private student loans (excluding PCI)(4)	106		35		141		35		—
Other	1		1		2		—		19
Total other loans (excluding PCI)	162		55		217		53		27
Total loan receivables (excluding PCI)	$	817	$	652	$	1,469	$	597	$	216

(1) The Company estimates that the gross interest income that would have been recorded in accordance with the original terms of non-accruing credit card loans was $9 million and $7 million for the three months ended June 30, 2017 and 2016, respectively, and $17 million and $15 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not separately track the amount of gross interest income that would have been recorded in accordance with the original terms of loans. This amount was estimated based on customers' current balances and most recent interest rates.

(2) Credit card loans that are 90 or more days delinquent and accruing interest include $61 million and $58 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(3) Personal loans that are 90 or more days delinquent and accruing interest include $3 million and $2 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

(4) Private student loans that are 90 or more days delinquent and accruing interest include $5 million and $3 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016.

Schedule of Net Charge-offs

Information related to the net charge-offs in the Company's loan portfolio is shown below by each class of loan receivables except for PCI student loans, which is shown under the heading "— Purchased Credit-Impaired Loans" (dollars in millions):
	For the Three Months Ended June 30,
	2017				2016
	Net Charge-offs		Net  Charge-off Rate(1)		Net Charge-offs		Net  Charge-off Rate(1)
Credit card loans	$	445	2.94	%	$	334	2.39	%
Other loans
Personal loans	54		3.18	%	33		2.38	%
Private student loans (excluding PCI)	20		1.15	%	17		1.10	%
Other	1		0.30	%	—		—	%
Total other loans	75		2.14	%	50		1.68	%
Net charge-offs (excluding PCI)	$	520	2.79	%	$	384	2.27	%
Net charge-offs (including PCI)	$	520	2.71	%	$	384	2.18	%
	For the Six Months Ended June 30,
	2017				2016
	Net Charge-off Dollars		Net  Charge-off Rate(1)		Net Charge-off Dollars		Net  Charge-off Rate(1)
Credit card loans	$	867	2.89	%	$	660	2.37	%
Other loans
Personal loans	105		3.17	%	67		2.41	%
Private student loans (excluding PCI)	34		0.99	%	29		0.98	%
Other	3		1.79	%	—		—	%
Total other loans	142		2.08	%	96		1.64	%
Net charge-offs (excluding PCI)	$	1,009	2.74	%	$	756	2.24	%
Net charge-offs (including PCI)	$	1,009	2.65	%	$	756	2.15	%

(1) Net charge-off rate represents net charge-off dollars (annualized) divided by average loans for the reporting period.

Schedule of Credit Risk Profile by FICO Score

The following table provides the most recent FICO scores available for the Company’s customers as a percentage of each class of loan receivables:
	Credit Risk Profile by FICO Score
	660 and  Above		Less than 660 or No Score
At June 30, 2017
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	96	%	4	%
At December 31, 2016
Credit card loans	82	%	18	%
Personal loans	96	%	4	%
Private student loans (excluding PCI)(1)	95	%	5	%

(1) PCI loans are discussed under the heading "— Purchased Credit-Impaired Loans."

Schedule of Changes in the Allowance for Loan Losses

The following tables provide changes in the Company’s allowance for loan losses (dollars in millions):
	For the Three Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,892		$	207		$	156		$	9		$	2,264
Additions
Provision for loan losses	533			82			23			2			640
Deductions
Charge-offs	(561		)	(61		)	(22		)	(1		)	(645		)
Recoveries	116			7			2			—			125
Net charge-offs	(445		)	(54		)	(20		)	(1		)	(520		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Three Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,590		$	165		$	148		$	18		$	1,921
Additions
Provision for loan losses	347			44			20			1			412
Deductions
Charge-offs	(448		)	(38		)	(19		)	—			(505		)
Recoveries	114			5			2			—			121
Net charge-offs	(334		)	(33		)	(17		)	—			(384		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949
	For the Six Months Ended June 30, 2017
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,790		$	200		$	158		$	19		$	2,167
Additions
Provision for loan losses	1,057			140			35			(6		)	1,226
Deductions
Charge-offs	(1,096		)	(118		)	(39		)	(3		)	(1,256		)
Recoveries	229			13			5			—			247
Net charge-offs	(867		)	(105		)	(34		)	(3		)	(1,009		)
Balance at end of period	$	1,980		$	235		$	159		$	10		$	2,384
	For the Six Months Ended June 30, 2016
	Credit Card			Personal Loans			Student Loans(1)			Other			Total
Balance at beginning of period	$	1,554		$	155		$	143		$	17		$	1,869
Additions
Provision for loan losses	709			88			37			2			836
Deductions
Charge-offs	(887		)	(77		)	(34		)	—			(998		)
Recoveries	227			10			5			—			242
Net charge-offs	(660		)	(67		)	(29		)	—			(756		)
Balance at end of period	$	1,603		$	176		$	151		$	19		$	1,949

(1) Includes both PCI and non-PCI private student loans.

Schedule of Net Charge-offs of Interest and Fee Revenues on Loan Receivables

Net charge-offs of principal are recorded against the allowance for loan losses, as shown in the preceding table. Information regarding net charge-offs of interest and fee revenues on credit card and other loans is as follows (dollars in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Interest and fees accrued subsequently charged off, net of recoveries (recorded as a reduction of interest income)	$	87	$	67	$	171	$	136
Fees accrued subsequently charged off, net of recoveries (recorded as a reduction to other income)	$	23	$	17	$	45	$	34

Schedule of Allowance for Loan Losses and Recorded Investment in its Loan Portfolio by Impairment Methodology

The following tables provide additional detail of the Company’s allowance for loan losses and recorded investment in its loan portfolio by impairment methodology (dollars in millions):
	Credit Card		Personal Loans		Student Loans(1)		Other Loans		Total
At June 30, 2017
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,789	$	210	$	106	$	3	$	2,108
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	191		25		20		7		243
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		33		—		33
Total allowance for loan losses	$	1,980	$	235	$	159	$	10	$	2,384
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,649	$	6,863	$	6,479	$	283	$	74,274
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,148		92		115		46		1,401
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,322		—		2,322
Total recorded investment	$	61,797	$	6,955	$	8,916	$	329	$	77,997
At December 31, 2016
Allowance for loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	1,623	$	179	$	105	$	3	$	1,910
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	167		21		18		16		222
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		35		—		35
Total allowance for loan losses	$	1,790	$	200	$	158	$	19	$	2,167
Recorded investment in loans evaluated for impairment as
Collectively evaluated for impairment in accordance with ASC 450-20	$	60,437	$	6,400	$	6,307	$	219	$	73,363
Evaluated for impairment in accordance with ASC 310-10-35(2)(3)	1,085		81		86		55		1,307
Acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	—		—		2,584		—		2,584
Total recorded investment	$	61,522	$	6,481	$	8,977	$	274	$	77,254

(1) Includes both PCI and non-PCI private student loans.

(2) Loan receivables evaluated for impairment in accordance with Accounting Standards Codification ("ASC") 310-10-35 include credit card loans, personal loans and student loans collectively evaluated for impairment in accordance with ASC Subtopic 310-40, Receivables, which consists of modified loans accounted for as troubled debt restructurings. Other loans are individually evaluated for impairment and generally do not represent troubled debt restructurings.

(3) The unpaid principal balance of credit card loans was $994 million and $935 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of personal loans was $91 million and $79 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of student loans was $113 million and $84 million at June 30, 2017 and December 31, 2016, respectively. All loans accounted for as troubled debt restructurings have a related allowance for loan losses.

Schedule of Troubled Debt Restructurings

Additional information about modified loans classified as troubled debt restructurings is shown below (dollars in millions):
	Average recorded investment in loans		Interest income recognized during period loans were impaired(1)		Gross interest income that would have been recorded with original terms(2)
For the Three Months Ended June 30, 2017
Credit card loans(3)	$	1,137	$	25	$	22
Personal loans	$	90	$	3	$	1
Private student loans(4)	$	107	$	1	$	—
For the Three Months Ended June 30, 2016
Credit card loans(3)	$	1,016	$	22	$	19
Personal loans	$	71	$	2	$	—
Private student loans(4)	$	53	$	1	N/A
For the Six Months Ended June 30, 2017
Credit card loans(3)	$	1,122	$	50	$	42
Personal loans	$	87	$	5	$	2
Private student loans(4)	$	101	$	3	$	—
For the Six Months Ended June 30, 2016
Credit card loans(3)	$	1,019	$	42	$	39
Personal loans	$	70	$	4	$	1
Private student loans(4)	$	52	$	2	N/A

(1) The Company does not separately track interest income on loans in modification programs. Amounts shown are estimated by applying an average interest rate to the average loans in the various modification programs.

(2) The Company does not separately track the amount of additional gross interest income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. Amounts shown are estimated by applying the difference between the average interest rate earned on non-impaired loans and the average interest rate earned on loans in the modification programs to the average loans in the modification programs.

(3) Includes credit card loans that were modified in troubled debt restructurings, but are no longer enrolled in a troubled debt restructuring program due to noncompliance with the terms of the modification or successful completion of a program. The average balance of credit card loans that were no longer enrolled in a troubled debt restructuring program was $324 million and $274 million, respectively, for the three months ended June 30, 2017 and 2016, and $317 million and $274 million for the six months ended June 30, 2017 and 2016.

(4) As a result of the updates implemented in the third quarter of 2016, some student loans accounted for as troubled debt restructurings have additional gross income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. For the three and six months ended June 30, 2017, the gross income that would have been recorded with original terms for student loans in modification programs was not material.

Schedule of Loans That Entered a Modification Program During the Period

The following table provides information on loans that entered a loan modification program during the period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	26,078	$	157	19,780	$	118
Personal loans	1,430	$	18	1,027	$	12
Private student loans	1,003	$	18	289	$	4
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Balances		Number of Accounts	Balances
Accounts that entered a loan modification program during the period
Credit card loans	56,971	$	338	42,064	$	253
Personal loans	2,993	$	36	2,088	$	24
Private student loans	2,020	$	35	741	$	12

Schedule of Troubled Debt Restructurings That Subsequently Defaulted

The following table presents the carrying value of loans that experienced a payment default during the period that had been modified in a troubled debt restructuring during the 15 months preceding the end of each period (dollars in millions):
	For the Three Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	8,049	$	43	4,380	$	23
Personal loans(2)	341	$	4	276	$	3
Private student loans(3)	184	$	3	177	$	3
	For the Six Months Ended June 30,
	2017			2016
	Number of Accounts	Aggregated Outstanding Balances Upon Default		Number of Accounts	Aggregated Outstanding Balances Upon Default
Troubled debt restructurings that subsequently defaulted
Credit card loans(1)(2)	16,215	$	87	9,080	$	48
Personal loans(2)	648	$	8	434	$	5
Private student loans(3)	369	$	6	374	$	6

(1) Terms revert back to the pre-modification terms for customers who default from a temporary program and charging privileges remain revoked in most cases.

(2) For credit card loans and personal loans, a customer defaults from a modification program after two consecutive missed payments. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

(3) For student loans, defaults have been defined as loans that are 60 or more days delinquent. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

Schedule of Changes in Accretable Yield for the Acquired Loans

The following table provides changes in accretable yield for the acquired loans during each period (dollars in millions):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	755		$	916		$	796		$	965
Accretion into interest income	(40		)	(47		)	(81		)	(96		)
Other changes in expected cash flows	10			19			10			19
Balance at end of period	$	725		$	888		$	725		$	888

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Credit Card and Student Loan Securitization Activities (Tables)

6 Months Ended

Jun. 30, 2017

Variable Interest Entities Disclosure [Abstract]

Schedule of Restricted Credit Card Securitized Assets [Text Block]

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	26		$	23
Investors’ interests held by third-party investors	16,100			15,625
Investors’ interests held by wholly-owned subsidiaries of Discover Bank	5,113			5,189
Seller’s interest	8,894			10,812
Loan receivables(1)	30,107			31,626
Allowance for loan losses allocated to securitized loan receivables(1)	(970		)	(928		)
Net loan receivables	29,137			30,698
Other	5			4
Carrying value of assets of consolidated variable interest entities	$	29,168		$	30,725

(1) The Company maintains its allowance for loan losses at an amount sufficient to absorb probable losses inherent in all loan receivables, which includes all loan receivables in the trusts. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company’s balance sheet in accordance with GAAP.

Schedule of Restricted Student Loan Securitized Assets [Text Block]

The carrying values of these restricted assets, which are presented on the Company’s condensed consolidated statements of financial condition as relating to securitization activities, are shown in the table below (dollars in millions):
	June 30, 2017			December 31, 2016
Restricted cash	$	67		$	72
Student loan receivables(1)	1,249			1,390
Allowance for loan losses allocated to securitized loan receivables(1)	(25		)	(27		)
Net student loan receivables	1,224			1,363
Carrying value of assets of consolidated variable interest entities	$	1,291		$	1,435

(1) The Company maintains its allowance for loan losses on PCI loans sufficient to absorb probable decreases in cash flows that were previously expected. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company's balance sheet in accordance with GAAP.

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Deposits (Tables)

6 Months Ended

Jun. 30, 2017

Deposits [Abstract]

Schedule of Interest Bearing Deposit Accounts

The following table provides a summary of interest-bearing deposit accounts (dollars in millions):
	June 30, 2017		December 31, 2016
Certificates of deposit in amounts less than $100,000	$	19,597	$	20,225
Certificates of deposit in amounts $100,000 or greater(1)	5,977		5,864
Savings deposits, including money market deposit accounts	26,785		25,372
Total interest-bearing deposits	$	52,359	$	51,461

(1) Includes $1.4 billion in certificates of deposit greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of June 30, 2017 and December 31, 2016.

Schedule of $100,000 or More Certificates of Deposit Maturities

The following table summarizes certificates of deposit in amounts of $100,000 or greater by contractual maturity (dollars in millions):
Maturity Period	June 30, 2017
Three months or less	$	899
Over three months through six months	811
Over six months through twelve months	1,574
Over twelve months	2,693
Total	$	5,977

Schedule of Certificates of Deposit Maturities

The following table summarizes certificates of deposit maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	5,966
2018	8,193
2019	3,435
2020	2,671
2021	1,879
Thereafter	3,430
Total	$	25,574

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Long-Term Borrowings (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of Long-Term Borrowings and Weighted Average Interest Rates

Long-term borrowings consist of borrowings having original maturities of one year or more. The following table provides a summary of the Company’s long-term borrowings and weighted-average interest rates on outstanding balances (dollars in millions):
	June 30, 2017					December 31, 2016
	Maturity	Interest Rate	Weighted-Average Interest Rate	Outstanding Amount		Outstanding Amount
Securitized Debt
Fixed-rate asset-backed securities(1)	2017-2024	1.39%-5.65%	2.17%	$	9,818	$	9,868
Floating-rate asset-backed securities(2)(3)	2018-2024	1.39%-1.83%	1.60%	6,212		5,694
Total Discover Card Master Trust I and Discover Card Execution Note Trust				16,030		15,562
Floating-rate asset-backed securities(4)(5)(6)(7)	2031-2042	1.33%-5.00%	2.81%	708		849
Total SLC Private Student Loan Trusts				708		849
Total long-term borrowings - owed to securitization investors				16,738		16,411
Discover Financial Services (Parent Company)
Fixed-rate senior notes(1)	2019-2027	3.75%-10.25%	4.25%	2,695		2,090
Fixed-rate retail notes	2017-2031	2.85%-4.40%	3.70%	227		169
Discover Bank
Fixed-rate senior bank notes(1)	2018-2026	2.00%-4.25%	3.21%	6,081		6,077
Fixed-rate subordinated bank notes	2019-2020	7.00%-8.70%	7.49%	697		696
Total long-term borrowings				$	26,438	$	25,443

(1) The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in London Interbank Offered Rate (“LIBOR”). Use of these interest rate swaps impacts carrying value of the debt.

(2) Discover Card Execution Note Trust floating-rate asset-backed securities include issuances with the following interest rate terms: 1-month LIBOR + 23 to 60 basis points as of June 30, 2017.

(3) The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on a portion of these long-term borrowings. There is no impact on debt carrying value from use of these interest rate swaps. See Note 14: Derivatives and Hedging Activities for additional information.

(4) SLC Private Student Loan Trusts floating-rate asset-backed securities include issuances with the following interest rate terms: 3-month LIBOR + 17 to 45 basis points, Prime rate + 75 to 100 basis points and 1-month LIBOR + 350 basis points as of June 30, 2017.

(5) The Company acquired an interest rate swap related to the securitized debt assumed in the SLC transaction which matured and is no longer outstanding as of June 30, 2017. The swap did not qualify for hedge accounting and had no impact on debt carrying value. See Note 14: Derivatives and Hedging Activities for additional information.

(6) Repayment of this debt is dependent upon the timing of principal and interest payments on the underlying student loans. The dates shown represent final maturity dates.

(7) Includes $255 million of senior notes maturing in 2031, $436 million of senior and subordinated notes maturing in 2036 and $17 million of senior notes maturing in 2042 as of June 30, 2017.

Schedule of Long-Term Borrowings Maturities

The following table summarizes long-term borrowings maturing over the remainder of this year, over each of the next four years, and thereafter (dollars in millions):
Year	June 30, 2017
2017	$	2,201
2018	5,269
2019	5,991
2020	3,433
2021	1,040
Thereafter	8,504
Total	$	26,438

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Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Income (Loss)

Changes in each component of accumulated other comprehensive income (loss) ("AOCI") were as follows (dollars in millions):
	Unrealized (Loss) Gain on Available-for-Sale Investment Securities, Net of Tax			(Loss) Gain on Cash Flow Hedges, Net of Tax			Pension Plan Loss, Net of Tax			AOCI
For the Three Months Ended June 30, 2017
Balance at March 31, 2017	$	(2	)	$	(8	)	$	(145	)	$	(155	)
Net change	—			5			—			5
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Three Months Ended June 30, 2016
Balance at March 31, 2016	$	14		$	(46	)	$	(140	)	$	(172	)
Net change	4			(6		)	—			(2		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)
For the Six Months Ended June 30, 2017
Balance at December 31, 2016	$	(3	)	$	(13	)	$	(145	)	$	(161	)
Net change	1			10			—			11
Balance at June 30, 2017	$	(2	)	$	(3	)	$	(145	)	$	(150	)
For the Six Months Ended June 30, 2016
Balance at December 31, 2015	$	—		$	(20	)	$	(140	)	$	(160	)
Net change	18			(32		)	—			(14		)
Balance at June 30, 2016	$	18		$	(52	)	$	(140	)	$	(174	)

Schedule of Other Comprehensive Income Before Reclassifications and Amounts Reclassified from AOCI

The table below presents each component of other comprehensive income (loss) ("OCI") before reclassifications and amounts reclassified from AOCI for each component of OCI before- and after-tax (dollars in millions):
	Before Tax			Tax (Expense) Benefit			Net of Tax
For the Three Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain (loss) arising during the period	$	—		$	—		$	—
Net change	$	—		$	—		$	—
Cash Flow Hedges
Net unrealized gain arising during the period	$	3		$	(1	)	$	2
Amounts reclassified from AOCI	3			—			3
Net change	$	6		$	(1	)	$	5
For the Three Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	6		$	(2	)	$	4
Net change	$	6		$	(2	)	$	4
Cash Flow Hedges
Net unrealized loss arising during the period	$	(18	)	$	6		$	(12	)
Amounts reclassified from AOCI	9			(3		)	6
Net change	$	(9	)	$	3		$	(6	)
For the Six Months Ended June 30, 2017
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	2		$	(1	)	$	1
Net change	$	2		$	(1	)	$	1
Cash Flow Hedges
Net unrealized gain arising during the period	$	9		$	(4	)	$	5
Amounts reclassified from AOCI	8			(3		)	5
Net change	$	17		$	(7	)	$	10
For the Six Months Ended June 30, 2016
Available-for-Sale Investment Securities
Net unrealized holding gain arising during the period	$	29		$	(11	)	$	18
Net change	$	29		$	(11	)	$	18
Cash Flow Hedges
Net unrealized loss arising during the period	$	(70	)	$	27		$	(43	)
Amounts reclassified from AOCI	18			(7		)	11
Net change	$	(52	)	$	20		$	(32	)

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Calculation

The following table presents the calculation of the Company's effective income tax rate (dollars in millions, except effective income tax rate):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Income before income tax expense	$	867		$	898		$	1,735		$	1,812
Income tax expense	$	321		$	282		$	625		$	621
Effective income tax rate	37.1		%	31.4		%	36.0		%	34.3		%

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of Basic and Diluted EPS

The following table presents the calculation of basic and diluted earnings per share ("EPS") (in millions, except per share amounts):
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
Numerator
Net income	$	546		$	616		$	1,110		$	1,191
Preferred stock dividends	(10		)	(10		)	(19		)	(19		)
Net income available to common stockholders	536			606			1,091			1,172
Income allocated to participating securities	(4		)	(4		)	(8		)	(8		)
Net income allocated to common stockholders	$	532		$	602		$	1,083		$	1,164
Denominator
Weighted-average shares of common stock outstanding	379			410			382			414
Effect of dilutive common stock equivalents	—			1			—			—
Weighted-average shares of common stock outstanding and common stock equivalents	379			411			382			414
Basic earnings per common share	$	1.41		$	1.47		$	2.83		$	2.81
Diluted earnings per common share	$	1.40		$	1.47		$	2.83		$	2.81

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Capital Adequacy (Tables)

6 Months Ended

Jun. 30, 2017

Regulatory Capital Requirements [Abstract]

Schedule of Minimum and Well-Capitalized Requirements

The following table shows the actual capital amounts and ratios of the Company and Discover Bank and comparisons of each to the regulatory minimum and “well-capitalized” requirements (dollars in millions):
	Actual				Minimum Capital Requirements			Capital Requirements To Be Classified as Well-Capitalized
	Amount		Ratio		Amount		Ratio	Amount(1)		Ratio(1)
June 30, 2017
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,263	15.2	%	$	6,436	≥8.0%	$	8,045	≥10.0%
Discover Bank	$	12,392	15.5	%	$	6,376	≥8.0%	$	7,970	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,052	13.7	%	$	4,827	≥6.0%	$	4,827	≥6.0%
Discover Bank	$	10,600	13.3	%	$	4,782	≥6.0%	$	6,376	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,052	11.8	%	$	3,742	≥4.0%	N/A		N/A
Discover Bank	$	10,600	11.4	%	$	3,710	≥4.0%	$	4,637	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,492	13.0	%	$	3,620	≥4.5%	N/A		N/A
Discover Bank	$	10,600	13.3	%	$	3,587	≥4.5%	$	5,181	≥6.5%
December 31, 2016
Total capital (to risk-weighted assets)
Discover Financial Services	$	12,445	15.5	%	$	6,408	≥8.0%	$	8,010	≥10.0%
Discover Bank	$	12,334	15.5	%	$	6,346	≥8.0%	$	7,932	≥10.0%
Tier 1 capital (to risk-weighted assets)
Discover Financial Services	$	11,152	13.9	%	$	4,806	≥6.0%	$	4,806	≥6.0%
Discover Bank	$	10,450	13.2	%	$	4,759	≥6.0%	$	6,346	≥8.0%
Tier 1 capital (to average assets)
Discover Financial Services	$	11,152	12.3	%	$	3,624	≥4.0%	N/A		N/A
Discover Bank	$	10,450	11.6	%	$	3,591	≥4.0%	$	4,488	≥5.0%
CET1 capital (to risk-weighted assets) (Basel III transition)
Discover Financial Services	$	10,592	13.2	%	$	3,604	≥4.5%	N/A		N/A
Discover Bank	$	10,450	13.2	%	$	3,570	≥4.5%	$	5,156	≥6.5%

(1) The Basel III rules do not establish well-capitalized thresholds for these measures for bank holding companies. Existing well-capitalized thresholds established in the Federal Reserve's Regulation Y have been included where available.

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Commitments, Contingencies and Guarantees (Tables)

6 Months Ended

Jun. 30, 2017

Guarantor Obligations [Line Items]

Schedule of Lease Commitments

The Company leases various office space and equipment under capital and non-cancelable operating leases, which expire at various dates through 2028. Future minimum payments on capital leases were not material at June 30, 2017. The following table shows future minimum payments on non-cancelable operating leases with original terms in excess of one year (dollars in millions):
	June 30, 2017
2017	$	6
2018	12
2019	11
2020	10
2021	9
Thereafter	41
Total minimum lease payments	$	89

Merchant Chargeback Guarantees [Member]

Guarantor Obligations [Line Items]

Schedule of Maximum Potential Counterparty Exposures Related to Settlement Guarantees and Merchant Chargeback Guarantee

The table below summarizes certain information regarding merchant chargeback guarantees (in millions):
	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Aggregate sales transaction volume(1)	$	35,885	$	34,634	$	68,539	$	65,915

(1) Represents period transactions processed on the Discover Network for which a potential liability exists that, in aggregate, can differ from credit card sales volume.

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Fair Value Measurements and Disclosures (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are as follows (dollars in millions):
	Quoted Price in Active Markets for Identical Assets  (Level 1)		Significant Other Observable Inputs  (Level 2)		Significant Unobservable Inputs  (Level 3)		Total
Balance at June 30, 2017
Assets
U.S. Treasury securities	$	672	$	—	$	—	$	672
Residential mortgage-backed securities - Agency	—		827		—		827
Available-for-sale investment securities	$	672	$	827	$	—	$	1,499
Derivative financial instruments(1)	$	—	$	5	$	—	$	5
Liabilities
Derivative financial instruments(1)	$	—	$	13	$	—	$	13
Balance at December 31, 2016
Assets
U.S. Treasury securities	$	674	$	—	$	—	$	674
Residential mortgage-backed securities - Agency	—		931		—		931
Available-for-sale investment securities	$	674	$	931	$	—	$	1,605
Derivative financial instruments	$	—	$	7	$	—	$	7
Liabilities
Derivative financial instruments	$	—	$	94	$	—	$	94

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. See Note 14: Derivatives and Hedging Activities for additional information.

Schedule of Financial Instruments Measured at Other Than Fair Value

The following tables disclose the estimated fair value of the Company's financial assets and financial liabilities that are not required to be carried at fair value (dollars in millions):
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Carrying Value
Balance at June 30, 2017
Assets
States and political subdivisions of states	$	—	$	1	$	—	$	1	$	1
Residential mortgage-backed securities - Agency	—		179		—		179		179
Held-to-maturity investment securities	$	—	$	180	$	—	$	180	$	180
Cash and cash equivalents	$	12,950	$	—	$	—	$	12,950	$	12,950
Restricted cash	$	93	$	—	$	—	$	93	$	93
Net loan receivables	$	—	$	—	$	78,819	$	78,819	$	75,613
Accrued interest receivables	$	—	$	746	$	—	$	746	$	746
Liabilities
Deposits	$	—	$	53,024	$	—	$	53,024	$	52,864
Long-term borrowings - owed to securitization investors	$	—	$	16,127	$	743	$	16,870	$	16,738
Other long-term borrowings	$	—	$	10,222	$	—	$	10,222	$	9,700
Accrued interest payables	$	—	$	191	$	—	$	191	$	191
Balance at December 31, 2016
Assets
States and political subdivisions of states	$	—	$	2	$	—	$	2	$	2
Residential mortgage-backed securities - Agency	—		150		—		150		150
Held-to-maturity investment securities	$	—	$	152	$	—	$	152	$	152
Cash and cash equivalents	$	11,914	$	—	$	—	$	11,914	$	11,914
Restricted cash	$	95	$	—	$	—	$	95	$	95
Net loan receivables	$	—	$	—	$	78,252	$	78,252	$	75,087
Accrued interest receivables	$	—	$	724	$	—	$	724	$	724
Liabilities
Deposits	$	—	$	52,183	$	—	$	52,183	$	51,992
Long-term borrowings - owed to securitization investors	$	—	$	15,617	$	900	$	16,517	$	16,411
Other long-term borrowings	$	—	$	9,470	$	—	$	9,470	$	9,032
Accrued interest payables	$	—	$	168	$	—	$	168	$	168

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Derivatives and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value and Outstanding Notional Amounts of Derivative Instruments and Related Collateral Balances

The following table summarizes the fair value (including accrued interest) and outstanding notional amounts of derivative instruments and related collateral balances (dollars in millions):
	June 30, 2017									December 31, 2016
	Notional Amount		Number of Outstanding Derivative Contracts	Derivative Assets			Derivative Liabilities			Notional Amount		Derivative Assets			Derivative Liabilities
Derivatives designated as hedges
Interest rate swaps—cash flow hedge(1)	$	3,800	7	$	3		$	9		$	3,700	$	—		$	22
Interest rate swaps—fair value hedge(1)	$	5,645	31	2			4			$	6,208	7			72
Derivatives not designated as hedges
Foreign exchange forward contracts(2)	$	12	6	—			—			$	13	—			—
Interest rate swap	$	—	—	—			—			$	149	—			—
Total gross derivative assets/liabilities(3)				5			13					7			94
Less: Collateral held/posted(4)				(1		)	(13		)			(2		)	(94		)
Total net derivative assets/liabilities				$	4		$	—				$	5		$	—

(1) Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. The affected contracts remain term instruments and are reflected in notional amounts and number of outstanding derivative contracts.

(2) The foreign exchange forward contracts have notional amounts of EUR 7 million, GBP 2 million and SGD 1 million as of June 30, 2017 and notional amounts of EUR 6 million, GBP 5 million and SGD 1 million as of December 31, 2016.

(3) In addition to the derivatives disclosed in the table, the Company enters into forward contracts to purchase when-issued mortgage-backed securities as part of its community reinvestment initiatives. At June 30, 2017, the Company had one outstanding contract with a notional amount of $2 million and immaterial fair value. At December 31, 2016, the Company had one outstanding contract with a notional amount of $36 million and immaterial fair value.

(4) Collateral amounts, which consist of both cash and investment securities, are limited to the related derivative asset/liability balance and do not include excess collateral received/pledged. Effective in the first quarter of 2017, collateral held/posted excludes amounts that are recorded as offsets to the associated derivative asset or derivative liability balances.

Schedule of Impact of the Derivative Instruments on Income and Other Comprehensive Income

The following tables summarize the impact of the derivative instruments on income and OCI and indicates where within the condensed consolidated financial statements such impact is reported (dollars in millions):
		Amount of Gain (Loss) Recognized in OCI
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow/net investment hedges
Total gain (loss) recognized in OCI after amounts reclassified into earnings, pre-tax	OCI	$	8		$	(10	)	$	19		$	(53	)
Total gain (loss) recognized in OCI		$	8		$	(10	)	$	19		$	(53	)
		Amount of (Loss) Gain Recognized in Income
		For the Three Months Ended June 30,						For the Six Months Ended June 30,
	Location	2017			2016			2017			2016
Derivatives designated as hedges
Interest rate swaps - cash flow hedges
Amount reclassified from OCI into income	Interest Expense	$	(3	)	$	(9	)	$	(8	)	$	(18	)
Total amount reclassified from OCI into income on cash flow hedges		(3		)	(9		)	(8		)	(18		)
Interest rate swaps - fair value hedges
Gain (loss) on interest rate swaps		13			13			(3		)	44
(Loss) Gain on hedged items		(12		)	(13		)	4			(44		)
Net ineffectiveness gain	Interest Expense	1			—			1			—
Increase to interest expense related to net settlements on interest rate swaps	Interest Expense	2			8			8			17
Total gain on fair value hedges		3			8			9			17
Total gain (loss) on derivatives designated as hedges recognized in income		$	—		$	(1	)	$	1		$	(1	)
Derivatives not designated as hedges
Total (loss) gain on derivatives not designated as hedges recognized in income	Other Income	$	(1	)	$	1		$	(1	)	$	—

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Segment Disclosures (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Disclosures

The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services		Total
For the Three Months Ended June 30, 2017
Interest income
Credit card loans	$	1,916	$	—	$	1,916
Private student loans	127		—		127
PCI student loans	41		—		41
Personal loans	207		—		207
Other	47		—		47
Total interest income	2,338		—		2,338
Interest expense	400		—		400
Net interest income	1,938		—		1,938
Provision for loan losses	639		1		640
Other income	408		73		481
Other expense	876		36		912
Income before income tax expense	$	831	$	36	$	867
For the Three Months Ended June 30, 2016
Interest income
Credit card loans	$	1,734	$	—	$	1,734
Private student loans	110		—		110
PCI student loans	47		—		47
Personal loans	171		—		171
Other	28		—		28
Total interest income	2,090		—		2,090
Interest expense	339		—		339
Net interest income	1,751		—		1,751
Provision for loan losses	411		1		412
Other income	396		69		465
Other expense	868		38		906
Income before income tax expense	$	868	$	30	$	898

The following table presents segment data (dollars in millions):
	Direct Banking		Payment Services			Total
For the Six Months Ended June 30, 2017
Interest income
Credit card loans	$	3,792	$	—		$	3,792
Private student loans	251		—			251
PCI student loans	82		—			82
Personal loans	405		—			405
Other	86		—			86
Total interest income	4,616		—			4,616
Interest expense	786		—			786
Net interest income	3,830		—			3,830
Provision for loan losses	1,233		(7		)	1,226
Other income	783		145			928
Other expense	1,725		72			1,797
Income before income tax expense	$	1,655	$	80		$	1,735
For the Six Months Ended June 30, 2016
Interest income
Credit card loans	$	3,467	$	—		$	3,467
Private student loans	217		—			217
PCI student loans	96		—			96
Personal loans	338		—			338
Other	56		—			56
Total interest income	4,174		—			4,174
Interest expense	673		—			673
Net interest income	3,501		—			3,501
Provision for loan losses	834		2			836
Other income	802		137			939
Other expense	1,719		73			1,792
Income before income tax expense	$	1,750	$	62		$	1,812

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Investments Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investment Holdings [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 0	$ 0	$ 0	$ 0
Amortization Method Qualified Affordable Housing Project Investments	290		290		$ 270
Qualified Affordable Housing Project Investments, Commitment	74		74		64
Other Assets [Member] | Community Reinvestment Act [Member]
Investment Holdings [Line Items]
Equity Method Investments	332		332		326
Other Liabilities [Member] | Community Reinvestment Act [Member]
Investment Holdings [Line Items]
Loss Contingency Accrual	$ 74		$ 74		$ 64

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Investments (Schedule of Investment Securities) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Investment securities		$ 1,679	$ 1,757
U.S. Treasury Securities [Member]
Investment Holdings [Line Items]
Investment securities	[1]	672	674
Derivative collateral		37	73
States and Political Subdivisions of States [Member]
Investment Holdings [Line Items]
Investment securities		1	2
Residential Mortgage-Backed Securities - Agency [Member]
Investment Holdings [Line Items]
Investment securities	[2]	$ 1,006	$ 1,081

[1] Includes $37 million and $73 million of U.S. Treasury securities pledged as swap collateral as of June 30, 2017 and December 31, 2016, respectively.

[2] Consists of residential mortgage-backed securities issued by Fannie Mae, Freddie Mac and Ginnie Mae.

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Investments (Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Available-for-sale investment securities, amortized cost	[1]	$ 1,503	$ 1,610
Available-for-sale investment securities, gross unrealized gains	[1]	3	2
Available-for-sale investment securities, gross unrealized losses	[1]	(7)	(7)
Available-for-sale investment securities, fair value	[1]	1,499	1,605
Held-to-maturity investment securities, amortized cost	[2]	180	152
Held-to-maturity investment securities, gross unrealized gains	[2]	1	1
Held-to-maturity investment securities, gross unrealized losses	[2]	(1)	(1)
Held-to-maturity investment securities, fair value	[2]	180	152
U.S. Treasury Securities [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, amortized cost	[1]	676	676
Available-for-sale investment securities, gross unrealized gains	[1]	0	0
Available-for-sale investment securities, gross unrealized losses	[1]	(4)	(2)
Available-for-sale investment securities, fair value	[1]	672	674
Residential Mortgage-Backed Securities - Agency [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, amortized cost	[1]	827	934
Available-for-sale investment securities, gross unrealized gains	[1]	3	2
Available-for-sale investment securities, gross unrealized losses	[1]	(3)	(5)
Available-for-sale investment securities, fair value	[1]	827	931
Held-to-maturity investment securities, amortized cost	[2],[3]	179	150
Held-to-maturity investment securities, gross unrealized gains	[2],[3]	1	1
Held-to-maturity investment securities, gross unrealized losses	[2],[3]	(1)	(1)
Held-to-maturity investment securities, fair value	[2],[3]	179	150
States and Political Subdivisions of States [Member]
Investment Holdings [Line Items]
Held-to-maturity investment securities, amortized cost	[2]	1	2
Held-to-maturity investment securities, gross unrealized gains	[2]	0	0
Held-to-maturity investment securities, gross unrealized losses	[2]	0	0
Held-to-maturity investment securities, fair value	[2]	$ 1	$ 2

[1] Available-for-sale investment securities are reported at fair value.

[2] Held-to-maturity investment securities are reported at amortized cost.

[3] Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.

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Investments (Schedule of Fair Value of Securities in a Continuous Unrealized Loss Position for Less Than 12 Months and More Than 12 Months) (Details) $ in Millions	Jun. 30, 2017 USD ($) securities	Dec. 31, 2016 USD ($) securities
U.S. Treasury Securities [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, number of securities in a loss position (in securities) | securities	1	1
Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, fair value	$ 672	$ 674
Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, unrealized losses	(4)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Residential Mortgage-Backed Securities - Agency [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, number of securities in a loss position (in securities) | securities	15	19
Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, fair value	$ 376	$ 586
Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, unrealized losses	(2)	(5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	46	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1)	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities	38	31
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 88	$ 61
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)	(1)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0

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Investments (Schedule of Proceeds, Recognized Gains and Losses and Net Unrealized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Net unrealized gain recorded in other comprehensive income, before-tax	$ 0	$ 6	$ 2	$ 29
Net unrealized gain recorded in other comprehensive income, after-tax	$ 0	$ 4	$ 1	$ 18

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Investments (Schedule of Maturities of Available-for-Sale Debt Securities and Held-to-Maturity Debt Securities) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Available-for-sale investment securities, debt maturities, one year or less, amortized cost		$ 0
Available-for-sale investment securities, debt maturities, after one year through five years, amortized cost		749
Available-for-sale investment securities, debt maturities, after five years through ten years, amortized cost		560
Available-for-sale investment securities, debt maturities, after ten years, amortized cost		194
Available-for-sale investment securities, amortized cost	[1]	1,503	$ 1,610
Held-to-maturity investment securities, debt maturities, one year or less, amortized cost		0
Held-to-maturity investment securities, debt maturities, after one year through five years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after ten years, amortized cost		180
Held-to-maturity investment securities, amortized cost	[2]	180	152
Available-for-sale investment securities, debt maturities, one year or less, fair value		0
Available-for-sale investment securities, debt maturities, after one year through five years, fair value		745
Available-for-sale investment securities, debt maturities, after five years through ten years, fair value		559
Available-for-sale investment securities, debt maturities, after ten years, fair value		195
Available-for-sale investment securities, fair value	[1]	1,499	1,605
Held-to-maturity investment securities, debt maturities, one year or less, fair value		0
Held-to-maturity investment securities, debt maturities, after one year through five years, fair value		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, fair value		0
Held-to-maturity investment securities, debt maturities, after ten years, fair value		180
Held-to-maturity investment securities, fair value	[2]	180	152
U.S. Treasury Securities [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, debt maturities, one year or less, amortized cost		0
Available-for-sale investment securities, debt maturities, after one year through five years, amortized cost		676
Available-for-sale investment securities, debt maturities, after five years through ten years, amortized cost		0
Available-for-sale investment securities, debt maturities, after ten years, amortized cost		0
Available-for-sale investment securities, amortized cost	[1]	676	676
Available-for-sale investment securities, debt maturities, one year or less, fair value		0
Available-for-sale investment securities, debt maturities, after one year through five years, fair value		672
Available-for-sale investment securities, debt maturities, after five years through ten years, fair value		0
Available-for-sale investment securities, debt maturities, after ten years, fair value		0
Available-for-sale investment securities, fair value	[1]	672	674
Residential Mortgage-Backed Securities - Agency [Member]
Investment Holdings [Line Items]
Available-for-sale investment securities, debt maturities, one year or less, amortized cost		0
Available-for-sale investment securities, debt maturities, after one year through five years, amortized cost		73
Available-for-sale investment securities, debt maturities, after five years through ten years, amortized cost		560
Available-for-sale investment securities, debt maturities, after ten years, amortized cost		194
Available-for-sale investment securities, amortized cost	[1]	827	934
Held-to-maturity investment securities, debt maturities, one year or less, amortized cost		0
Held-to-maturity investment securities, debt maturities, after one year through five years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after ten years, amortized cost		179
Held-to-maturity investment securities, amortized cost	[2],[3]	179	150
Available-for-sale investment securities, debt maturities, one year or less, fair value		0
Available-for-sale investment securities, debt maturities, after one year through five years, fair value		73
Available-for-sale investment securities, debt maturities, after five years through ten years, fair value		559
Available-for-sale investment securities, debt maturities, after ten years, fair value		195
Available-for-sale investment securities, fair value	[1]	827	931
Held-to-maturity investment securities, debt maturities, one year or less, fair value		0
Held-to-maturity investment securities, debt maturities, after one year through five years, fair value		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, fair value		0
Held-to-maturity investment securities, debt maturities, after ten years, fair value		179
Held-to-maturity investment securities, fair value	[2],[3]	179	150
States and Political Subdivisions of States [Member]
Investment Holdings [Line Items]
Held-to-maturity investment securities, debt maturities, one year or less, amortized cost		0
Held-to-maturity investment securities, debt maturities, after one year through five years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, amortized cost		0
Held-to-maturity investment securities, debt maturities, after ten years, amortized cost		1
Held-to-maturity investment securities, amortized cost	[2]	1	2
Held-to-maturity investment securities, debt maturities, one year or less, fair value		0
Held-to-maturity investment securities, debt maturities, after one year through five years, fair value		0
Held-to-maturity investment securities, debt maturities, after five years through ten years, fair value		0
Held-to-maturity investment securities, debt maturities, after ten years, fair value		1
Held-to-maturity investment securities, fair value	[2]	$ 1	$ 2

[1] Available-for-sale investment securities are reported at fair value.

[2] Held-to-maturity investment securities are reported at amortized cost.

[3] Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.

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Loan Receivables (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments (in segments) | segment				3
Private student loan forbearance lifetime cap (in months)		12 months
Private student loans including PCI in forbearance		$ 28		$ 28		$ 19
Private student loans in forbearance as a percentage of student loans in repayment and forbearance (in percent)		0.50%		0.50%		0.30%
Percentage of defaulted loans that were charged off at the end of the month in which they defaulted (in percent)		39.00%	34.00%	39.00%	35.00%
Provision for loan losses		$ 640	$ 412	$ 1,226	$ 836
Allowance for loan losses		$ 2,384	$ 1,949	$ 2,384	$ 1,949	$ 2,167	$ 2,264	$ 1,921	$ 1,869
Net charge-off rate (in percent)	[1]	2.71%	2.18%	2.65%	2.15%
Personal Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum period of payment reduction for the temporary reduced payment program (in months)				12 months
Maximum repayment term for temporary modification programs (in years)				9 years
Maximum repayment term for permanent modification programs (in years)				9 years
Credit Card Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum period of payment reduction for the temporary reduced payment program (in months)				12 months
Permanent workout program maturity (in months)				60 months
Interest and fees forgiven due to credit card loan modification program		$ 10	$ 7	$ 21	$ 16
Provision for loan losses		533	347	1,057	709
Allowance for loan losses		$ 1,980	$ 1,603	$ 1,980	$ 1,603	1,790	$ 1,892	$ 1,590	$ 1,554
Net charge-off rate (in percent)	[1]	2.94%	2.39%	2.89%	2.37%
PCI Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit-impaired loans outstanding balance		$ 2,400		$ 2,400		2,700
Purchased credit-impaired loans	[2]	2,322		2,322		2,584
Provision for loan losses		0	$ 0	0	$ 0
Allowance for loan losses		$ 33		$ 33		$ 35
Threshold charge-off period for past due accounts (in days)				120 days
Net charge-off rate (in percent)		0.64%	0.48%	0.58%	0.46%
PCI Student Loans [Member] | 30 or More Days Delinquent [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency rate (in percent)				2.70%		2.88%
PCI Student Loans [Member] | 90 or More Days Delinquent [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency rate (in percent)				0.85%		0.87%

[1] Net charge-off rate represents net charge-off dollars (annualized) divided by average loans for the reporting period.

[2] Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

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Loan Receivables (Schedule of Loan Receivables) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		$ 77,997		$ 77,254
Allowance for loan losses		(2,384)	$ (2,264)	(2,167)	$ (1,949)	$ (1,921)	$ (1,869)
Net loan receivables		75,613		75,087
Variable Interest Entity, Primary Beneficiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		31,356		33,016
Allowance for loan losses		(995)		(955)
Credit Card Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card loans	[1]	30,107		31,626
Allowance for loan losses	[1]	(970)		(928)
Sellers' interest		8,894		10,812
Student Loan Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit-impaired loans	[2]	1,249		1,390
Allowance for loan losses	[2]	(25)		(27)
Credit Card Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card loans	[3]	61,797		61,522
Allowance for loan losses		(1,980)	(1,892)	(1,790)	(1,603)	(1,590)	(1,554)
Credit Card Loans [Member] | Credit Card Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investors' interest		21,200		20,800
Total Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		13,878		13,148
Total Other Loans [Member] | Personal Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		6,955		6,481
Allowance for loan losses		(235)	(207)	(200)	(176)	(165)	(155)
Total Other Loans [Member] | Private Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		6,594		6,393
Total Other Loans [Member] | Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		329		274
Allowance for loan losses		(10)	$ (9)	(19)	$ (19)	$ (18)	$ (17)
Purchase Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit-impaired loans	[4]	2,322		2,584
Allowance for loan losses		(33)		(35)
Purchase Credit-Impaired Loans [Member] | Student Loan Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		$ 1,200		$ 1,400

[1] The Company maintains its allowance for loan losses at an amount sufficient to absorb probable losses inherent in all loan receivables, which includes all loan receivables in the trusts. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company’s balance sheet in accordance with GAAP.

[2] The Company maintains its allowance for loan losses on PCI loans sufficient to absorb probable decreases in cash flows that were previously expected. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company's balance sheet in accordance with GAAP.

[3] Amounts include $21.2 billion and $20.8 billion underlying investors’ interest in trust debt at June 30, 2017 and December 31, 2016, respectively, and $8.9 billion and $10.8 billion in seller's interest at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

[4] Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

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Loan Receivables (Schedule of Delinquent and Non-Accruing Loans) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		$ 1,457		$ 1,457		$ 1,469
Loan receivables, 90 or more days delinquent and accruing		602		602		597
Loan receivables, total non-accruing		226		226		216
30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		790		790		817
90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		667		667		652
Credit Card Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		1,237		1,237		1,252
Loan receivables, 90 or more days delinquent and accruing	[1]	540		540		544
Loan receivables, total non-accruing	[2]	206		206		189
Estimated gross interest income that would have been recorded based on original terms		9	$ 7	17	$ 15
Credit Card Loans [Member] | 30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		634		634		655
Credit Card Loans [Member] | 90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		603		603		597
Total Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		220		220		217
Loan receivables, 90 or more days delinquent and accruing		62		62		53
Loan receivables, total non-accruing		20		20		27
Total Other Loans [Member] | 30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		156		156		162
Total Other Loans [Member] | 90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		64		64		55
Total Other Loans [Member] | Personal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		78		78		74
Loan receivables, 90 or more days delinquent and accruing	[3]	20		20		18
Loan receivables, total non-accruing		10		10		8
Total Other Loans [Member] | Personal Loans [Member] | 30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		57		57		55
Total Other Loans [Member] | Personal Loans [Member] | 90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		21		21		19
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		140		140		141
Loan receivables, 90 or more days delinquent and accruing	[4]	42		42		35
Loan receivables, total non-accruing		0		0		0
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member] | 30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		98		98		106
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member] | 90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		42		42		35
Total Other Loans [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		2		2		2
Loan receivables, 90 or more days delinquent and accruing		0		0		0
Loan receivables, total non-accruing		10		10		19
Total Other Loans [Member] | Other Loans [Member] | 30-89 Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		1		1		1
Total Other Loans [Member] | Other Loans [Member] | 90 or More Days Delinquent [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, past due		1		1		1
Entity Loan Modification Program [Member] | Credit Card Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, 90 or more days delinquent and accruing		61		61		58
Entity Loan Modification Program [Member] | Total Other Loans [Member] | Personal Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, 90 or more days delinquent and accruing		3		3		2
Entity Loan Modification Program [Member] | Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan receivables, 90 or more days delinquent and accruing		$ 5		$ 5		$ 3

[1] Credit card loans that are 90 or more days delinquent and accruing interest include $61 million and $58 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

[2] The Company estimates that the gross interest income that would have been recorded in accordance with the original terms of non-accruing credit card loans was $9 million and $7 million for the three months ended June 30, 2017 and 2016, respectively, and $17 million and $15 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not separately track the amount of gross interest income that would have been recorded in accordance with the original terms of loans. This amount was estimated based on customers' current balances and most recent interest rates.

[3] Personal loans that are 90 or more days delinquent and accruing interest include $3 million and $2 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016, respectively.

[4] Private student loans that are 90 or more days delinquent and accruing interest include $5 million and $3 million of loans accounted for as troubled debt restructurings at June 30, 2017 and December 31, 2016.

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Loan Receivables (Schedule of Net Charge-offs) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Charge Offs [Line Items]
Net charge-offs		$ 520	$ 384	$ 1,009	$ 756
Net charge-off rate (in percent)	[1]	2.71%	2.18%	2.65%	2.15%
Excluding PCI Loans [Member]
Charge Offs [Line Items]
Net charge-offs		$ 520	$ 384	$ 1,009	$ 756
Net charge-off rate (in percent)	[1]	2.79%	2.27%	2.74%	2.24%
Credit Card Loans [Member]
Charge Offs [Line Items]
Net charge-offs		$ 445	$ 334	$ 867	$ 660
Net charge-off rate (in percent)	[1]	2.94%	2.39%	2.89%	2.37%
Total Other Loans [Member]
Charge Offs [Line Items]
Net charge-offs		$ 75	$ 50	$ 142	$ 96
Net charge-off rate (in percent)	[1]	2.14%	1.68%	2.08%	1.64%
Total Other Loans [Member] | Personal Loans [Member]
Charge Offs [Line Items]
Net charge-offs		$ 54	$ 33	$ 105	$ 67
Net charge-off rate (in percent)	[1]	3.18%	2.38%	3.17%	2.41%
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member]
Charge Offs [Line Items]
Net charge-offs		$ 20	$ 17	$ 34	$ 29
Net charge-off rate (in percent)	[1]	1.15%	1.10%	0.99%	0.98%
Total Other Loans [Member] | Other Loans [Member]
Charge Offs [Line Items]
Net charge-offs		$ 1	$ 0	$ 3	$ 0
Net charge-off rate (in percent)	[1]	0.30%	0.00%	1.79%	0.00%

[1] Net charge-off rate represents net charge-off dollars (annualized) divided by average loans for the reporting period.

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Loan Receivables (Schedule of Credit Risk Profile by FICO Score) (Details)		Jun. 30, 2017	Dec. 31, 2016
Credit Card Loans [Member] | FICO Score, 660 and Above [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables		82.00%	82.00%
Credit Card Loans [Member] | FICO Score, Less Than 660 Or No Score [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables		18.00%	18.00%
Total Other Loans [Member] | Personal Loans [Member] | FICO Score, 660 and Above [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables		96.00%	96.00%
Total Other Loans [Member] | Personal Loans [Member] | FICO Score, Less Than 660 Or No Score [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables		4.00%	4.00%
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member] | FICO Score, 660 and Above [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables	[1]	96.00%	95.00%
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member] | FICO Score, Less Than 660 Or No Score [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
FICO scores as a percentage of class of loan receivables	[1]	4.00%	5.00%

[1] PCI loans are discussed under the heading "— Purchased Credit-Impaired Loans."

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Loan Receivables (Schedule of Changes in the Allowance for Loan Losses) (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 2,264		$ 1,921	$ 2,167		$ 1,869
Provision for loan losses		640		412	1,226		836
Charge-offs		(645)		(505)	(1,256)		(998)
Recoveries		125		121	247		242
Net charge-offs		(520)		(384)	(1,009)		(756)
Balance at end of period		2,384		1,949	2,384		1,949
Student Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	[1]	156		148	158	[2]	143
Provision for loan losses	[1]	23		20	35		37
Charge-offs	[1]	(22)		(19)	(39)		(34)
Recoveries	[1]	2		2	5		5
Net charge-offs	[1]	(20)		(17)	(34)		(29)
Balance at end of period	[1]	159	[2]	151	159	[2]	151
Credit Card Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		1,892		1,590	1,790		1,554
Provision for loan losses		533		347	1,057		709
Charge-offs		(561)		(448)	(1,096)		(887)
Recoveries		116		114	229		227
Net charge-offs		(445)		(334)	(867)		(660)
Balance at end of period		1,980		1,603	1,980		1,603
Total Other Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Net charge-offs		(75)		(50)	(142)		(96)
Total Other Loans [Member] | Personal Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		207		165	200		155
Provision for loan losses		82		44	140		88
Charge-offs		(61)		(38)	(118)		(77)
Recoveries		7		5	13		10
Net charge-offs		(54)		(33)	(105)		(67)
Balance at end of period		235		176	235		176
Total Other Loans [Member] | Other Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		9		18	19		17
Provision for loan losses		2		1	(6)		2
Charge-offs		(1)		0	(3)		0
Recoveries		0		0	0		0
Net charge-offs		(1)		0	(3)		0
Balance at end of period		$ 10		$ 19	$ 10		$ 19

[1] Includes both PCI and non-PCI private student loans.

[2] Includes both PCI and non-PCI private student loans.

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Loan Receivables (Schedule of Net Charge-offs of Interest and Fee Revenues on Loan Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loans and Leases Receivable Disclosure [Abstract]
Interest and fees accrued subsequently charged off, net of recoveries (recorded as a reduction of interest income)	$ 87	$ 67	$ 171	$ 136
Fees accrued subsequently charged off, net of recoveries (recorded as a reduction to other income)	$ 23	$ 17	$ 45	$ 34

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Loan Receivables (Schedule of Allowance for Loan Losses and Recorded Investment in its Loan Portfolio by Impairment Methodology) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, collectively evaluated for impairment in accordance with ASC 450-20		$ 2,108			$ 1,910
Allowance for loan losses, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	243			222
Total allowance for loan losses		2,384		$ 2,264	2,167		$ 1,949	$ 1,921	$ 1,869
Recorded investment in loans, collectively evaluated for impairment in accordance with ASC 450-20		74,274			73,363
Recorded investment in loans, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	1,401			1,307
Loan receivables		77,997			77,254
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loans losses, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		33			35
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		2,322			2,584
Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses	[4]	159	[3]	156	158	[3]	151	148	143
Total recorded investment	[3]	8,916			8,977
Credit Card Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, collectively evaluated for impairment in accordance with ASC 450-20		1,789			1,623
Allowance for loan losses, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	191			167
Total allowance for loan losses		1,980		1,892	1,790		1,603	1,590	1,554
Recorded investment in loans, collectively evaluated for impairment in accordance with ASC 450-20		60,649			60,437
Recorded investment in loans, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	1,148			1,085
Total recorded investment		61,797			61,522
Unpaid principal balance of modified loans accounted for as troubled debt restructurings		994			935
Credit Card Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loans losses, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
Total Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables		13,878			13,148
Total Other Loans [Member] | Personal Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, collectively evaluated for impairment in accordance with ASC 450-20		210			179
Allowance for loan losses, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	25			21
Total allowance for loan losses		235		207	200		176	165	155
Recorded investment in loans, collectively evaluated for impairment in accordance with ASC 450-20		6,863			6,400
Recorded investment in loans, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	92			81
Total recorded investment		6,955			6,481
Loan receivables		6,955			6,481
Unpaid principal balance of modified loans accounted for as troubled debt restructurings		91			79
Total Other Loans [Member] | Personal Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loans losses, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, collectively evaluated for impairment in accordance with ASC 450-20		106			105
Allowance for loan losses, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	20			18
Recorded investment in loans, collectively evaluated for impairment in accordance with ASC 450-20		6,479			6,307
Recorded investment in loans, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	115			86
Loan receivables		6,594			6,393
Unpaid principal balance of modified loans accounted for as troubled debt restructurings		113			84
Total Other Loans [Member] | Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, collectively evaluated for impairment in accordance with ASC 450-20		3			3
Allowance for loan losses, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	7			16
Total allowance for loan losses		10		$ 9	19		$ 19	$ 18	$ 17
Recorded investment in loans, collectively evaluated for impairment in accordance with ASC 450-20		283			219
Recorded investment in loans, evaluated for impairment in accordance with ASC 310-10-35	[1],[2]	46			55
Total recorded investment		329			274
Loan receivables		329			274
Total Other Loans [Member] | Other Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loans losses, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		0			0
PCI Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowance for loan losses		33			35
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30	[5]	2,322			2,584
PCI Student Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loans losses, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		33			35
Recorded investment in loans, acquired with deteriorated credit quality, evaluated in accordance with ASC 310-30		$ 2,322			$ 2,584

[1] Loan receivables evaluated for impairment in accordance with Accounting Standards Codification ("ASC") 310-10-35 include credit card loans, personal loans and student loans collectively evaluated for impairment in accordance with ASC Subtopic 310-40, Receivables, which consists of modified loans accounted for as troubled debt restructurings. Other loans are individually evaluated for impairment and generally do not represent troubled debt restructurings.

[2] The unpaid principal balance of credit card loans was $994 million and $935 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of personal loans was $91 million and $79 million at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of student loans was $113 million and $84 million at June 30, 2017 and December 31, 2016, respectively. All loans accounted for as troubled debt restructurings have a related allowance for loan losses.

[3] Includes both PCI and non-PCI private student loans.

[4] Includes both PCI and non-PCI private student loans.

[5] Amounts include $1.2 billion and $1.4 billion of loans pledged as collateral against the notes issued from the Student Loan Corporation ("SLC") securitization trusts at June 30, 2017 and December 31, 2016, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

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Loan Receivables (Schedule of Troubled Debt Restructurings) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Credit Card Loans [Member]
Financing Receivable, Modifications [Line Items]
Average recorded investment in loans	[1]	$ 1,137	$ 1,016	$ 1,122	$ 1,019
Interest income recognized during period loans were impaired	[1],[2]	25	22	50	42
Gross interest income that would have been recorded with original terms	[1],[3]	22	19	42	39
Total Other Loans [Member] | Personal Loans [Member]
Financing Receivable, Modifications [Line Items]
Average recorded investment in loans		90	71	87	70
Interest income recognized during period loans were impaired	[2]	3	2	5	4
Gross interest income that would have been recorded with original terms	[3]	1	0	2	1
Total Other Loans [Member] | Private Student Loans [Member]
Financing Receivable, Modifications [Line Items]
Average recorded investment in loans		107	53	101	52
Interest income recognized during period loans were impaired	[2]	1	1	3	2
Gross interest income that would have been recorded with original terms	[3],[4]	0		0
Modified credit card loans | Credit Card Loans [Member]
Financing Receivable, Modifications [Line Items]
Average recorded investment in loans		$ 324	$ 274	$ 317	$ 274

[1] Includes credit card loans that were modified in troubled debt restructurings, but are no longer enrolled in a troubled debt restructuring program due to noncompliance with the terms of the modification or successful completion of a program. The average balance of credit card loans that were no longer enrolled in a troubled debt restructuring program was $324 million and $274 million, respectively, for the three months ended June 30, 2017 and 2016, and $317 million and $274 million for the six months ended June 30, 2017 and 2016.

[2] The Company does not separately track interest income on loans in modification programs. Amounts shown are estimated by applying an average interest rate to the average loans in the various modification programs.

[3] The Company does not separately track the amount of additional gross interest income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. Amounts shown are estimated by applying the difference between the average interest rate earned on non-impaired loans and the average interest rate earned on loans in the modification programs to the average loans in the modification programs.

[4] As a result of the updates implemented in the third quarter of 2016, some student loans accounted for as troubled debt restructurings have additional gross income that would have been recorded if the loans in modification programs had not been restructured and interest had instead been recorded in accordance with the original terms. For the three and six months ended June 30, 2017, the gross income that would have been recorded with original terms for student loans in modification programs was not material.

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Loan Receivables (Schedule of Loans That Entered a Modification Program During the Period) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) accounts	Jun. 30, 2016 USD ($) accounts	Jun. 30, 2017 USD ($) accounts	Jun. 30, 2016 USD ($) accounts
Credit Card Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts	26,078	19,780	56,971	42,064
Accounts that entered a loan modification program during the period, balances | $	$ 157	$ 118	$ 338	$ 253
Total Other Loans [Member] | Personal Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts	1,430	1,027	2,993	2,088
Accounts that entered a loan modification program during the period, balances | $	$ 18	$ 12	$ 36	$ 24
Total Other Loans [Member] | Private Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts	1,003	289	2,020	741
Accounts that entered a loan modification program during the period, balances | $	$ 18	$ 4	$ 35	$ 12

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Loan Receivables (Schedule of Troubled Debt Restructurings That Subsequently Defaulted) (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017 USD ($) accounts	Jun. 30, 2016 USD ($) accounts	Jun. 30, 2017 USD ($) accounts missed_payments	Jun. 30, 2016 USD ($) accounts
Financing Receivable, Modifications [Line Items]
Amount of missed payments after which a customer defaults from a modification program (in payments) | missed_payments				2
Credit Card Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings that subsequently defaulted, number of accounts (in accounts) | accounts	[1],[2]	8,049	4,380	16,215	9,080
Troubled debt restructurings that subsequently defaulted, aggregated outstanding balances upon default | $	[1],[2]	$ 43	$ 23	$ 87	$ 48
Total Other Loans [Member] | Personal Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings that subsequently defaulted, number of accounts (in accounts) | accounts	[1]	341	276	648	434
Troubled debt restructurings that subsequently defaulted, aggregated outstanding balances upon default | $	[1]	$ 4	$ 3	$ 8	$ 5
Total Other Loans [Member] | Private Student Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings that subsequently defaulted, number of accounts (in accounts) | accounts	[3]	184	177	369	374
Troubled debt restructurings that subsequently defaulted, aggregated outstanding balances upon default | $	[3]	$ 3	$ 3	$ 6	$ 6
Delinquency days to default (in days)				60 days

[1] For credit card loans and personal loans, a customer defaults from a modification program after two consecutive missed payments. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

[2] Terms revert back to the pre-modification terms for customers who default from a temporary program and charging privileges remain revoked in most cases.

[3] For student loans, defaults have been defined as loans that are 60 or more days delinquent. The outstanding balance upon default is generally the loan balance at the end of the month prior to default.

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Loan Receivables (Schedule of Changes in Accretable Yield for the Acquired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, balance at beginning of period	$ 755	$ 916	$ 796	$ 965
Accretion into interest income	(40)	(47)	(81)	(96)
Other changes in expected cash flows	10	19	10	19
Accretable yield, balance at end of period	$ 725	$ 888	$ 725	$ 888

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Credit Card and Student Loan Securitization Activities (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 classes trusts
Student Loan Securitization Trusts [Member]
Variable Interest Entity [Line Items]
Number of trusts issuing securities (in trusts) | trusts	3
Discover Card Execution Note Trust [Member] | Credit Card Securitization Trusts [Member]
Variable Interest Entity [Line Items]
Number of classes of securities in debt structure (in classes) | classes	4

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Credit Card and Student Loan Securitization Activities (Schedule of Restricted Credit Card Securitized Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Restricted cash		$ 93		$ 95
Allowance for loan losses allocated to securitized loan receivables		(2,384)	$ (2,264)	(2,167)	$ (1,949)	$ (1,921)	$ (1,869)
Other		2,229		2,300
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash		93		95
Allowance for loan losses allocated to securitized loan receivables		(995)		(955)
Other		5		4
Variable Interest Entity, Primary Beneficiary [Member] | Credit Card Securitization Trusts [Member]
Variable Interest Entity [Line Items]
Restricted cash		26		23
Investors’ interests held by third-party investors		16,100		15,625
Investors’ interests held by wholly-owned subsidiaries of Discover Bank		5,113		5,189
Seller’s interest		8,894		10,812
Loan receivables	[1]	30,107		31,626
Allowance for loan losses allocated to securitized loan receivables	[1]	(970)		(928)
Net loan receivables		29,137		30,698
Other		5		4
Carrying value of assets of consolidated variable interest entities		$ 29,168		$ 30,725

[1] The Company maintains its allowance for loan losses at an amount sufficient to absorb probable losses inherent in all loan receivables, which includes all loan receivables in the trusts. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company’s balance sheet in accordance with GAAP.

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Credit Card and Student Loan Securitization Activities (Schedule of Restricted Student Loan Securitized Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Restricted cash		$ 93		$ 95
Allowance for loan losses allocated to securitized loan receivables		(2,384)	$ (2,264)	(2,167)	$ (1,949)	$ (1,921)	$ (1,869)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash		93		95
Allowance for loan losses allocated to securitized loan receivables		(995)		(955)
Variable Interest Entity, Primary Beneficiary [Member] | Student Loan Securitization Trusts [Member]
Variable Interest Entity [Line Items]
Restricted cash		67		72
Purchased credit-impaired loans	[1]	1,249		1,390
Allowance for loan losses allocated to securitized loan receivables	[1]	(25)		(27)
Net student loan receivables		1,224		1,363
Carrying value of assets of consolidated variable interest entities		$ 1,291		$ 1,435

[1] The Company maintains its allowance for loan losses on PCI loans sufficient to absorb probable decreases in cash flows that were previously expected. Therefore, credit risk associated with the transferred receivables is fully reflected on the Company's balance sheet in accordance with GAAP.

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Deposits (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 channels
Deposits [Abstract]
Deposits source channels (in number of channels)	2

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Deposits (Schedule of Interest Bearing Deposit Accounts) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Deposits [Abstract]
Certificates of deposit in amounts less than $100,000		$ 19,597	$ 20,225
Certificates of deposit in amounts $100,000 or greater	[1]	5,977	5,864
Savings deposits, including money market deposit accounts		26,785	25,372
Interest-bearing deposit accounts		52,359	51,461
Certificates of deposit greater than $250,000		$ 1,400	$ 1,400

[1] Includes $1.4 billion in certificates of deposit greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of June 30, 2017 and December 31, 2016.

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Deposits (Schedule of $100,000 or More Certificates of Deposit Maturities) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Deposits [Abstract]
Three months or less		$ 899
Over three months through six months		811
Over six months through twelve months		1,574
Over twelve months		2,693
Total	[1]	$ 5,977	$ 5,864

[1] Includes $1.4 billion in certificates of deposit greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of June 30, 2017 and December 31, 2016.

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Deposits (Schedule of Certificates of Deposit Maturities) (Details) $ in Millions	Jun. 30, 2017 USD ($)
Deposits [Abstract]
2017	$ 5,966
2018	8,193
2019	3,435
2020	2,671
2021	1,879
Thereafter	3,430
Total	$ 25,574

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Long-Term Borrowings (Narrative) (Details) - Discover Card Master Trust I and Discover Card Execution Note Trust [Member] - Secured Debt [Member] $ in Millions	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Total commitment of secured credit facilities	$ 6,000
Total used commitment of secured credit facilities	$ 0

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Long-Term Borrowings (Schedule of Long-Term Borrowings and Weighted Average Interest Rates) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017		Dec. 31, 2016
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		$ 26,438		$ 25,443
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		16,738		16,411
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		$ 16,030		15,562
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Fixed-Rate Asset-Backed Securities [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		2.17%
Long-term borrowings (in dollars)	[1]	$ 9,818		9,868
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Fixed-Rate Asset-Backed Securities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		1.39%
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Fixed-Rate Asset-Backed Securities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		5.65%
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating-Rate Asset-Backed Securities [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		1.60%
Long-term borrowings (in dollars)	[3]	$ 6,212	[2]	5,694
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating-Rate Asset-Backed Securities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		1.39%
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating-Rate Asset-Backed Securities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		1.83%
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member]
Debt Instrument [Line Items]
Interest rate terms		1-month LIBOR + 23 to 60 basis points
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.23%
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.60%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		$ 708		849
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating-Rate Asset-Backed Securities [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		2.81%
Long-term borrowings (in dollars)	[5],[7]	$ 708	[4],[6]	849
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating-Rate Asset-Backed Securities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		1.33%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating-Rate Asset-Backed Securities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		5.00%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member]
Debt Instrument [Line Items]
Interest rate terms		3-month LIBOR + 17 to 45 basis points
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.17%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.45%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member]
Debt Instrument [Line Items]
Interest rate terms		Prime rate + 75 to 100 basis points
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus 350 Basis Points [Member]
Debt Instrument [Line Items]
Interest rate terms		1-month LIBOR + 350 basis points
Basis spread on variable rate		3.50%
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior Notes Maturing 2031 [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		$ 255
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior and Subordinated Notes Maturing 2036 [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		436
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior Notes Maturing 2042 [Member]
Debt Instrument [Line Items]
Long-term borrowings (in dollars)		$ 17
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Senior Notes [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		4.25%
Long-term borrowings (in dollars)	[1]	$ 2,695		2,090
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		3.75%
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		10.25%
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Retail Notes [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		3.70%
Long-term borrowings (in dollars)		$ 227		169
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Retail Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		2.85%
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Retail Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		4.40%
Senior Notes [Member] | Discover Bank [Member] | Fixed-Rate Senior Bank Notes [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		3.21%
Long-term borrowings (in dollars)	[1]	$ 6,081		6,077
Senior Notes [Member] | Discover Bank [Member] | Fixed-Rate Senior Bank Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		2.00%
Senior Notes [Member] | Discover Bank [Member] | Fixed-Rate Senior Bank Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		4.25%
Subordinated Debt [Member] | Discover Bank [Member] | Fixed-Rate Subordinated Bank Notes [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		7.49%
Long-term borrowings (in dollars)		$ 697		$ 696
Subordinated Debt [Member] | Discover Bank [Member] | Fixed-Rate Subordinated Bank Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate		7.00%
Subordinated Debt [Member] | Discover Bank [Member] | Fixed-Rate Subordinated Bank Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate		8.70%

[1] The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in London Interbank Offered Rate (“LIBOR”). Use of these interest rate swaps impacts carrying value of the debt.

[2] Discover Card Execution Note Trust floating-rate asset-backed securities include issuances with the following interest rate terms: 1-month LIBOR + 23 to 60 basis points as of June 30, 2017.

[3] The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on a portion of these long-term borrowings. There is no impact on debt carrying value from use of these interest rate swaps. See Note 14: Derivatives and Hedging Activities for additional information.

[4] Includes $255 million of senior notes maturing in 2031, $436 million of senior and subordinated notes maturing in 2036 and $17 million of senior notes maturing in 2042 as of June 30, 2017.

[5] Repayment of this debt is dependent upon the timing of principal and interest payments on the underlying student loans. The dates shown represent final maturity dates.

[6] SLC Private Student Loan Trusts floating-rate asset-backed securities include issuances with the following interest rate terms: 3-month LIBOR + 17 to 45 basis points, Prime rate + 75 to 100 basis points and 1-month LIBOR + 350 basis points as of June 30, 2017.

[7] The Company acquired an interest rate swap related to the securitized debt assumed in the SLC transaction which matured and is no longer outstanding as of June 30, 2017. The swap did not qualify for hedge accounting and had no impact on debt carrying value. See Note 14: Derivatives and Hedging Activities for additional information.

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Long-Term Borrowings (Schedule of Long-Term Borrowings Maturities) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
2017	$ 2,201
2018	5,269
2019	5,991
2020	3,433
2021	1,040
Thereafter	8,504
Total	$ 26,438	$ 25,443

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Accumulated Other Comprehensive Income (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period, net of tax	$ (155)	$ (172)	$ (161)	$ (160)
Net change in accumulated other comprehensive income (loss), net of tax	5	(2)	11	(14)
Accumulated other comprehensive income (loss), balance at end of period, net of tax	(150)	(174)	(150)	(174)
Unrealized Gain (Loss) on Available-for-Sale Investment Securities, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period, net of tax	(2)	14	(3)	0
Net change in accumulated other comprehensive income (loss), net of tax	0	4	1	18
Accumulated other comprehensive income (loss), balance at end of period, net of tax	(2)	18	(2)	18
Gain (Loss) on Cash Flow Hedges, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period, net of tax	(8)	(46)	(13)	(20)
Net change in accumulated other comprehensive income (loss), net of tax	5	(6)	10	(32)
Accumulated other comprehensive income (loss), balance at end of period, net of tax	(3)	(52)	(3)	(52)
Pension Plan Loss, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period, net of tax	(145)	(140)	(145)	(140)
Net change in accumulated other comprehensive income (loss), net of tax	0	0	0	0
Accumulated other comprehensive income (loss), balance at end of period, net of tax	$ (145)	$ (140)	$ (145)	$ (140)

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Accumulated Other Comprehensive Income (Schedule of Other Comprehensive Income Before Reclassifications and Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Available-for-sale investment securities, net unrealized holding gain (loss) arising during the period, before tax	$ 0	$ 6	$ 2	$ 29
Available-for-sale investment securities, net unrealized holding gain (loss) arising during the period, tax benefit (expense)	0	(2)	(1)	(11)
Available-for-sale investment securities, net unrealized holding gain (loss) arising during the period, net of tax	0	4	1	18
Available-for-sale investment securities, net change, before tax	0	6	2	29
Available-for-sale investment securities, net change, tax benefit (expense)	0	(2)	(1)	(11)
Available-for-sale investment securities, net change, net of tax	0	4	1	18
Cash flow hedges, net unrealized gain (loss) arising during the period, before tax	3	(18)	9	(70)
Cash flow hedges, net unrealized gain (loss) arising during the period, tax benefit (expense)	(1)	6	(4)	27
Cash flow hedges, net unrealized gain (loss) arising during the period, net of tax	2	(12)	5	(43)
Cash flow hedges, amounts reclassified from AOCI, before tax	3	9	8	18
Cash flow hedges, amounts reclassified from AOCI, tax benefit (expense)	0	(3)	(3)	(7)
Cash flow hedges, amounts reclassified from AOCI, net of tax	3	6	5	11
Cash flow hedges, net change, before tax	6	(9)	17	(52)
Cash flow hedges, net change, tax benefit (expense)	(1)	3	(7)	20
Cash flow hedges, net change, net of tax	$ 5	$ (6)	$ 10	$ (32)

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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Change in income tax expense	$ 39		$ 4
Effective income tax rate (in percent)	37.10%	31.40%	36.00%	34.30%

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Income Taxes (Schedule of Effective Income Tax Rate Calculation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income before income tax expense	$ 867	$ 898	$ 1,735	$ 1,812
Income tax expense	$ 321	$ 282	$ 625	$ 621
Effective income tax rate (in percent)	37.10%	31.40%	36.00%	34.30%

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Earnings Per Share (Schedule of Basic and Diluted EPS ) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income	$ 546	$ 616	$ 1,110	$ 1,191
Preferred stock dividends	(10)	(10)	(19)	(19)
Net income available to common stockholders	536	606	1,091	1,172
Income allocated to participating securities	(4)	(4)	(8)	(8)
Net income allocated to common stockholders	532	602	1,083	1,164
Income allocated to participating securities, diluted	(4)	(4)	(8)	(8)
Net income allocated to common stockholders, diluted	$ 532	$ 602	$ 1,083	$ 1,164
Denominator:
Weighted-average shares of common stock outstanding (in shares)	379	410	382	414
Weighted Average Number Diluted Shares Outstanding Adjustment	0	1	0	0
Weighted-average shares of common stock outstanding and common stock equivalents (in shares)	379	411	382	414
Basic earnings per common share (in dollars per share)	$ 1.41	$ 1.47	$ 2.83	$ 2.81
Diluted earnings per common share (in dollars per share)	$ 1.40	$ 1.47	$ 2.83	$ 2.81

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Capital Adequacy (Narrative) (Details)	Jun. 30, 2017
Regulatory Capital Requirements [Abstract]
Basel III minimum total capital ratio requirement	8.00%
Basel III minimum tier 1 capital ratio requirement	6.00%
Basel III minimum leverage ratio requirement	4.00%
Basel III minimum CET1 ratio requirement	4.50%

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Capital Adequacy (Schedule of Minimum and Well-Capitalized Requirements) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements [Line Items]
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		8.00%
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		6.00%
Tier I capital to average assets, minimum capital requirements, ratio (in percent)		4.00%
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		4.50%
Parent Company [Member]
Compliance with Regulatory Capital Requirements [Line Items]
Total capital to risk-weighted assets, actual amount		$ 12,263	$ 12,445
Total capital to risk-weighted assets, actual ratio (in percent)		15.20%	15.50%
Total capital to risk-weighted assets, minimum capital requirements, amount		$ 6,436	$ 6,408
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		8.00%	8.00%
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount	[1]	$ 8,045	$ 8,010
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent)	[1]	10.00%	10.00%
Tier I capital to risk-weighted assets, actual amount		$ 11,052	$ 11,152
Tier I capital to risk-weighted assets, actual ratio (in percent)		13.70%	13.90%
Tier I capital to risk-weighted assets, minimum capital requirements, amount		$ 4,827	$ 4,806
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		6.00%	6.00%
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount	[1]	$ 4,827	$ 4,806
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent)	[1]	6.00%	6.00%
Tier I capital to average assets, actual amount		$ 11,052	$ 11,152
Tier I capital to average assets, actual ratio (in percent)		11.80%	12.30%
Tier I capital to average assets, minimum capital requirements, amount		$ 3,742	$ 3,624
Tier I capital to average assets, minimum capital requirements, ratio (in percent)		4.00%	4.00%
Parent Company [Member] | Transition [Member]
Compliance with Regulatory Capital Requirements [Line Items]
CET1 capital to risk-weighted assets, actual amount		$ 10,492	$ 10,592
CET1 capital to risk-weighted assets, actual ratio (in percent)		13.00%	13.20%
CET1 capital to risk-weighted assets, minimum capital requirements, amount		$ 3,620	$ 3,604
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		4.50%	4.50%
Discover Bank [Member]
Compliance with Regulatory Capital Requirements [Line Items]
Total capital to risk-weighted assets, actual amount		$ 12,392	$ 12,334
Total capital to risk-weighted assets, actual ratio (in percent)		15.50%	15.50%
Total capital to risk-weighted assets, minimum capital requirements, amount		$ 6,376	$ 6,346
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		8.00%	8.00%
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount		$ 7,970	$ 7,932
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent)		10.00%	10.00%
Tier I capital to risk-weighted assets, actual amount		$ 10,600	$ 10,450
Tier I capital to risk-weighted assets, actual ratio (in percent)		13.30%	13.20%
Tier I capital to risk-weighted assets, minimum capital requirements, amount		$ 4,782	$ 4,759
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		6.00%	6.00%
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount		$ 6,376	$ 6,346
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent)		8.00%	8.00%
Tier I capital to average assets, actual amount		$ 10,600	$ 10,450
Tier I capital to average assets, actual ratio (in percent)		11.40%	11.60%
Tier I capital to average assets, minimum capital requirements, amount		$ 3,710	$ 3,591
Tier I capital to average assets, minimum capital requirements, ratio (in percent)		4.00%	4.00%
Tier I capital to average assets, capital requirements to be classified as well-capitalized, amount		$ 4,637	$ 4,488
Tier I capital to average assets, capital requirements to be classified as well-capitalized, ratio (in percent)		5.00%	5.00%
Discover Bank [Member] | Transition [Member]
Compliance with Regulatory Capital Requirements [Line Items]
CET1 capital to risk-weighted assets, actual amount		$ 10,600	$ 10,450
CET1 capital to risk-weighted assets, actual ratio (in percent)		13.30%	13.20%
CET1 capital to risk-weighted assets, minimum capital requirements, amount		$ 3,587	$ 3,570
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent)		4.50%	4.50%
CET1 capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount		$ 5,181	$ 5,156
CET1 capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent)		6.50%	6.50%

[1] The Basel III rules do not establish well-capitalized thresholds for these measures for bank holding companies. Existing well-capitalized thresholds established in the Federal Reserve's Regulation Y have been included where available.

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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Commitments, Contingencies and Guarantees [Line Items]
Settlement Withholdings And Escrow Deposits	$ 7	$ 9
Commitments to Extend Credit [Member]
Commitments, Contingencies and Guarantees [Line Items]
Unused commitments to extend credit for loans	184,300
Network Alliance [Domain]
Commitments, Contingencies and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	31
Diners Club [Member] | Merchant Guarantee [Member]
Commitments, Contingencies and Guarantees [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 152

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Commitments, Contingencies and Guarantees (Schedule of Lease Commitments) (Details) $ in Millions	Jun. 30, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 6
2018	12
2019	11
2020	10
2021	9
Thereafter	41
Total minimum lease payments	$ 89

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Commitments, Contingencies and Guarantees (Schedule of Merchant Chargeback Guarantee) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Merchant Chargeback Guarantees [Member]
Loss Contingencies [Line Items]
Aggregate sales transaction volume	[1]	$ 35,885	$ 34,634	$ 68,539	$ 65,915

[1] Represents period transactions processed on the Discover Network for which a potential liability exists that, in aggregate, can differ from credit card sales volume.

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Litigation and Regulatory Matters (Narrative) (Details) - USD ($)	Jul. 22, 2015	Jun. 30, 2017	Jul. 09, 2015
Loss Contingencies [Line Items]
TCPA statutory damages for each violation			$ 500
TCPA statutory damages for each willful violation			$ 1,500
Unfavorable Regulatory Action [Member] | CFPB Consent Order [Member]
Loss Contingencies [Line Items]
Amount of civil money penalty for CFPB consent order	$ 2,500,000
Maximum [Member] | Pending and Threatened Litigation [Member]
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses		$ 150,000,000
Minimum [Member] | Unfavorable Regulatory Action [Member] | CFPB Consent Order [Member]
Loss Contingencies [Line Items]
Aggregate range of reasonably possible losses	$ 16,000,000

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Fair Value Measurements and Disclosures (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities, par value	$ 808
Available for sale securities, weighted average coupon rate (in percent)	2.81%
Available for sale securities, weighted average remaining maturity (in years)	3 years
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset transfers from level 1 to level 2 within the fair value hierarchy	$ 0	$ 0
Asset transfers from level 2 to level 1 within the fair value hierarchy	0	0
Liability transfers from level 1 to level 2 within the fair value hierarchy	0	0
Liability transfers from level 2 to level 1 within the fair value hierarchy	$ 0	$ 0

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Fair Value Measurements and Disclosures (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	$ 1,499		$ 1,605
Derivative financial instruments, assets, fair value	5	[1]	7
Derivative financial instruments, liabilities, fair value	13	[1]	94
U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	672		674
Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	827		931
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	672		674
Derivative financial instruments, assets, fair value	0		0
Derivative financial instruments, liabilities, fair value	0		0
Level 1 [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	672		674
Level 1 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	0		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	827		931
Derivative financial instruments, assets, fair value	5	[1]	7
Derivative financial instruments, liabilities, fair value	13	[1]	94
Level 2 [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	0		0
Level 2 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	827		931
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	0		0
Derivative financial instruments, assets, fair value	0		0
Derivative financial instruments, liabilities, fair value	0		0
Level 3 [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	0		0
Level 3 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities, fair value	$ 0		$ 0

[1] Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. See Note 14: Derivatives and Hedging Activities for additional information.

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Fair Value Measurements and Disclosures (Schedule of Financial Instruments Measured at Other Than Fair Value) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities	[1]	$ 180	$ 152
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		180	152
Cash and cash equivalents		12,950	11,914
Restricted cash		93	95
Net loan receivables		78,819	78,252
Accrued interest receivables		746	724
Deposits		53,024	52,183
Accrued interest payables		191	168
Fair Value, Measurements, Nonrecurring [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		16,870	16,517
Fair Value, Measurements, Nonrecurring [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,222	9,470
Fair Value, Measurements, Nonrecurring [Member] | States and Political Subdivisions of States [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		1	2
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		179	150
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		180	152
Cash and cash equivalents		12,950	11,914
Restricted cash		93	95
Net loan receivables		75,613	75,087
Accrued interest receivables		746	724
Deposits		52,864	51,992
Accrued interest payables		191	168
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		16,738	16,411
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		9,700	9,032
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] | States and Political Subdivisions of States [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		1	2
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		179	150
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0	0
Cash and cash equivalents		12,950	11,914
Restricted cash		93	95
Net loan receivables		0	0
Accrued interest receivables		0	0
Deposits		0	0
Accrued interest payables		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | States and Political Subdivisions of States [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		180	152
Cash and cash equivalents		0	0
Restricted cash		0	0
Net loan receivables		0	0
Accrued interest receivables		746	724
Deposits		53,024	52,183
Accrued interest payables		191	168
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		16,127	15,617
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,222	9,470
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | States and Political Subdivisions of States [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		1	2
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		179	150
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0	0
Cash and cash equivalents		0	0
Restricted cash		0	0
Net loan receivables		78,819	78,252
Accrued interest receivables		0	0
Deposits		0	0
Accrued interest payables		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		743	900
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | States and Political Subdivisions of States [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		$ 0	$ 0

[1] Held-to-maturity investment securities are reported at amortized cost.

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Derivatives and Hedging Activities (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Derivative [Line Items]
Decrease in Derivative Assets and Liabilities due to rulebook change	$ 64
Additional collateral	38
Interest Expense [Member]
Derivative [Line Items]
Cash flow hedge loss to be reclassified to earnings within twelve months	$ (9)
Securitized Debt [Member]
Derivative [Line Items]
Initial maximum period for cash flow hedges (in years)	7 years
Deposits [Member]
Derivative [Line Items]
Initial maximum period for cash flow hedges (in years)	7 years

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Derivatives and Hedging Activities (Schedule of Fair Value and Outstanding Notional Amounts of Derivative Instruments and Related Collateral Balances) (Details) € in Millions, £ in Millions, SGD in Millions, $ in Millions		Jun. 30, 2017 USD ($) transactions		Jun. 30, 2017 SGD transactions	Jun. 30, 2017 EUR (€) transactions	Jun. 30, 2017 GBP (£) transactions	Dec. 31, 2016 USD ($) transactions		Dec. 31, 2016 SGD transactions	Dec. 31, 2016 EUR (€) transactions	Dec. 31, 2016 GBP (£) transactions
Derivatives, Fair Value [Line Items]
Derivative assets	[1]	$ 5					$ 7
Collateral held, derivative assets	[2]	(1)					(2)
Total net derivative assets		4					5
Derivative liabilities	[1]	13					94
Collateral posted, derivative liabilities	[2]	(13)					(94)
Total net derivative liabilities		0					0
Designated as Hedges [Member] | Cash Flow Hedge [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 3,800					3,700
Derivative, number of outstanding derivative contracts (in transactions) | transactions		7		7	7	7
Derivative assets		$ 3	[3]				0
Derivative liabilities		9	[3]				22
Designated as Hedges [Member] | Fair Value Hedge [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 5,645					6,208
Derivative, number of outstanding derivative contracts (in transactions) | transactions		31		31	31	31
Derivative assets		$ 2	[3]				7
Derivative liabilities		4	[3]				72
Not Designated as Hedges [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 0					149
Derivative, number of outstanding derivative contracts (in transactions) | transactions		0		0	0	0
Derivative assets		$ 0					0
Derivative liabilities		0					0
Not Designated as Hedges [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 12	[4]	SGD 1	€ 7	£ 2	13	[4]	SGD 1	€ 6	£ 5
Derivative, number of outstanding derivative contracts (in transactions) | transactions		6		6	6	6
Derivative assets		$ 0					0
Derivative liabilities		0					0
Not Designated as Hedges [Member] | When-Issued Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 2					$ 36
Derivative, number of outstanding derivative contracts (in transactions) | transactions		1		1	1	1	1		1	1	1

[1] In addition to the derivatives disclosed in the table, the Company enters into forward contracts to purchase when-issued mortgage-backed securities as part of its community reinvestment initiatives. At June 30, 2017, the Company had one outstanding contract with a notional amount of $2 million and immaterial fair value. At December 31, 2016, the Company had one outstanding contract with a notional amount of $36 million and immaterial fair value.

[2] Collateral amounts, which consist of both cash and investment securities, are limited to the related derivative asset/liability balance and do not include excess collateral received/pledged. Effective in the first quarter of 2017, collateral held/posted excludes amounts that are recorded as offsets to the associated derivative asset or derivative liability balances.

[3] Effective in the first quarter of 2017, certain cash collateral amounts (variation margin) associated with derivative positions that are cleared through an exchange are reflected as offsets to the associated derivative asset and derivative liability balances, generally reducing the fair values to approximately zero. The affected contracts remain term instruments and are reflected in notional amounts and number of outstanding derivative contracts.

[4] The foreign exchange forward contracts have notional amounts of EUR 7 million, GBP 2 million and SGD 1 million as of June 30, 2017 and notional amounts of EUR 6 million, GBP 5 million and SGD 1 million as of December 31, 2016.

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Derivatives and Hedging Activities (Schedule of Impact of the Derivative Instruments on Income and Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Designated as Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 0	$ (1)	$ 1	$ (1)
Designated as Hedges [Member] | Cash Flow and Net Investment Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) recognized in OCI after amounts reclassified into earnings, pre-tax	8	(10)	19	(53)
Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from OCI into income	(3)	(9)	(8)	(18)
Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount reclassified from OCI into income	(3)	(9)	(8)	(18)
Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	13	13	(3)	44
(Loss) Gain on hedged items	(12)	(13)	4	(44)
Net ineffectiveness gain	1	0	1	0
Increase to interest expense related to net settlements on interest rate swaps	2	8	8	17
Total gain on fair value hedges	3	8	9	17
Not Designated as Hedges [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ (1)	$ 1	$ (1)	$ 0

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Segment Disclosures (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 segment
Segment Reporting [Abstract]
Number of reportable segments (in number of segments)	2

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Segment Disclosures (Schedule of Segment Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Interest income	$ 2,338	$ 2,090	$ 4,616	$ 4,174
Interest expense	400	339	786	673
Net interest income	1,938	1,751	3,830	3,501
Provision for loan losses	640	412	1,226	836
Other income	481	465	928	939
Other expense	912	906	1,797	1,792
Income before income tax expense	867	898	1,735	1,812
Other [Member]
Segment Reporting Information [Line Items]
Interest income	47	28	86	56
Credit Card Loans [Member]
Segment Reporting Information [Line Items]
Interest income	1,916	1,734	3,792	3,467
Provision for loan losses	533	347	1,057	709
Total Other Loans [Member] | Private Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	127	110	251	217
Total Other Loans [Member] | Personal Loans [Member]
Segment Reporting Information [Line Items]
Interest income	207	171	405	338
Provision for loan losses	82	44	140	88
PCI Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	41	47	82	96
Provision for loan losses	0	0	0	0
Operating Segments [Member] | Direct Banking [Member]
Segment Reporting Information [Line Items]
Interest income	2,338	2,090	4,616	4,174
Interest expense	400	339	786	673
Net interest income	1,938	1,751	3,830	3,501
Provision for loan losses	639	411	1,233	834
Other income	408	396	783	802
Other expense	876	868	1,725	1,719
Income before income tax expense	831	868	1,655	1,750
Operating Segments [Member] | Direct Banking [Member] | Other [Member]
Segment Reporting Information [Line Items]
Interest income	47	28	86	56
Operating Segments [Member] | Direct Banking [Member] | Credit Card Loans [Member]
Segment Reporting Information [Line Items]
Interest income	1,916	1,734	3,792	3,467
Operating Segments [Member] | Direct Banking [Member] | Total Other Loans [Member] | Private Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	127	110	251	217
Operating Segments [Member] | Direct Banking [Member] | Total Other Loans [Member] | Personal Loans [Member]
Segment Reporting Information [Line Items]
Interest income	207	171	405	338
Operating Segments [Member] | Direct Banking [Member] | PCI Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	41	47	82	96
Operating Segments [Member] | Payment Services [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net interest income	0	0	0	0
Provision for loan losses	1	1	(7)	2
Other income	73	69	145	137
Other expense	36	38	72	73
Income before income tax expense	36	30	80	62
Operating Segments [Member] | Payment Services [Member] | Other [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Operating Segments [Member] | Payment Services [Member] | Credit Card Loans [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Operating Segments [Member] | Payment Services [Member] | Total Other Loans [Member] | Private Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Operating Segments [Member] | Payment Services [Member] | Total Other Loans [Member] | Personal Loans [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Operating Segments [Member] | Payment Services [Member] | PCI Student Loans [Member]
Segment Reporting Information [Line Items]
Interest income	$ 0	$ 0	$ 0	$ 0