10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

[x] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2018

OR

[ ] 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 1-5823

CNA FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization) 36-6169860 (I.R.S. Employer Identification No.)

151 N. Franklin Chicago, Illinois (Address of principal executive offices) 60606 (Zip Code)

(312) 822-5000

(Registrant's telephone number, including area code)

333 S. Wabash, Chicago, Illinois 60604

(Former name, former address and former fiscal year, if changed since last report)

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 [ ]

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 [ ]

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 [ ] Non-accelerated filer [ ](Do not check if a smaller reporting company) Smaller reporting company [ ] Emerging growth company [ ]

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. [ ]

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

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.

Class	Outstanding at July 26, 2018
Common Stock, Par value $2.50	271,395,494

Item Number		Page Number
	PART I. Financial Information
1.	Condensed Consolidated Financial Statements:
	Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2018 and 2017 (Unaudited)	3
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2018 and 2017 (Unaudited)	4
	Condensed Consolidated Balance Sheets as of June 30, 2018 (Unaudited) and December 31, 2017	5
	Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2018 and 2017 (Unaudited)	6
	Condensed Consolidated Statements of Stockholders' Equity for the six months ended June 30, 2018 and 2017 (Unaudited)	8
	Notes to Condensed Consolidated Financial Statements (Unaudited)	9
2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	44
3.	Quantitative and Qualitative Disclosures About Market Risk	65
4.	Controls and Procedures	65
	PART II. Other Information
1.	Legal Proceedings	66
6.	Exhibits	66

2

PART I. Financial Information

Item 1. Condensed Consolidated Financial Statements

CNA Financial Corporation

Condensed Consolidated Statements of Operations (Unaudited)

Periods ended June 30	Three Months						Six Months
(In millions, except per share data)	2018			2017			2018			2017
Revenues
Net earned premiums	$	1,815		$	1,734		$	3,600		$	3,379
Net investment income	506			475			996			1,020
Net realized investment (losses) gains:
Other-than-temporary impairment losses	—			(2		)	(6		)	(4		)
Other net realized investment (losses) gains	(1		)	52			17			90
Net realized investment (losses) gains	(1		)	50			11			86
Non-insurance warranty revenue (Note J)	248			98			486			191
Other revenues	6			9			16			20
Total revenues	2,574			2,366			5,109			4,696
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	1,327			1,280			2,666			2,573
Amortization of deferred acquisition costs	359			312			655			617
Non-insurance warranty expense (Note J)	225			72			441			142
Other operating expenses	298			292			601			568
Interest	35			40			70			83
Total claims, benefits and expenses	2,244			1,996			4,433			3,983
Income before income tax	330			370			676			713
Income tax expense	(60		)	(98		)	(115		)	(181		)
Net income	$	270		$	272		$	561		$	532
Basic earnings per share	$	0.99		$	1.01		$	2.07		$	1.96
Diluted earnings per share	$	0.99		$	1.00		$	2.06		$	1.96
Dividends declared per share	$	0.30		$	0.25		$	2.60		$	2.50
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	271.5			271.1			271.5			271.0
Diluted	272.4			271.9			272.4			271.9

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

3

CNA Financial Corporation

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)

Periods ended June 30	Three Months					Six Months
(In millions)	2018			2017		2018			2017
Comprehensive Income (Loss)
Net income	$	270		$	272	$	561		$	532
Other Comprehensive (Loss) Income, Net of Tax
Changes in:
Net unrealized gains on investments with other-than-temporary impairments	(1		)	—		(10		)	(4		)
Net unrealized gains on other investments	(159		)	77		(588		)	144
Net unrealized gains on investments	(160		)	77		(598		)	140
Foreign currency translation adjustment	(52		)	42		(40		)	53
Pension and postretirement benefits	7			5		17			12
Other comprehensive (loss) income, net of tax	(205		)	124		(621		)	205
Total comprehensive income (loss)	$	65		$	396	$	(60	)	$	737

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

4

CNA Financial Corporation

Condensed Consolidated Balance Sheets

(In millions, except share data)	June 30, 2018 (Unaudited)			December 31, 2017
Assets
Investments:
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	$	39,795		$	41,487
Equity securities at fair value (cost of $762 and $659)	773			695
Limited partnership investments	2,363			2,369
Other invested assets	48			44
Mortgage loans	865			839
Short term investments	1,308			1,436
Total investments	45,152			46,870
Cash	288			355
Reinsurance receivables (less allowance for uncollectible receivables of $29 and $29)	4,535			4,261
Insurance receivables (less allowance for uncollectible receivables of $44 and $44)	2,598			2,292
Accrued investment income	396			411
Deferred acquisition costs	673			634
Deferred income taxes	296			137
Property and equipment at cost (less accumulated depreciation of $234 and $274)	347			326
Goodwill	147			148
Other assets (Note A)	3,426			1,133
Total assets	$	57,858		$	56,567
Liabilities
Insurance reserves:
Claim and claim adjustment expenses	$	21,990		$	22,004
Unearned premiums	4,410			4,029
Future policy benefits	10,667			11,179
Short term debt	30			150
Long term debt	2,679			2,708
Other liabilities (includes $100 and $143 due to Loews Corporation) (Note A)	6,667			4,253
Total liabilities	46,443			44,323
Commitments and contingencies (Notes C and F)
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 271,391,107 and 271,205,390 shares outstanding)	683			683
Additional paid-in capital	2,179			2,175
Retained earnings	9,216			9,414
Accumulated other comprehensive (loss) income	(605		)	32
Treasury stock (1,649,136and 1,834,853 shares), at cost	(58		)	(60		)
Total stockholders’ equity	11,415			12,244
Total liabilities and stockholders' equity	$	57,858		$	56,567

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

5

CNA Financial Corporation

Condensed Consolidated Statements of Cash Flows (Unaudited)

Six months ended June 30
(In millions)	2018			2017
Cash Flows from Operating Activities
Net income	$	561		$	532
Adjustments to reconcile net income to net cash flows provided by operating activities:
Deferred income tax expense	15			122
Trading portfolio activity	(13		)	(11		)
Net realized investment gains	(11		)	(86		)
Equity method investees	(15		)	42
Net amortization of investments	(30		)	(21		)
Depreciation and amortization	41			43
Changes in:
Receivables, net	(587		)	(195		)
Accrued investment income	15			1
Deferred acquisition costs	(43		)	(41		)
Insurance reserves	563			262
Other assets	(178		)	(118		)
Other liabilities	(11		)	(45		)
Other, net	47			30
Total adjustments	(207		)	(17		)
Net cash flows provided by operating activities	354			515
Cash Flows from Investing Activities
Dispositions:
Fixed maturity securities - sales	4,781			3,142
Fixed maturity securities - maturities, calls and redemptions	1,306			1,770
Equity securities	25			22
Limited partnerships	93			100
Mortgage loans	68			17
Purchases:
Fixed maturity securities	(5,608		)	(4,840		)
Equity securities	(127		)	(8		)
Limited partnerships	(72		)	(47		)
Mortgage loans	(94		)	(72		)
Change in other investments	(6		)	(3		)
Change in short term investments	135			81
Purchases of property and equipment	(76		)	(68		)
Other, net	14			17
Net cash flows provided by investing activities	439			111

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

6

Six months ended June 30
(In millions)	2018			2017
Cash Flows from Financing Activities
Dividends paid to common stockholders	$	(706	)	$	(676	)
Repayment of debt	(150		)	—
Other, net	1			(1		)
Net cash flows used by financing activities	(855		)	(677		)
Effect of foreign exchange rate changes on cash	(5		)	5
Net change in cash	(67		)	(46		)
Cash, beginning of year	355			271
Cash, end of period	$	288		$	225

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

7

CNA Financial Corporation

Condensed Consolidated Statements of Stockholders' Equity (Unaudited)

Six months ended June 30
(In millions)	2018			2017
Common Stock
Balance, beginning of period	$	683		$	683
Balance, end of period	683			683
Additional Paid-in Capital
Balance, beginning of period	2,175			2,173
Stock-based compensation	4			(6		)
Balance, end of period	2,179			2,167
Retained Earnings
Balance, beginning of period, as previously reported	9,414			9,359
Cumulative effect adjustments from changes in accounting guidance, net of tax	(50		)	—
Balance, beginning of period, as adjusted	9,364			9,359
Dividends paid to common stockholders	(709		)	(680		)
Net income	561			532
Balance, end of period	9,216			9,211
Accumulated Other Comprehensive (Loss) Income
Balance, beginning of period, as previously reported	32			(173		)
Cumulative effect adjustments from changes in accounting guidance, net of tax	(16		)	—
Balance, beginning of period, as adjusted	16			(173		)
Other comprehensive (loss) income	(621		)	205
Balance, end of period	(605		)	32
Treasury Stock
Balance, beginning of period	(60		)	(73		)
Stock-based compensation	2			8
Balance, end of period	(58		)	(65		)
Total stockholders' equity	$	11,415		$	12,028

The accompanying Notes are an integral part of these Condensed Consolidated Financial Statements (Unaudited).

8

CNA Financial Corporation

Notes to Condensed Consolidated Financial Statements (Unaudited)

Note A. General

Basis of Presentation

The Condensed Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 89% of the outstanding common stock of CNAF as of June 30, 2018.

The accompanying Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, including certain financial statement notes, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in CNAF's Annual Report on Form 10-K filed with the Securities and Exchange Commission for the year ended December 31, 2017, including the summary of significant accounting policies in Note A. The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

The interim financial data as of June 30, 2018 and for the three and six months ended June 30, 2018 and 2017 is unaudited. However, in the opinion of management, the interim data includes all adjustments, including normal recurring adjustments, necessary for a fair statement of the Company's results for the interim periods. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.

Recently Adopted Accounting Standards Updates (ASU)

ASU 2014-09: In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services.

On January 1, 2018, the Company adopted the updated guidance using the modified retrospective method applied to all contracts which were not completed as of the date of adoption, with the cumulative effect recognized as an adjustment to the opening balance of Retained earnings. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Under the new guidance, revenue on warranty products and services will be recognized more slowly compared to the historic revenue recognition pattern. In addition, for warranty products in which the Company acts as the principal in the transaction, Non-insurance warranty revenue and Non-insurance warranty expense are increased to reflect the gross amount paid by consumers, including the retail seller’s markup which is considered a commission to the Company's agent. This gross-up of revenue and expense also resulted in an increase to Other assets and Other liabilities on the Company's Condensed Consolidated Balance Sheets as the revenue and expense are recognized over the actuarially determined expected claims emergence pattern.

9

The cumulative effect changes to the Condensed Consolidated Balance Sheet for the adoption of the updated guidance on January 1, 2018 were as follows:

(In millions)	Balance as of December 31, 2017		Adjustments Due to Adoption of Topic 606			Balance as of January 1, 2018
Other assets	$	1,133	$	1,882		$	3,015
Other liabilities	4,253		1,969			6,222
Deferred income taxes	137		21			158
Retained earnings	9,414		(66		)	9,348

The impact of adoption on the Condensed Consolidated Statements of Operations and Balance Sheet was as follows:

Periods ended June 30, 2018	Three Months									Six Months
	Prior to Adoption			Effect of Adoption			As Reported			Prior to Adoption			Effect of Adoption			As Reported
(In millions)
Statement of operations:
Non-insurance warranty revenue	$	105		$	143		$	248		$	206		$	280		$	486
Total revenues	2,431			143			2,574			4,829			280			5,109
Non-insurance warranty expense	80			145			225			158			283			441
Total claims, benefits and expenses	2,099			145			2,244			4,150			283			4,433
Income before income tax	332			(2		)	330			679			(3		)	676
Income tax expense	(61		)	1			(60		)	(116		)	1			(115		)
Net income	271			(1		)	270			563			(2		)	561
Balance sheet(1) at June 30, 2018:
Other assets										$	3,228		$	198		$	3,426
Other liabilities										6,466			201			6,667
Deferred income taxes										295			1			296
Retained earnings										9,218			(2		)	9,216

(1) The Prior to Adoption amounts presented include the cumulative effect adjustment at adoption.

See Note J to the Condensed Consolidated Financial Statements for additional information regarding non-insurance revenues from contracts with customers.

10

ASU 2016-01: 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 updated accounting guidance requires changes to the reporting model for financial instruments. The guidance primarily changes the model for equity securities by requiring changes in the fair value of equity securities (except those accounted for under the equity method of accounting, those without readily determinable fair values and those that result in consolidation of the investee) to be recognized through the income statement. The Company adopted the updated guidance on January 1, 2018 and recognized a cumulative effect adjustment that increased beginning Retained earnings by $28 million, net of tax. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

For the three and six months ended June 30, 2018, the Company recognized $10 million and $25 million in pretax losses within Net realized investment gains (losses) for the change in fair value of non-redeemable preferred stock and $2 million and $2 million in pretax gains within Net investment income for the change in fair value of common stock as a result of this change. For the three and six months ended June 30, 2017, there was less than a $1 million decrease and a $1 million decrease in the fair value of common stock and a $2 million increase and a $7 million increase in the fair value of non-redeemable preferred stock recognized in Other comprehensive income. The Company's non-redeemable preferred stock contain characteristics of debt securities, are priced similarly to bonds, and are held primarily for income generation through periodic dividends. While recognition of gains and losses on these securities are no longer discretionary, management does not consider the changes in fair value of non-redeemable preferred stock to be reflective of our primary operations. As such, the changes in the fair value of these securities are recorded through Net realized investments gains (losses). The company owns certain common stock with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income.

ASU 2017-07: In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The updated accounting guidance requires changes to the presentation of the components of net periodic benefit cost on the income statement by requiring service cost to be presented with other employee compensation costs and other components of net periodic pension cost to be presented outside of any subtotal of operating income. The ASU also stipulates that only the service cost component of net benefit cost is eligible for capitalization. The Company adopted the updated guidance effective January 1, 2018. The guidance was applied on a prospective basis for capitalization of service costs and on a retrospective basis for the presentation of the service cost and other components of net periodic benefit costs in the Company's Condensed Consolidated Statements of Operations and in its disclosures. The Company expanded the related footnote disclosure, Note G to the Condensed Consolidated Financial Statements, to disclose the amount of service cost and non-service cost components of net periodic benefit cost and the line items in the Condensed Consolidated Statements of Operations in which such amounts are reported. The change limiting the costs eligible for capitalization is not material to the Company’s results of operations or financial position.

ASU 2018-02: In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. GAAP requires the remeasurement of deferred tax assets and liabilities due to a change in the tax rate to be included in Net income, even if the related income tax effects were originally recognized in Accumulated other comprehensive income (AOCI). The ASU allows a reclassification from AOCI to Retained earnings for stranded tax effects resulting from the new U.S. Federal corporate income tax rate enacted on December 22, 2017. The Company early adopted the updated guidance effective January 1, 2018 and elected to reclassify the stranded income tax effects relating to the reduction in the Federal corporate income tax rate from AOCI to Retained earnings at the beginning of the period of adoption. The net impact of the accounting change resulted in a $12 million increase in AOCI and a corresponding decrease in Retained earnings. The $12 million increase in AOCI is comprised of a $142 million increase in net unrealized gains (losses) on investments partially offset by a $130 million decrease in unrecognized pension and postretirement benefits.

The Company releases tax effects from AOCI utilizing the security-by-security approach for Net unrealized gains (losses) on investments with Other-than-temporary impairment (OTTI) losses and Net unrealized gains (losses) on other investments. For Pension and postretirement benefits, tax effects from AOCI are released at enacted tax rates based on the pre-tax adjustments to pension liabilities or assets recognized within OCI.

11

Accounting Standards Pending Adoption

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet assets and liabilities for the rights and obligations created by the majority of leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the use of the allowance method rather than the write-down method for credit losses within the available-for-sale fixed maturities portfolio. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

Income Tax Reform Update

On December 22, 2017, H.R.1, “An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018,” was signed into law (Tax Reform Legislation).

Shortly after enactment, the Securities and Exchange Commission Staff issued Staff Accounting Bulletin No. 118 (SAB 118) to provide guidance on accounting for the Tax Reform Legislation impacts when the measurements of the income tax effects are complete, incomplete, or incomplete but for which a provisional amount can be estimated. SAB 118 permits the recognition of provisional amounts, and adjustments to provisional amounts, in subsequent reporting periods within the one year measurement period.

The Company has reflected the following incomplete but reasonably estimated provisional items in Deferred income taxes on the Condensed Consolidated Balance Sheet at June 30, 2018. The effects of the adjustments to the Company’s provisional amounts for the three and six months ended June 30, 2018 did not impact income tax expense.

• The Company has recalculated its insurance reserves and the transition adjustment from existing law.

• The Company has recalculated amounts under special accounting method provisions for recognizing income for Federal income tax purposes no later than for financial accounting purposes and the transition adjustment from existing law.

• The Company has not recorded current or deferred taxes with respect to the international provisions since it does not expect to have inclusions in U.S. taxable income for certain earnings of foreign subsidiaries in future years.

12

Note B. Earnings (Loss) Per Share

Earnings (loss) per share is based on the weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

For the three and six months ended June 30, 2018, approximately 835 thousand and 929 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, approximately 445 thousand and 2 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share, because the effect would have been antidilutive.

For the three and six months ended June 30, 2017, approximately 847 thousand and 915 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, less than 1 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share, because the effect would have been antidilutive.

13

Note C. Investments

The significant components of Net investment income are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Fixed maturity securities	$	444		$	457		$	890		$	912
Equity securities	12			2			22			3
Limited partnership investments	40			16			70			106
Mortgage loans	14			8			25			15
Short term investments	6			3			12			6
Trading portfolio	3			4			5			6
Other	3			—			3			1
Gross investment income	522			490			1,027			1,049
Investment expense	(16		)	(15		)	(31		)	(29		)
Net investment income	$	506		$	475		$	996		$	1,020

During the three and six months ended June 30, 2018, $2 million and $1 million of Net investment income was recognized due to the change in fair value of common stock still held as of June 30, 2018.

Net realized investment gains (losses) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	37		$	56		$	106		$	105
Gross realized losses	(33		)	(12		)	(84		)	(29		)
Net realized investment gains (losses) on fixed maturity securities	4			44			22			76
Equity securities	(10		)	—			(25		)	—
Derivatives	4			(3		)	9			(2		)
Short term investments and other	1			9			5			12
Net realized investment gains (losses)	$	(1	)	$	50		$	11		$	86

During the three and six months ended June 30, 2018, $10 million and $25 million of Net realized investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2018.

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Periods ended June 30	Three Months				Six Months
(In millions)	2018		2017		2018		2017
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	—	$	2	$	5	$	4
Asset-backed	—		—		1		—
OTTI losses recognized in earnings	$	—	$	2	$	6	$	4

14

The following tables present a summary of fixed maturity and equity securities.

June 30, 2018 (1)	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,883	$	938	$	203	$	18,618	$	—
States, municipalities and political subdivisions	10,856		1,161		8		12,009		—
Asset-backed:
Residential mortgage-backed	4,961		72		85		4,948		(25		)
Commercial mortgage-backed	2,082		23		33		2,072		—
Other asset-backed	1,557		9		9		1,557		—
Total asset-backed	8,600		104		127		8,577		(25		)
U.S. Treasury and obligations of government-sponsored enterprises	127		3		3		127		—
Foreign government	436		6		5		437		—
Redeemable preferred stock	9		1		—		10		—
Total fixed maturity securities available-for-sale	37,911		2,213		346		39,778		$	(25	)
Total fixed maturity securities trading	17						17
Total fixed maturity securities	$	37,928	$	2,213	$	346	$	39,795

December 31, 2017	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,210	$	1,625	$	28	$	18,807	$	—
States, municipalities and political subdivisions	12,478		1,551		2		14,027		(11		)
Asset-backed:
Residential mortgage-backed	5,043		109		32		5,120		(27		)
Commercial mortgage-backed	1,840		46		14		1,872		—
Other asset-backed	1,083		16		5		1,094		—
Total asset-backed	7,966		171		51		8,086		(27		)
U.S. Treasury and obligations of government-sponsored enterprises	111		2		4		109		—
Foreign government	437		9		2		444		—
Redeemable preferred stock	10		1		—		11		—
Total fixed maturity securities available-for-sale	38,212		3,359		87		41,484		$	(38	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	21		7		1		27
Preferred stock	638		31		1		668
Total equity securities available-for-sale	659		38		2		695
Total fixed maturity and equity securities	$	38,874	$	3,397	$	89	$	42,182

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

15

The net unrealized gains on investments included in the tables above are recorded as a component of AOCI. When presented in AOCI, these amounts are net of tax and any required Shadow Adjustments. To the extent that unrealized gains on fixed income securities supporting certain products within the Life & Group segment would result in a premium deficiency if realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (loss) (Shadow Adjustments). As of June 30, 2018 and December 31, 2017, the net unrealized gains on investments included in AOCI were correspondingly reduced by Shadow Adjustments of $1,186 million and $1,411 million.

16

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
June 30, 2018 (1)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	6,963	$	192	$	193	$	11	$	7,156	$	203
States, municipalities and political subdivisions	723		8		3		—		726		8
Asset-backed:
Residential mortgage-backed	3,183		68		344		17		3,527		85
Commercial mortgage-backed	913		16		228		17		1,141		33
Other asset-backed	632		6		27		3		659		9
Total asset-backed	4,728		90		599		37		5,327		127
U.S. Treasury and obligations of government-sponsored enterprises	49		1		19		2		68		3
Foreign government	178		3		40		2		218		5
Total	$	12,641	$	294	$	854	$	52	$	13,495	$	346

	Less than 12 Months				12 Months or Longer				Total
December 31, 2017	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	1,354	$	21	$	168	$	7	$	1,522	$	28
States, municipalities and political subdivisions	72		1		85		1		157		2
Asset-backed:
Residential mortgage-backed	1,228		5		947		27		2,175		32
Commercial mortgage-backed	403		4		212		10		615		14
Other asset-backed	248		3		18		2		266		5
Total asset-backed	1,879		12		1,177		39		3,056		51
U.S. Treasury and obligations of government-sponsored enterprises	49		2		21		2		70		4
Foreign government	166		2		4		—		170		2
Total fixed maturity securities available-for-sale	3,520		38		1,455		49		4,975		87
Equity securities available-for-sale:
Common stock	7		1		—		—		7		1
Preferred stock	93		1		—		—		93		1
Total equity securities available-for-sale	100		2		—		—		100		2
Total	$	3,620	$	40	$	1,455	$	49	$	5,075	$	89

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

17

Based on current facts and circumstances, the Company believes the unrealized losses presented in the June 30, 2018 securities in a gross unrealized loss position table above are not indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. The Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional OTTI losses to be recorded as of June 30, 2018.

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of June 30, 2018 and 2017 and for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Beginning balance of credit losses on fixed maturity securities	$	25		$	32		$	27		$	36
Reductions for securities sold during the period	(4		)	(2		)	(6		)	(6		)
Ending balance of credit losses on fixed maturity securities	$	21		$	30		$	21		$	30

Contractual Maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

	June 30, 2018				December 31, 2017
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,301	$	1,322	$	1,135	$	1,157
Due after one year through five years	8,211		8,421		8,165		8,501
Due after five years through ten years	16,138		16,240		16,060		16,718
Due after ten years	12,261		13,795		12,852		15,108
Total	$	37,911	$	39,778	$	38,212	$	41,484

Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life.

Derivative Financial Instruments

The Company holds an embedded derivative on a funds withheld liability with a notional value of $161 million and $167 million as of June 30, 2018 and December 31, 2017 and a fair value of $4 million and $(3) million as of June 30, 2018 and December 31, 2017. The embedded derivative on the funds withheld liability is accounted for separately and reported with the funds withheld liability in Other liabilities on the Condensed Consolidated Balance Sheets.

Investment Commitments

As of June 30, 2018, the Company had committed approximately $551 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships.

As of June 30, 2018, the Company had mortgage loan commitments of $15 million representing signed loan applications received and accepted.

The Company invests in various privately placed debt securities, including bank loans, as part of its overall investment strategy and has committed to additional future purchases, sales and funding. Purchases and sales of privately placed debt securities are recorded once funded. As of June 30, 2018, the Company had commitments to purchase or fund additional amounts of $272 million and sell $111 million under the terms of such securities.

18

Note D. Fair Value

Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable.

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.

Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are not observable.

Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general, the Company seeks to price securities using third-party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs the Company believes market participants would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted by the Company.

The Company performs control procedures over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include i) the review of pricing service methodologies or broker pricing qualifications, ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria, iv) deep dives, where the Company performs an independent analysis of the inputs and assumptions used to price individual securities and v) pricing validation, where prices received are compared to prices independently estimated by the Company.

19

Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the U.S. Treasury, government-sponsored enterprises and foreign governments and redeemable preferred stock.

June 30, 2018								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	166	$	18,949		$	94	$	19,209
States, municipalities and political subdivisions	—		12,008			1		12,009
Asset-backed	—		8,304			273		8,577
Total fixed maturity securities	166		39,261			368		39,795
Equity securities:
Common stock	85		—			4		89
Non-redeemable preferred stock	67		604			13		684
Total equity securities	152		604			17		773
Short term and other	167		1,050			—		1,217
Total assets	$	485	$	40,915		$	385	$	41,785
Liabilities
Other liabilities	$	—	$	(4	)	$	—	$	(4	)
Total liabilities	$	—	$	(4	)	$	—	$	(4	)

December 31, 2017							Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2		Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	128	$	19,148	$	98	$	19,374
States, municipalities and political subdivisions	—		14,026		1		14,027
Asset-backed	—		7,751		335		8,086
Total fixed maturity securities	128		40,925		434		41,487
Equity securities:
Common stock	23		—		4		27
Non-redeemable preferred stock	68		584		16		668
Total equity securities	91		584		20		695
Short term and other	396		958		—		1,354
Total assets	$	615	$	42,467	$	454	$	43,536
Liabilities
Other liabilities	$	—	$	3	$	—	$	3
Total liabilities	$	—	$	3	$	—	$	3

20

The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of April 1, 2018	$	100		$	1	$	279		$	18		$	—	$	398
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		—			(1		)	—		(1		)
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(1		)	—			—		(2		)
Total realized and unrealized investment gains (losses)	(1		)	—		(1		)	(1		)	—		(3		)
Purchases	2			—		41			—			—		43
Sales	(5		)	—		—			—			—		(5		)
Settlements	(2		)	—		(6		)	—			—		(8		)
Transfers into Level 3	—			—		13			—			—		13
Transfers out of Level 3	—			—		(53		)	—			—		(53		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(1	)	$	—	$	(1	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Life settlement contracts			Total
Balance as of April 1, 2017	$	121		$	1	$	256		$	19		$	—	$	46		$	443
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			—		—			1
Reported in Other revenues	—			—		—			—			—		—			—
Reported in Other comprehensive income	—			—		1			1			—		—			2
Total realized and unrealized investment gains (losses)	—			—		2			1			—		—			3
Purchases	—			—		13			—			—		—			13
Sales	—			—		—			(1		)	—		(45		)	(46		)
Settlements	(11		)	—		(7		)	—			—		—			(18		)
Transfers into Level 3	—			—		24			—			—		—			24
Transfers out of Level 3	(10		)	—		(70		)	—			—		—			(80		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—	$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—	$	—		$	—

21

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of January 1, 2018	$	98		$	1	$	335		$	20		$	—	$	454
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	(1		)	—		7			(3		)	—		3
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(6		)	—			—		(7		)
Total realized and unrealized investment gains (losses)	(2		)	—		1			(3		)	—		(4		)
Purchases	2			—		71			—			—		73
Sales	(5		)	—		(72		)	—			—		(77		)
Settlements	(4		)	—		(12		)	—			—		(16		)
Transfers into Level 3	5			—		13			—			—		18
Transfers out of Level 3	—			—		(63		)	—			—		(63		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(3	)	$	—	$	(3	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments			Life settlement contracts			Total
Balance as of January 1, 2017	$	130		$	1	$	199		$	19		$	—		$	58		$	407
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			1			—			2
Reported in Other revenues	—			—		—			—			—			6			6
Reported in Other comprehensive income	1			—		3			2			—			—			6
Total realized and unrealized investment gains (losses)	1			—		4			2			1			6			14
Purchases	5			—		51			1			—			—			57
Sales	(1		)	—		—			(3		)	(1		)	(58		)	(63		)
Settlements	(25		)	—		(13		)	—			—			(5		)	(43		)
Transfers into Level 3	—			—		52			—			—			—			52
Transfers out of Level 3	(10		)	—		(75		)	—			—			—			(85		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—		$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—		$	—		$	—

22

Securities may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. During the three months ended June 30, 2018, there were no transfers between Level 1 and Level 2. During the six months ended June 30, 2018, there were $29 million of transfers from Level 2 to Level 1 and no transfers from Level 1 to Level 2. During the three and six months ended June 30, 2017 there were no transfers between Level 1 and Level 2. The Company's policy is to recognize transfers between levels at the beginning of quarterly reporting periods.

23

Valuation Methodologies and Inputs

The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified.

Fixed Maturity Securities

Level 1 securities include highly liquid and exchange traded bonds and redeemable preferred stock, valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology, or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with inputs that are not market observable.

Equity Securities

Level 1 securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with inputs that are not market observable.

Short Term and Other Invested Assets

Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds and treasury bills. Level 2 primarily includes commercial paper, for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short term investments as presented in the tables above differ from the amounts presented on the Condensed Consolidated Balance Sheets because certain short term investments, such as time deposits, are not measured at fair value.

As of June 30, 2018 and December 31, 2017, there were approximately $42 million and $39 million of overseas deposits within other invested assets, which can be redeemed at net asset value in 90 days or less. Overseas deposits are excluded from the fair value hierarchy because their fair value is recorded using the net asset value per share (or equivalent) practical expedient.

Life Settlement Contracts

The Company sold its life settlement contracts to a third party in 2017. The valuation of the life settlement contracts was based on the terms of sale. The contracts were classified as Level 3 as there was not an active market for life settlement contracts.

Derivative Financial Investments

Level 2 investments primarily include the embedded derivative on the funds withheld liability. The embedded derivative on funds withheld liability is valued using the change in fair value of the assets supporting the funds withheld liability, which are fixed maturity securities valued with observable inputs.

24

Significant Unobservable Inputs

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company.

June 30, 2018	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	130	Discounted cash flow	Credit spread	1% - 12% (3%)

December 31, 2017	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	136	Discounted cash flow	Credit spread	1% - 12% (3%)

For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement.

Financial Assets and Liabilities Not Measured at Fair Value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables.

June 30, 2018	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	865	$	—	$	—	$	850	$	850
Note receivable	34		—		—		34		34
Liabilities
Short term debt	$	30	$	—	$	30	$	—	$	30
Long term debt	2,679		—		2,754		—		2,754

December 31, 2017	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	839	$	—	$	—	$	844	$	844
Note receivable	46		—		—		46		46
Liabilities
Short term debt	$	150	$	—	$	150	$	—	$	150
Long term debt	2,708		—		2,896		—		2,896

The following methods and assumptions were used to estimate the fair value of these financial assets and liabilities.

The fair values of mortgage loans were based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar quality loans, adjusted for specific loan risk.

The fair value of the note receivable was based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar notes, adjusted for specific credit risk.

The Company's senior notes and debentures were valued based on observable market prices. The fair value for other debt was estimated using discounted cash flows based on current incremental borrowing rates for similar borrowing arrangements.

The carrying amounts reported on the Condensed Consolidated Balance Sheets for Cash, Short term investments not carried at fair value, Accrued investment income and certain Other assets and Other liabilities approximate fair value due to the short term nature of these items. These assets and liabilities are not listed in the tables above.

25

Note E. Claim and Claim Adjustment Expense Reserves

The Company's property and casualty insurance claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including incurred but not reported (IBNR) claims as of the reporting date. The Company's reserve projections are based primarily on detailed analysis of the facts in each case, the Company's experience with similar cases and various historical development patterns. Consideration is given to such historical patterns as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, as well as court decisions, economic conditions, including inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves.

Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers' compensation, general liability and professional liability claims. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the Company's ultimate cost for insurance losses will not exceed current estimates.

Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in the Company's results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $26 million and $60 million for the three and six months ended June 30, 2018. The company reported catastrophe losses, net of reinsurance, of $39 million and $73 million for the three and six months ended June 30, 2017. Net catastrophe losses in 2018 and 2017 related primarily to U.S. weather-related events.

26

Liability for Unpaid Claim and Claim Adjustment Expenses Rollforward

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group segment.

For the six months ended June 30
(In millions)	2018			2017
Reserves, beginning of year:
Gross	$	22,004		$	22,343
Ceded	3,934			4,094
Net reserves, beginning of year	18,070			18,249
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	2,552			2,443
Decrease in provision for insured events of prior years	(112		)	(159		)
Amortization of discount	92			93
Total net incurred (1)	2,532			2,377
Net payments attributable to:
Current year events	(312		)	(266		)
Prior year events	(2,387		)	(2,331		)
Total net payments	(2,699		)	(2,597		)
Foreign currency translation adjustment and other	(70		)	70
Net reserves, end of period	17,833			18,099
Ceded reserves, end of period	4,157			4,080
Gross reserves, end of period	$	21,990		$	22,179

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits which are not reflected in the table above.

Net Prior Year Development

Changes in estimates of claim and claim adjustment expense reserves, net of reinsurance, for prior years are defined as net prior year loss reserve development (development). These changes can be favorable or unfavorable. The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Specialty	$	(44	)	$	(23	)	$	(74	)	$	(35	)
Commercial	(13		)	(34		)	(22		)	(77		)
International	(2		)	2			(2		)	—
Corporate & Other	—			—			—			—
Total pretax (favorable) unfavorable development	$	(59	)	$	(55	)	$	(98	)	$	(112	)

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Specialty

The following table presents further detail of the development recorded for the Specialty segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	3		$	2		$	23		$	22
Other Professional Liability and Management Liability	(34		)	(37		)	(68		)	(69		)
Surety	(15		)	—			(30		)	—
Warranty	(6		)	6			(6		)	6
Other	8			6			7			6
Total pretax (favorable) unfavorable development	$	(44	)	$	(23	)	$	(74	)	$	(35	)

Three Months

2018

Favorable development in other professional liability and management liability was primarily in professional liability errors and omissions (E&O) reflecting lower than expected claim frequency in accident years 2014 through 2016 and favorable severity for accident years 2012 and prior.

Favorable development in surety was driven by continued lower than expected loss emergence on accident years 2015 and prior. 

2017

Favorable development in other professional liability and management liability was primarily due to lower than expected claim frequency in accident years 2013 through 2015 and lower than expected severity in accident years 2014 through 2016 for professional liability.

Six Months

2018

Unfavorable development for medical professional liability was primarily due to higher than expected severity in accident years 2014 and 2017 in our hospitals business.

Favorable development in other professional liability and management liability was primarily due to lower than expected claim frequency for accident years 2013 through 2017 related to financial institutions. Additional favorable development was in professional liability errors and omissions (E&O) reflecting lower than expected claim frequency in accident years 2014 through 2016 and favorable severity for accident years 2012 and prior.

Favorable development for surety was due to continued lower than expected loss emergence for accident years 2015 and prior.

2017

Unfavorable development in medical professional liability was primarily due to continued higher than expected frequency in aging services.

Favorable development in other professional liability and management liability was primarily due to favorable settlements on closed claims and a lower than expected frequency of large losses for accident years 2011 through 2016 for professional and management liability, lower than expected claim frequency in accident years 2013 through 2015 for professional liability and lower than expected severity in accident years 2014 through 2016 for professional liability.

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Commercial

The following table presents further detail of the development recorded for the Commercial segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Commercial Auto	$	—		$	1		$	(1	)	$	(25	)
General Liability	26			1			18			(17		)
Workers' Compensation	(6		)	(47		)	(12		)	(47		)
Property and Other	(33		)	11			(27		)	12
Total pretax (favorable) unfavorable development	$	(13	)	$	(34	)	$	(22	)	$	(77	)

Three Months

2018

Unfavorable development in general liability was driven by higher than expected claim severity in umbrella in accident years 2013 through 2015. 

Favorable development in property and other was driven by lower than expected claim severity from catastrophes in accident year 2017.

2017

Favorable development for workers’ compensation was primarily related to decreases in frequency and severity in recent accident years, partially attributable to California reforms related to decreases in medical costs.

Unfavorable development for property and other was primarily due to higher than expected severity in accident year 2016.

Six Months

2018

Unfavorable development in general liability was driven by higher than expected claim severity in umbrella in accident years 2013 through 2015. 

Favorable development in property and other was driven by lower than expected claim severity from catastrophes in accident year 2017.

2017

Favorable development for commercial auto was primarily due to lower than expected severity in accident years 2013 through 2015.

Favorable development for general liability was due to lower than expected severity in life sciences.

Favorable development for workers’ compensation was primarily related to decreases in frequency and severity in recent accident years, partially attributable to California reforms related to decreases in medical costs.

Unfavorable development for property and other was primarily due to higher than expected severity in accident year 2016.

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International

The following table presents further detail of the development recorded for the International segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Casualty	$	(6	)	$	1		$	(6	)	$	1
Property	12			(10		)	12			(11		)
Energy and Marine	(5		)	(3		)	(5		)	(3		)
Specialty	9			16			9			15
Healthcare and Technology	(12		)	(2		)	(12		)	(2		)
Total pretax (favorable) unfavorable development	$	(2	)	$	2		$	(2	)	$	—

Three Months

2018

Unfavorable development in property was primarily driven by higher than expected severity in Canada and higher than expected frequency in Hardy, both in accident year 2017.

Unfavorable development in specialty was driven by increased severity in accident year 2017 related to professional indemnity.

Favorable development in healthcare and technology was primarily driven by lower than expected frequency in accident years 2015 and prior related to healthcare in Europe.

2017

Favorable development for property was due to better than expected frequency in accident years 2014 through 2016.

Unfavorable development for specialty was primarily due to higher than expected severity in accident year 2015 arising from the management liability business, partially offset by favorable development in accident years 2014 and prior. Additional unfavorable development was related to adverse large claims experience in the Hardy political risks portfolio, relating largely to accident year 2016.

Six Months

2018

The drivers of development for the six month period were consistent with the three month summary above.

2017

The drivers of development for the six month period were generally consistent with the three month summary above.

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Asbestos and Environmental Pollution (A&EP) Reserves

In 2010, Continental Casualty Company (CCC) together with several of the Company’s other insurance subsidiaries completed a transaction with National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the Company’s legacy A&EP liabilities were ceded to NICO through a Loss Portfolio Transfer (LPT). At the effective date of the transaction, the Company ceded approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves to NICO under a retroactive reinsurance agreement with an aggregate limit of $4 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third-party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third-party reinsurance related to these liabilities. The Company paid NICO a reinsurance premium of $2 billion and transferred to NICO billed third-party reinsurance receivables related to A&EP claims with a net book value of $215 million, resulting in total consideration of $2.2 billion.

In years subsequent to the effective date of the LPT, the Company recognized adverse prior year development on its A&EP reserves resulting in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT have exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which the Company recognizes a change in the estimate of A&EP reserves that increases or decreases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is affected and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders' benefits in the Condensed Consolidated Statement of Operations.

The following table presents the impact of the Loss Portfolio Transfer on the Condensed Consolidated Statements of Operations.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Additional amounts ceded under LPT:
Net A&EP adverse development before consideration of LPT	$	—		$	—		$	113		$	60
Provision for uncollectible third-party reinsurance on A&EP	—			—			(16		)	—
Total additional amounts ceded under LPT	—			—			97			60
Retroactive reinsurance benefit recognized	(15		)	(3		)	(72		)	(43		)
Pretax impact of deferred retroactive reinsurance	$	(15	)	$	(3	)	$	25		$	17

Based upon the Company's annual A&EP reserve review, net unfavorable prior year development of $113 million and $60 million was recognized before consideration of cessions to the LPT for the six months ended June 30, 2018 and 2017. Additionally, in 2018, the Company released a portion of its provision for uncollectible third party reinsurance. The 2018 unfavorable development was driven by higher than anticipated defense costs on direct asbestos environmental accounts and paid losses on assumed reinsurance exposures. The 2017 unfavorable development was driven by modestly higher anticipated payouts on claims from known sources of asbestos exposure. While the unfavorable development was ceded to NICO under the LPT, the Company’s Net income for the six month periods were negatively affected due to the application of retroactive reinsurance accounting.

As of June 30, 2018 and December 31, 2017, the cumulative amounts ceded under the LPT were $3.0 billion and $2.9 billion. The unrecognized deferred retroactive reinsurance benefit was $351 million and $326 million as of June 30, 2018 and December 31, 2017.

NICO established a collateral trust account as security for its obligations to the Company. The fair value of the collateral trust account was $3.0 billion and $3.1 billion as of June 30, 2018 and December 31, 2017. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to the Company’s A&EP claims.

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Note F. Legal Proceedings, Contingencies and Guarantees

CNA 401(k) Plus Plan Litigation

In September 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (CAC) (a former subsidiary of CCC), CNAF, the Investment Committee of the CNA 401(k) Plus Plan (Plan), The Northern Trust Company and John Does 1-10 (collectively Defendants) related to the Plan. The complaint alleges that Defendants breached fiduciary duties to the Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the Plan's Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of Plan participants who had invested in the Fixed Income Fund suffered lower returns in their Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. The Plan trustees have provided notice to their fiduciary coverage insurance carriers.

The plaintiff, Defendants and the Plan's fiduciary insurance carriers have agreed on terms to settle this matter and have executed settlement agreements. The plaintiff and Defendants have proposed a class settlement for court approval, and the court granted preliminary approval subject to a fairness hearing. Based on the executed settlement agreements, management has recorded its best estimate of the Company's probable loss and does not believe that the ultimate resolution of this matter will have a material impact on the Company’s results of operations or financial position.

Small Business Premium Rate Adjustment

In 2016 and 2017, the Company identified rating errors related to its multi-peril package product and workers' compensation policies within its Small Business unit and determined that it would voluntarily issue premium refunds along with interest on affected policies. After the rating errors were identified, written and earned premium have been reported net of any impact from the premium rate adjustments. The Company increased Earned premium by $1 million and reduced Earned premium by $37 million for the three and six months ended June 30, 2017. Interest expense increased for interest due to policyholders on the premium rate adjustments by $1 million and $6 million for the three and six months ended June 30, 2017.

The policyholder refunds for the multi-peril package product were issued in the third quarter of 2017. The policyholder refunds for workers’ compensation policies are in process and are expected to be completed by the end of 2018. Interest expense of $1 million was recorded for the six months ended June 30, 2018. The estimated refund liability, including interest, for the workers' compensation policies as of June 30, 2018 was $47 million.

Other Litigation

The Company is a party to other routine litigation incidental to its business, which, based on the facts and circumstances currently known, is not material to the Company's results of operations or financial position.

Guarantees

As of June 30, 2018 and December 31, 2017, the Company had recorded liabilities of approximately $5 million related to guarantee and indemnification agreements and management believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, the Company agreed to guarantee the performance of certain obligations of previously owned subsidiaries and to indemnify purchasers for losses arising out of breaches of representations and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. Such guarantee and indemnification agreements in effect for sales of business entities, assets and third-party loans may include provisions that survive indefinitely. As of June 30, 2018, the aggregate amount related to quantifiable guarantees was $375 million and the aggregate amount related to quantifiable indemnification agreements was $252 million. In certain cases, should the Company be required to make payments under any such guarantee, it would have the right to seek reimbursement from an affiliate of a previously owned subsidiary.

In addition, the Company has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of June 30, 2018, the Company had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser's ownership of an entity or asset, defects

32

in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. Certain provisions of the indemnification agreements survive indefinitely, while others survive until the applicable statutes of limitation expire, or until the agreed-upon contract terms expire.

The Company also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of June 30, 2018, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.8 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

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Note G. Benefit Plans

The components of net periodic pension cost (benefit) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net periodic pension cost (benefit)
Service cost	$	—		$	—		$	—		$	—
Non-service cost:
Interest cost on projected benefit obligation	24			26			47			52
Expected return on plan assets	(40		)	(39		)	(80		)	(78		)
Amortization of net actuarial loss	9			9			18			18
Settlement loss	1			—			5			2
Total non-service cost	(6		)	(4		)	(10		)	(6		)
Total net periodic pension cost (benefit)	$	(6	)	$	(4	)	$	(10	)	$	(6	)

For the three and six months ended June 30, 2018, the Company recognized $2 million and $3 million of non-service cost in Insurance claims and policyholders' benefits and $4 million and $7 million of non-service cost in Other operating expenses.

For the three and six months ended June 30, 2017, the Company recognized $1 million and $2 million of non-service cost in Insurance claims and policyholders' benefits and $3 million and $4 million of non-service cost in Other operating expenses.

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Note H. Accumulated Other Comprehensive Income (Loss) by Component

The tables below display the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2018	$	21		$	430		$	(765	)	$	(86	)	$	(400	)
Other comprehensive income (loss) before reclassifications	(1		)	(156		)	—			(52		)	(209		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(1), $2, $- and $1	—			3			(7		)	—			(4		)
Other comprehensive income (loss) net of tax (expense) benefit of $1, $46, $(2), $- and $45	(1		)	(159		)	7			(52		)	(205		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2017	$	26		$	709	$	(640	)	$	(187	)	$	(92	)
Other comprehensive income (loss) before reclassifications	(1		)	108		—			42			149
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $1, $(15), $3, $-, and $(11)	(1		)	31		(5		)	—			25
Other comprehensive income (loss) net of tax (expense) benefit of $-, $(48), $(3), $- and $(51)	—			77		5			42			124
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

35

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2018, as previously reported	$	25		$	750		$	(645	)	$	(98	)	$	32
Cumulative effect adjustment from accounting change for adoption of ASU 2018-02(1)	5			137			(130		)	—			12
Cumulative effect adjustment from accounting change for adoption of ASU 2016-01(1) net of tax (expense) benefit of $-, $8, $-, $- and $8	—			(28		)	—			—			(28		)
Balance as of January 1, 2018, as adjusted	30			859			(775		)	(98		)	16
Other comprehensive income (loss) before reclassifications	(11		)	(570		)	—			(40		)	(621		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(5), $5, $- and $-	(1		)	18			(17		)	—			—
Other comprehensive income (loss) net of tax (expense) benefit of $3, $155, $(5), $- and $153	(10		)	(588		)	17			(40		)	(621		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(1) See Note A to the Condensed Consolidated Financial Statements for additional information.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2017	$	30		$	642	$	(647	)	$	(198	)	$	(173	)
Other comprehensive income (loss) before reclassifications	(1		)	193		—			53			245
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(1), $(24), $7, $- and $(18)	3			49		(12		)	—			40
Other comprehensive income (loss) net of tax (expense) benefit of $1, $(86), $(7), $- and $(92)	(4		)	144		12			53			205
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows:

Component of AOCI	Condensed Consolidated Statements of Operations Line Item Affected by Reclassifications
Net unrealized gains (losses) on investments with OTTI losses	Net realized investment gains (losses)
Net unrealized gains (losses) on other investments	Net realized investment gains (losses)
Pension and postretirement benefits	Other operating expenses and Insurance claims and policyholders' benefits

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Note I. Business Segments

The Company's property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. These three segments are collectively referred to as Property & Casualty Operations. The Company's operations outside of Property & Casualty Operations are managed and reported in two segments: Life & Group and Corporate & Other.

Effective January 1, 2018, management changed the segment presentation of the life sciences business and technology and media related errors and omissions business within the Specialty and Commercial business segments. The life sciences business moved from the Specialty business segment to the Commercial business segment and the technology and media related errors and omissions business moved from the Commercial business segment to the Specialty business segment. The new management responsibility for these businesses better aligns with line of business underwriting expertise and the manner in which the products are sold. Prior period information has been conformed to the new segment presentation.

The accounting policies of the segments are the same as those described in Note A to the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2017. The Company manages most of its assets on a legal entity basis, while segment operations are generally conducted across legal entities. As such, only Insurance and Reinsurance receivables, Insurance reserves, Deferred acquisition costs and Goodwill are readily identifiable for individual segments. Distinct investment portfolios are not maintained for every individual segment; accordingly, allocation of assets to each segment is not performed. Therefore, a significant portion of Net investment income and Realized investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted. All significant intersegment income and expense has been eliminated. Income taxes have been allocated on the basis of the taxable income of the segments.

In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance. Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio.

The performance of the Company's insurance operations is monitored by management through core income (loss), which is derived from certain income statement amounts. The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk.

Core income (loss) is calculated by excluding from net income (loss) the after-tax effects of i) net realized investment gains (losses), ii) income or loss from discontinued operations, iii) any cumulative effects of changes in accounting guidance and iv) deferred tax asset and liability remeasurement as a result of an enacted U.S. Federal tax rate change. The calculation of core income (loss) excludes net realized investment gains or losses because net realized investment gains or losses are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations.

37

The Company's results of operations and selected balance sheet items by segment are presented in the following tables.

Three months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations		Total
Operating revenues
Net earned premiums	$	683		$	753		$	248		$	131		$	—		$	—	$	1,815
Net investment income	130			157			15			198			6			—		506
Non-insurance warranty revenue	248			—			—			—			—			—		248
Other revenues	—			8			(1		)	—			(1		)	—		6
Total operating revenues	1,061			918			262			329			5			—		2,575
Claims, benefits and expenses
Net incurred claims and benefits	372			470			166			327			(14		)	—		1,321
Policyholders’ dividends	1			5			—			—			—			—		6
Amortization of deferred acquisition costs	149			127			83			—			—			—		359
Non-insurance warranty expense	225			—			—			—			—			—		225
Other insurance related expenses	70			126			10			30			—			—		236
Other expenses	12			10			7			1			67			—		97
Total claims, benefits and expenses	829			738			266			358			53			—		2,244
Core income (loss) before income tax	232			180			(4		)	(29		)	(48		)	—		331
Income tax (expense) benefit on core income (loss)	(49		)	(37		)	(3		)	19			9			—		(61		)
Core income (loss)	$	183		$	143		$	(7	)	$	(10	)	$	(39	)	$	—	270
Net realized investment gains (losses)																		(1		)
Income tax (expense) benefit on net realized investment gains (losses)																		1
Net realized investment gains (losses), after tax																		—
Net income																		$	270

38

Three months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	678		$	716		$	206		$	135		$	—		$	(1	)	$	1,734
Net investment income	117			146			13			195			4			—			475
Non-insurance warranty revenue	98			—			—			—			—			—			98
Other revenues	—			9			(1		)	—			1			—			9
Total operating revenues	893			871			218			330			5			(1		)	2,316
Claims, benefits and expenses
Net incurred claims and benefits	394			426			129			328			(2		)	—			1,275
Policyholders’ dividends	1			4			—			—			—			—			5
Amortization of deferred acquisition costs	147			120			45			—			—			—			312
Non-insurance warranty expense	72			—			—			—			—			—			72
Other insurance related expenses	71			129			31			32			(1		)	(1		)	261
Other expenses	11			10			(1		)	1			50			—			71
Total claims, benefits and expenses	696			689			204			361			47			(1		)	1,996
Core income (loss) before income tax	197			182			14			(31		)	(42		)	—			320
Income tax (expense) benefit on core income (loss)	(66		)	(62		)	(4		)	36			15			—			(81		)
Core income (loss)	$	131		$	120		$	10		$	5		$	(27	)	$	—		239
Net realized investment gains (losses)																			50
Income tax (expense) benefit on net realized investment gains (losses)																			(17		)
Net realized investment gains (losses), after tax																			33
Net income																			$	272

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Six months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,355		$	1,496		$	484		$	265		$	—		$	—		$	3,600
Net investment income	252			306			29			398			11			—			996
Non-insurance warranty revenue	486			—			—			—			—			—			486
Other revenues	1			16			(1		)	1			—			(1		)	16
Total operating revenues	2,094			1,818			512			664			11			(1		)	5,098
Claims, benefits and expenses
Net incurred claims and benefits	751			938			308			630			27			—			2,654
Policyholders’ dividends	2			10			—			—			—			—			12
Amortization of deferred acquisition costs	294			248			113			—			—			—			655
Non-insurance warranty expense	441			—			—			—			—			—			441
Other insurance related expenses	134			253			66			60			—			—			513
Other expenses	23			21			3			3			109			(1		)	158
Total claims, benefits and expenses	1,645			1,470			490			693			136			(1		)	4,433
Core income (loss) before income tax	449			348			22			(29		)	(125		)	—			665
Income tax (expense) benefit on core income (loss)	(95		)	(72		)	(6		)	33			26			—			(114		)
Core income (loss)	$	354		$	276		$	16		$	4		$	(99	)	$	—		551
Net realized investment gains (losses)																			11
Income tax (expense) benefit on net realized investment gains (losses)																			(1		)
Net realized investment gains (losses), after tax																			10
Net income																			$	561

June 30, 2018
(In millions)
Reinsurance receivables	$	926	$	695	$	265	$	433	$	2,245	$	—		$	4,564
Insurance receivables	996		1,311		327		8		—		—			2,642
Deferred acquisition costs	317		248		108		—		—		—			673
Goodwill	117		—		30		—		—		—			147
Insurance reserves
Claim and claim adjustment expenses	5,816		8,599		1,706		3,522		2,347		—			21,990
Unearned premiums	2,103		1,608		564		136		—		(1		)	4,410
Future policy benefits	—		—		—		10,667		—		—			10,667

40

Six months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,332		$	1,377		$	403		$	268		$	—		$	(1	)	$	3,379
Net investment income	265			329			25			392			9			—			1,020
Non-insurance warranty revenue	191			—			—			—			—			—			191
Other revenues	1			18			(1		)	1			1			—			20
Total operating revenues	1,789			1,724			427			661			10			(1		)	4,610
Claims, benefits and expenses
Net incurred claims and benefits	794			849			244			658			19			—			2,564
Policyholders’ dividends	2			7			—			—			—			—			9
Amortization of deferred acquisition costs	289			237			91			—			—			—			617
Non-insurance warranty expense	142			—			—			—			—			—			142
Other insurance related expenses	138			257			58			64			(1		)	(1		)	515
Other expenses	21			25			(7		)	3			94			—			136
Total claims, benefits and expenses	1,386			1,375			386			725			112			(1		)	3,983
Core income (loss) before income tax	403			349			41			(64		)	(102		)	—			627
Income tax (expense) benefit on core income (loss)	(135		)	(118		)	(11		)	73			38			—			(153		)
Core income (loss)	$	268		$	231		$	30		$	9		$	(64	)	$	—		474
Net realized investment gains (losses)																			86
Income tax (expense) benefit on net realized investment gains (losses)																			(28		)
Net realized investment gains (losses), after tax																			58
Net income																			$	532

December 31, 2017
(In millions)
Reinsurance receivables	$	671	$	654	$	212	$	438	$	2,315	$	—	$	4,290
Insurance receivables	969		1,103		254		8		2		—		2,336
Deferred acquisition costs	318		223		93		—		—		—		634
Goodwill	117		—		31		—		—		—		148
Insurance reserves
Claim and claim adjustment expenses	5,669		8,764		1,636		3,499		2,436		—		22,004
Unearned premiums	2,020		1,409		472		128		—		—		4,029
Future policy benefits	—		—		—		11,179		—		—		11,179

41

The following table presents operating revenue by line of business for each reportable segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Specialty
Management & Professional Liability	$	627		$	620		$	1,251		$	1,258
Surety	145			136			274			260
Warranty & Alternative Risks(1)	289			137			569			271
Specialty revenues	1,061			893			2,094			1,789
Commercial
Middle Market	521			469			1,025			937
Small Business	120			126			239			222
Other Commercial Insurance	277			276			554			565
Commercial revenues	918			871			1,818			1,724
International
Canada	63			52			121			103
CNA Europe	91			79			179			151
Hardy	108			87			212			173
International revenues	262			218			512			427
Life & Group revenues	329			330			664			661
Corporate & Other revenues	5			5			11			10
Eliminations	—			(1		)	(1		)	(1		)
Total operating revenues	2,575			2,316			5,098			4,610
Net realized investment gains (losses)	(1		)	50			11			86
Total revenues	$	2,574		$	2,366		$	5,109		$	4,696

(1) As of January 1, 2018, the Company adopted ASU 2014-09 Revenue Recognition (Topic 606): Revenue from Contracts with Customers. See Note A to the Condensed Consolidated Financial Statements for additional information.

42

Note J. Non-Insurance Revenues from Contracts with Customers

Non-Insurance revenue is recognized when obligations under the terms of a contract with a customer are satisfied; generally this occurs over time as obligations are fulfilled. Revenue is measured as the amount of consideration the Company expects to receive in exchange for providing services.

Deferred Non-Insurance Warranty Revenue

Non-insurance warranty revenue is primarily generated from separately-priced service contracts that provide mechanical breakdown and other coverages to vehicle or consumer goods owners. The warranty contracts generally provide coverage from 1 month to 10 years. For warranty products in which the Company acts as the principal in the transaction, Non-insurance warranty revenues are reported on a gross basis, with amounts billed to customers reported as Non-insurance warranty revenue and commissions paid to agents reported as Non-insurance warranty expense. Non-insurance warranty revenue is reported net of any premiums related to contractual liability coverage issued by the Company's insurance operations. Additionally, the Company provides warranty administration services for dealer and manufacturer obligor warranty products, which include limited warranties and guaranteed automobile protection waivers.

The Company recognizes Non-insurance warranty revenues over the service period in proportion to the actuarially determined expected claims emergence pattern. Customers pay in full at the inception of the warranty contract. A liability for deferred revenue is recorded when cash payments are received or due in advance of the Company's performance. The deferred revenue balance includes amounts which are refundable on a pro rata basis upon cancellation.

The Company had deferred non-insurance warranty revenue balances of $2.9 billion and $3.2 billion reported in Other liabilities as of January 1, 2018 and June 30, 2018. The increase in the deferred revenue balance for the six months ended June 30, 2018 was primarily driven by cash payments received or due in advance of satisfying the Company's performance obligations, offset by cancellations and revenues recognized during the period. For the three and six months ended June 30, 2018, the Company recognized $213 million and $435 million of revenues that were included in the deferred revenue balance as of January 1, 2018. For the three and six months ended June 30, 2018, Non-insurance warranty revenue recognized from performance obligations related to prior periods due to a change in estimate was not material. The Company expects to recognize approximately $493 million of the deferred revenue in the remainder of 2018, $825 million in 2019, $656 million in 2020, and $1.2 billion thereafter.

Cost to Obtain and Fulfill Non-Insurance Warranty Contracts with Customers

Dealers, retailers and agents earn commission for assisting the Company in obtaining non-insurance warranty contracts. Additionally, the Company utilizes a third-party to perform warranty administrator services for its consumer good warranties. These costs are deferred and recorded as Other assets. These costs are amortized to Non-insurance warranty expense consistent with how the related revenue is recognized.

A premium deficiency arises to the extent that estimated future costs associated with these contracts exceed unrecognized revenue. The Company evaluates deferred costs for recoverability as part of our premium deficiency assessment. Anticipated investment income is considered in the determination of the recoverability of deferred costs. If necessary, adjustments to deferred costs and a premium deficiency reserve, if any, are recorded in current period results of operations. No premium deficiency was recognized in the six months ended June 30, 2018.

As of June 30, 2018, capitalized commission costs were $2.3 billion and capitalized administrator service costs were $19 million. For the three and six months ended June 30, 2018, the amount of amortization of capitalized costs was $164 million and $321 million and there was no impairment loss related to the costs capitalized.

43

Item 2. Management's Discussion and Analysis (MD&A) of Financial Condition and Results of Operations

OVERVIEW

The following discussion highlights significant factors affecting the Company. References to “we,” “our,” “us” or like terms refer to the business of CNA. Based on 2016 statutory net written premiums, we are the eighth largest commercial insurer in the United States of America.

The following discussion should be read in conjunction with the Condensed Consolidated Financial Statements included under Part I, Item 1 of this Form 10-Q and Item 1A Risk Factors and Item 7 Management's Discussion and Analysis of Financial Condition and Results of Operations, which are included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission for the year ended December 31, 2017.

We utilize the core income (loss) financial measure to monitor our operations. Core income (loss) is calculated by excluding from net income (loss) the after-tax effects of i) net realized investment gains or losses, ii) income or loss from discontinued operations, iii) any cumulative effects of changes in accounting guidance and iv) deferred tax asset and liability remeasurement as a result of an enacted U.S. Federal tax rate change. The calculation of core income (loss) excludes net realized investment gains or losses because net realized investment gains or losses are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations. Management monitors core income (loss) for each business segment to assess segment performance. Presentation of consolidated core income (loss) is deemed to be a non-GAAP financial measure. See further discussion regarding how we manage our business in Note I to the Condensed Consolidated Financial Statements included under Part I, Item 1. For reconciliations of non-GAAP measures to the most comparable GAAP measures and other information, please refer herein and/or to CNA's most recent 10-K on file with the Securities and Exchange Commission.

In evaluating the results of our Specialty, Commercial and International segments, we utilize the loss ratio, the expense ratio, the dividend ratio and the combined ratio. These ratios are calculated using GAAP financial results. The loss ratio is the percentage of net incurred claim and claim adjustment expenses to net earned premiums. The expense ratio is the percentage of insurance underwriting and acquisition expenses, including the amortization of deferred acquisition cost, to net earned premiums. The dividend ratio is the ratio of policyholders' dividends incurred to net earned premiums. The combined ratio is the sum of the loss, expense and dividend ratios. In addition we also utilize renewal premium change, rate, retention and new business in evaluating operating trends. Renewal premium change represents the estimated change in average premium on policies that renew, including rate and exposure changes. Rate represents the average change in price on policies that renew excluding exposure change. Exposure represents the measure of risk used in the pricing of the insurance product. Retention represents the percentage of premium dollars renewed in comparison to the expiring premium dollars from policies available to renew. Renewal premium change, rate and retention presented for the prior year are updated to reflect subsequent activity on policies written in the period. New business represents premiums from policies written with new customers and additional policies written with existing customers.

Changes in estimates of claim and claim adjustment expense reserves, net of reinsurance, for prior years are defined as net prior year loss reserve development within this MD&A. These changes can be favorable or unfavorable. Net prior year loss reserve development does not include the effect of related acquisition expenses. Further information on our reserves is provided in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

44

CRITICAL ACCOUNTING ESTIMATES

The preparation of the Condensed Consolidated Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the amount of revenues and expenses reported during the period. Actual results may differ from those estimates.

Our Condensed Consolidated Financial Statements and accompanying notes have been prepared in accordance with GAAP applied on a consistent basis. We continually evaluate the accounting policies and estimates used to prepare the Condensed Consolidated Financial Statements. In general, our estimates are based on historical experience, evaluation of current trends, information from third-party professionals and various other assumptions that are believed to be reasonable under the known facts and circumstances.

The accounting estimates below are considered by us to be critical to an understanding of our Condensed Consolidated Financial Statements as their application places the most significant demands on our judgment:

• Insurance Reserves

• Reinsurance and Insurance Receivables

• Valuation of Investments and Impairment of Securities

• Long Term Care Policies

• Income Taxes

Due to the inherent uncertainties involved with these types of judgments, actual results could differ significantly from estimates and may have a material adverse impact on our results of operations, equity, business, and insurer financial strength and corporate debt ratings. See the Critical Accounting Estimates section of our Management's Discussion and Analysis of Financial Condition and Results of Operations included under Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2017 for further information.

45

CONSOLIDATED OPERATIONS

The following table includes the consolidated results of our operations including our financial measure, Core income (loss). For more detailed components of our business operations and discussion of the core income (loss) financial measure, see the segment sections within this MD&A. For further discussion of Net investment income and Net realized investment results, see the Investments section of this MD&A.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Operating Revenues
Net earned premiums	$	1,815		$	1,734		$	3,600		$	3,379
Net investment income	506			475			996			1,020
Non-insurance warranty revenue	248			98			486			191
Other revenues	6			9			16			20
Total operating revenues	2,575			2,316			5,098			4,610
Claims, Benefits and Expenses
Net incurred claims and benefits	1,321			1,275			2,654			2,564
Policyholders' dividends	6			5			12			9
Amortization of deferred acquisition costs	359			312			655			617
Other insurance related expenses	236			261			513			515
Non-insurance warranty expense	225			72			441			142
Other expenses	97			71			158			136
Total claims, benefits and expenses	2,244			1,996			4,433			3,983
Core income before income tax	331			320			665			627
Income tax expense on core income	(61		)	(81		)	(114		)	(153		)
Core income	270			239			551			474
Net realized investment (losses) gains	(1		)	50			11			86
Income tax benefit (expense) on net realized investment (losses) gains	1			(17		)	(1		)	(28		)
Net realized investment gains, after tax	—			33			10			58
Net income	$	270		$	272		$	561		$	532

Three Month Comparison

Core income increased $31 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change, core income for our Property & Casualty Operations increased approximately $3 million primarily due to higher net investment income driven by higher limited partnership returns. Excluding the unfavorable effect of the Federal corporate income tax rate change which reduced the income tax benefit, core income for our Life & Group segment was consistent with the prior period while core loss for our Corporate & Other segment increased approximately $5 million.

Pretax net catastrophe losses were $26 million and $39 million for the three months ended June 30, 2018 and 2017. Favorable net prior year loss reserve development of $59 million and $55 million was recorded in the three months ended June 30, 2018 and 2017 related to our Specialty, Commercial, International and Corporate & Other segments. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

46

Six Month Comparison

Core income increased $77 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change, core income for our Property & Casualty Operations increased approximately $7 million due to improved underwriting results partially offset by lower net investment income driven by lower limited partnership returns. Excluding the unfavorable effect of the Federal corporate income tax rate change, core income for our Life & Group segment increased approximately $23 million while core loss for our Corporate & Other segment increased approximately $17 million.

Pretax net catastrophe losses were $60 million and $73 million for the six months ended June 30, 2018 and 2017. Favorable net prior year loss reserve development of $98 million and $112 million was recorded in the six months ended June 30, 2018 and 2017 related to our Specialty, Commercial, International and Corporate & Other segments. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

47

SEGMENT RESULTS

The following discusses the results of operations for our business segments. Our property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International, which we refer to collectively as Property & Casualty Operations. Our operations outside of Property & Casualty Operations are managed and reported in two segments: Life & Group and Corporate & Other.

48

Specialty

The following table details the results of operations for Specialty.

Periods ended June 30	Three Months						Six Months
(In millions, except ratios, rate, renewal premium change and retention)	2018			2017			2018			2017
Net written premiums	$	688		$	701		$	1,374		$	1,371
Net earned premiums	683			678			1,355			1,332
Net investment income	130			117			252			265
Core income	183			131			354			268
Other performance metrics:
Loss and loss adjustment expense ratio	54.6		%	58.1		%	55.4		%	59.6		%
Expense ratio	32.0			32.0			31.6			32.0
Dividend ratio	0.2			0.2			0.2			0.1
Combined ratio	86.8		%	90.3		%	87.2		%	91.7		%
Rate	2		%	1		%	2		%	1		%
Renewal premium change	4			3			3			4
Retention	82			89			84			88
New business	$	92		$	62		$	173		$	117

Three Month Comparison

Net written premiums for Specialty decreased $13 million for the three months ended June 30, 2018 as compared with the same period in 2017 driven by a higher level of ceded reinsurance to support growth in management liability and lower retention partially offset by higher new business and positive renewal premium change. The increase in net earned premiums was consistent with the trend in net written premiums in recent quarters.

Core income increased $52 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change, core income increased approximately $21 million due to improved underwriting results and higher net investment income driven by higher limited partnership returns.

The combined ratio improved 3.5 points for the three months ended June 30, 2018 as compared with the same period in 2017. The loss ratio improved 3.5 points primarily due to higher favorable net prior year loss reserve development and an improved current accident year loss ratio. Net catastrophe losses were $3 million, or 0.5 points of the loss ratio, for the three months ended June 30, 2018, as compared to $5 million, or 0.9 points of the loss ratio, for the three months ended June 30, 2017. The expense ratio for the three months ended June 30, 2018 was consistent with the same period in 2017.

Favorable net prior year loss reserve development of $44 million and $23 million was recorded for the three months ended June 30, 2018 and 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

49

Six Month Comparison

Net written premiums for Specialty increased $3 million for the six months ended June 30, 2018 as compared with the same period in 2017 driven by higher new business and positive renewal premium change partially offset by a higher level of ceded reinsurance to support growth in management liability and lower retention. The increase in net earned premiums was consistent with the trend in net written premiums.

Core income increased $86 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change, core income increased approximately $27 million due to improved underwriting results driven by higher favorable net prior year loss reserve development.

The combined ratio improved 4.5 points for the six months ended June 30, 2018 as compared with the same period in 2017. The loss ratio improved 4.2 points primarily due to higher favorable net prior year loss reserve development and an improved current accident year loss ratio. Net catastrophe losses were $6 million, or 0.5 points of the loss ratio, for the six months ended June 30, 2018, as compared to $9 million, or 0.7 points of the loss ratio, for the six months ended June 30, 2017. The expense ratio decreased 0.4 points for the six months ended June 30, 2018 as compared with the same period in 2017 driven by lower IT spend.

Favorable net prior year loss reserve development of $74 million and $35 million was recorded for the six months ended June 30, 2018 and 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

The following table summarizes the gross and net carried reserves for Specialty.

(In millions)	June 30, 2018		December 31, 2017
Gross case reserves	$	1,694	$	1,742
Gross IBNR reserves	4,122		3,927
Total gross carried claim and claim adjustment expense reserves	$	5,816	$	5,669
Net case reserves	$	1,539	$	1,600
Net IBNR reserves	3,364		3,407
Total net carried claim and claim adjustment expense reserves	$	4,903	$	5,007

50

Commercial

The following table details the results of operations for Commercial.

Periods ended June 30	Three Months						Six Months
(In millions, except ratios, rate, renewal premium change and retention)	2018			2017			2018			2017
Net written premiums	$	810		$	782		$	1,642		$	1,506
Net earned premiums	753			716			1,496			1,377
Net investment income	157			146			306			329
Core income	143			120			276			231
Other performance metrics:
Loss and loss adjustment expense ratio	62.4		%	59.6		%	62.7		%	61.7		%
Expense ratio	33.5			34.4			33.4			35.8
Dividend ratio	0.7			0.6			0.7			0.5
Combined ratio	96.6		%	94.6		%	96.8		%	98.0		%
Rate	1		%	0		%	1		%	0		%
Renewal premium change	4			3			3			3
Retention	85			86			85			86
New business	$	157		$	154		$	338		$	294

Three Month Comparison

Net written premiums for Commercial were $28 million higher for the three months ended June 30, 2018 as compared with the same period in 2017 driven by positive renewal premium change and higher new business. The increase in net earned premiums was consistent with the trend in net written premiums.

Core income increased $23 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change, core income decreased approximately $2 million due to lower favorable net prior year loss reserve development partially offset by higher net investment income driven by improved limited partnership returns.

The combined ratio increased 2.0 points for the three months ended June 30, 2018 as compared with the same period in 2017. The loss ratio increased 2.8 points driven by lower favorable net prior year loss reserve development and a higher number of large property losses. Net catastrophe losses were $19 million, or 2.5 points of the loss ratio, for the three months ended June 30, 2018, as compared to $35 million, or 4.7 points of the loss ratio, for the three months ended June 30, 2017. The expense ratio improved 0.9 points for the three months ended June 30, 2018 as compared with the same period in 2017 driven by lower IT spend, lower employee costs and higher net earned premiums.

Favorable net prior year loss reserve development of $13 million and $34 million was recorded for the three months ended June 30, 2018 and 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

51

Six Month Comparison

Net written premiums for Commercial were $136 million higher for the six months ended June 30, 2018 as compared with the same period in 2017. The prior period included an unfavorable premium rate adjustment in Small Business which affected both net written premiums and net earned premiums as more fully discussed in Note F to the Condensed Consolidated Financial Statements under Part 1, Item 1. Excluding the Small Business premium rate adjustment, net written premiums increased $90 million driven by higher new business and positive renewal premium change. The increase in net earned premiums was consistent with the trend in net written premiums.

Core income increased $45 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the favorable effect of the Federal corporate income tax rate change and the unfavorable Small Business premium rate adjustment in the prior period, core income decreased approximately $27 million due to lower favorable net prior year loss reserve development.

Excluding the impact of the Small Business premium rate adjustment, the combined ratio increased 1.3 points, driven by 4.1 points of less favorable net prior year loss reserve development. This was largely offset by a 1.4 point improvement in the current accident year loss ratio and a 1.6 point decrease in the expense ratio driven by higher net earned premiums and lower IT spend and employee costs. Net catastrophe losses were $48 million, or 3.2 points of the loss ratio, for the six months ended June 30, 2018, as compared to $62 million, or 4.3 points of the loss ratio, for the six months ended June 30, 2017.

Favorable net prior year loss reserve development of $22 million and $77 million was recorded for the six months ended June 30, 2018 and 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

The following table summarizes the gross and net carried reserves for Commercial.

(In millions)	June 30, 2018		December 31, 2017
Gross case reserves	$	4,227	$	4,427
Gross IBNR reserves	4,372		4,337
Total gross carried claim and claim adjustment expense reserves	$	8,599	$	8,764
Net case reserves	$	3,906	$	4,103
Net IBNR reserves	4,043		4,033
Total net carried claim and claim adjustment expense reserves	$	7,949	$	8,136

52

International

The following table details the results of operations for International.

Periods ended June 30	Three Months						Six Months
(In millions, except ratios, rate, renewal premium change and retention)	2018			2017			2018			2017
Net written premiums	$	271		$	219		$	566		$	457
Net earned premiums	248			206			484			403
Net investment income	15			13			29			25
Core (loss) income	(7		)	10			16			30
Other performance metrics:
Loss and loss adjustment expense ratio	66.8		%	62.8		%	63.7		%	60.6		%
Expense ratio	37.9			37.3			37.1			37.1
Combined ratio	104.7		%	100.1		%	100.8		%	97.7		%
Rate	3		%	0		%	3		%	0		%
Renewal premium change	8			3			6			2
Retention	73			82			78			80
New business	$	83		$	73		$	176		$	138

Three Month Comparison

Net written premiums for International increased $52 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the effect of foreign currency exchange rates, net written premiums increased $42 million or 19% for the three months ended June 30, 2018 as compared with the same period in 2017 driven by positive renewal premium change and higher new business. The increase in net earned premiums wasconsistent with the trend in net written premiums.

Core results decreased $17 million for the three months ended June 30, 2018 as compared with the same period in 2017 driven by lower underwriting results. The effect of the Federal corporate income tax rate change was not significant.

The combined ratio increased 4.6 points for the three months ended June 30, 2018 as compared with the same period in 2017. The loss ratio increased 4.0 points, primarily due to a higher current accident year loss ratio driven by a higher number of large property losses mainly in Canada. Net catastrophe losses were $4 million, or 1.6 points of the loss ratio, for the three months ended June 30, 2018. There were no net catastrophe losses for the three months ended June 30, 2017. The expense ratio increased 0.6 points for the three months ended June 30, 2018 as compared with the same period in 2017 driven by higher acquisition expenses.

Favorable net prior year loss reserve development of $2 million was recorded for the three months ended June 30, 2018 as compared with unfavorable net prior year loss reserve development of $2 million for the three months ended June 30, 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

53

Six Month Comparison

Net written premiums for International increased $109 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the effect of foreign currency exchange rates, net written premiums increased $79 million or 16% for the six months ended June 30, 2018 as compared with the same period in 2017 driven by positive renewal premium change and higher new business. The increase in net earned premiums wasconsistent with the trend in net written premiums.

Core income decreased $14 million for the six months ended June 30, 2018 as compared with the same period in 2017 driven by lower underwriting results. The effect of the Federal corporate income tax rate change was not significant.

The combined ratio increased 3.1 points for the six months ended June 30, 2018 as compared with the same period in 2017. The loss ratio increased 3.1 points, primarily due to a higher current accident year loss ratio driven by a higher number of large property losses mainly in Canada and attritional losses in the U.K. Net catastrophe losses were $6 million, or 1.3 points of the loss ratio, for the six months ended June 30, 2018, as compared to $2 million, or 0.6 points of the loss ratio, for the six months ended June 30, 2017. The expense ratio was consistent for the six months ended June 30, 2018 and 2017.

Favorable net prior year loss reserve development of $2 million and nil was recorded for the six months ended June 30, 2018 and 2017. Further information on net prior year loss reserve development is in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

The following table summarizes the gross and net carried reserves for International.

(In millions)	June 30, 2018		December 31, 2017
Gross case reserves	$	831	$	744
Gross IBNR reserves	875		892
Total gross carried claim and claim adjustment expense reserves	$	1,706	$	1,636
Net case reserves	$	674	$	640
Net IBNR reserves	780		792
Total net carried claim and claim adjustment expense reserves	$	1,454	$	1,432

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Life & Group

The following table details the results of operations for Life & Group.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net earned premiums	$	131		$	135		$	265		$	268
Net investment income	198			195			398			392
Core loss before income tax	(29		)	(31		)	(29		)	(64		)
Income tax benefit on core loss	19			36			33			73
Core (loss) income	(10		)	5			4			9

Three Month Comparison

Core results decreased $15 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the unfavorable effect of the Federal corporate income tax rate change, core income was consistent with the prior period. Morbidity continues to trend in line with expectations. Persistency continues to benefit from a high proportion of policyholders choosing to reduce benefits in lieu of premium rate increases. However, the favorable persistency trend was offset this quarter when a significant number of policies converted to a fully paid-up status with modest future benefits following the termination of a large group account. The reserves associated with these converted policies were, on average, slightly higher than the previously recorded carried reserves, resulting in a negative financial impact for the three months ended June 30, 2018.

Six Month Comparison

Core income decreased $5 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the unfavorable effect of the Federal corporate income tax rate change, core income increased approximately $23 million. While the drivers of core income for the six month period were generally consistent with the three month summary noted above, the favorability driven by policyholders choosing to reduce benefits in lieu of premium rate increases was greater because the trend positively impacted both quarters in the six month period.

55

Corporate & Other

The following table details the results of operations for Corporate & Other.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net investment income	$	6		$	4		$	11		$	9
Interest expense	34			39			68			77
Core loss	(39		)	(27		)	(99		)	(64		)

Three Month Comparison

Core loss increased $12 million for the three months ended June 30, 2018 as compared with the same period in 2017. Excluding the unfavorable effect of the Federal corporate income tax rate change, core loss increased approximately $5 million driven by non-recurring costs of $23 million associated with the transition to a new IT infrastructure service provider. This was partially offset by a higher recognition of retroactive reinsurance deferred gain on the LPT due to higher net A&EP claim payments, as compared to the prior year period. The LPT is further discussed in Note E to the Condensed Consolidated Financial Statements included under Part I, Item 1.

Six Month Comparison

Core loss increased $35 million for the six months ended June 30, 2018 as compared with the same period in 2017. Excluding the unfavorable effect of the Federal corporate income tax rate change, core loss increased approximately $17 million driven by non-recurring costs of $23 million associated with the transition to a new IT infrastructure service provider and higher adverse net prior year reserve development recorded in 2018 for A&EP under the LPT, as compared to the prior year period.

The following table summarizes the gross and net carried reserves for Corporate & Other.

(In millions)	June 30, 2018		December 31, 2017
Gross case reserves	$	1,199	$	1,371
Gross IBNR reserves	1,148		1,065
Total gross carried claim and claim adjustment expense reserves	$	2,347	$	2,436
Net case reserves	$	92	$	94
Net IBNR reserves	109		111
Total net carried claim and claim adjustment expense reserves	$	201	$	205

56

INVESTMENTS

Net Investment Income

The significant components of Net investment income are presented in the following table. Fixed income securities, as presented, include both fixed maturity and non-redeemable preferred stock.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Fixed income securities:
Taxable fixed income securities	$	354		$	353		$	704		$	701
Tax-exempt fixed income securities	100			106			205			214
Total fixed income securities	454			459			909			915
Limited partnership and common stock investments	42			16			73			106
Other, net of investment expense	10			—			14			(1		)
Pretax net investment income	$	506		$	475		$	996		$	1,020
Fixed income securities, after tax	$	375		$	333		$	752		$	664
Net investment income, after tax	416			344			821			733
Effective income yield for the fixed income securities portfolio, pretax	4.7		%	4.8		%	4.7		%	4.8		%
Effective income yield for the fixed income securities portfolio, after tax	3.9		%	3.4		%	3.9		%	3.4		%

Pretax net investment income increased $31 million for the three months ended June 30, 2018 as compared with the same period in 2017. The increase was driven by limited partnership and common stock investments, which returned 1.8% in 2018 as compared with 0.7% in the prior year period. Net investment income, after tax, increased $72 million for the three months ended June 30, 2018 as compared with the same period in 2017 driven by the lower Federal corporate income tax rate and higher limited partnership returns.

Pretax net investment income decreased $24 million for the six months ended June 30, 2018 as compared with the same period in 2017. The decrease was driven by limited partnership and common stock investments, which returned 3.0% in 2018 as compared with 4.5% in the prior year period. However, despite the decline in limited partnership income, net investment income, after tax, increased $88 million for the six months ended June 30, 2018 as compared with the same period in 2017 driven by the lower Federal corporate income tax rate.

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Net Realized Investment Gains (Losses)

The components of Net realized investment results are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Fixed maturity securities:
Corporate bonds and other	$	9		$	41		$	28		$	71
States, municipalities and political subdivisions	6			4			26			10
Asset-backed	(11		)	(1		)	(32		)	(5		)
Total fixed maturity securities	4			44			22			76
Non-redeemable preferred stock	(10		)	—			(25		)	—
Short term and other	5			6			14			10
Net realized investment (losses) gains	(1		)	50			11			86
Income tax benefit (expense) on net realized investment (losses) gains	1			(17		)	(1		)	(28		)
Net realized investment gains, after tax	$	—		$	33		$	10		$	58

Pretax net realized investment results decreased $51 million for the three months ended June 30, 2018 as compared with the same period in 2017. The decrease was driven by lower net realized gains on sales of securities and the decline in fair value of non-redeemable preferred stock.

Pretax net realized investment gains decreased $75 million for the six months ended June 30, 2018 as compared with the same period in 2017. The decrease was driven by lower net realized gains on sales of securities and the decline in fair value of non-redeemable preferred stock.

Further information on our realized gains and losses, including our OTTI losses, is set forth in Note C to the Condensed Consolidated Financial Statements included under Part I, Item 1.

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Portfolio Quality

The following table presents the estimated fair value and net unrealized gains (losses) of our fixed maturity securities by rating distribution.

	June 30, 2018					December 31, 2017
(In millions)	Estimated Fair Value		Net Unrealized Gains (Losses)			Estimated Fair Value		Net Unrealized Gains (Losses)
U.S. Government, Government agencies and Government-sponsored enterprises	$	4,392	$	(60	)	$	4,514	$	21
AAA	3,129		256			1,954		152
AA	6,868		538			8,982		914
A	8,914		618			9,643		952
BBB	13,643		461			13,554		1,093
Non-investment grade	2,849		54			2,840		140
Total	$	39,795	$	1,867		$	41,487	$	3,272

As of June 30, 2018 and December 31, 2017, 3% and 2% of our fixed maturity portfolio was rated internally.

The following table presents available-for-sale fixed maturity securities in a gross unrealized loss position by ratings distribution.

	June 30, 2018
(In millions)	Estimated Fair Value		Gross Unrealized Losses
U.S. Government, Government agencies and Government-sponsored enterprises	$	3,380	$	84
AAA	411		10
AA	830		11
A	2,155		44
BBB	5,608		159
Non-investment grade	1,111		38
Total	$	13,495	$	346

The following table presents the maturity profile for these available-for-sale fixed maturity securities. Securities not due to mature on a single date are allocated based on weighted average life.

	June 30, 2018
(In millions)	Estimated Fair Value		Gross Unrealized Losses
Due in one year or less	$	112	$	7
Due after one year through five years	2,198		32
Due after five years through ten years	9,532		254
Due after ten years	1,653		53
Total	$	13,495	$	346

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Duration

A primary objective in the management of the investment portfolio is to optimize return relative to corresponding liabilities and respective liquidity needs. Our views on the current interest rate environment, tax regulations, asset class valuations, specific security issuer and broader industry segment conditions and domestic and global economic conditions, are some of the factors that enter into an investment decision. We also continually monitor exposure to issuers of securities held and broader industry sector exposures and may from time to time adjust such exposures based on our views of a specific issuer or industry sector.

A further consideration in the management of the investment portfolio is the characteristics of the corresponding liabilities and the ability to align the duration of the portfolio to those liabilities and to meet future liquidity needs, minimize interest rate risk and maintain a level of income sufficient to support the underlying insurance liabilities. For portfolios where future liability cash flows are determinable and typically long term in nature, we segregate investments for asset/liability management purposes. The segregated investments support the long term care and structured settlement liabilities in the Life & Group segment.

The effective durations of fixed income securities and short term investments are presented in the following table. Amounts presented are net of payable and receivable amounts for securities purchased and sold, but not yet settled.

	June 30, 2018			December 31, 2017
(In millions)	Estimated Fair Value		Effective Duration (In years)	Estimated Fair Value		Effective Duration (In years)
Investments supporting Life & Group	$	16,260	8.2	$	16,797	8.4
Other investments	25,339		4.5	26,817		4.4
Total	$	41,599	5.9	$	43,614	5.9

The duration of the total portfolio is aligned with the cash flow characteristics of the underlying liabilities.

The investment portfolio is periodically analyzed for changes in duration and related price risk. Additionally, we periodically review the sensitivity of the portfolio to the level of foreign exchange rates and other factors that contribute to market price changes. A summary of these risks and specific analysis on changes is included in the Quantitative and Qualitative Disclosures About Market Risk included under Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2017.

Short Term Investments

The carrying value of the components of the Short term investments are presented in the following table.

(In millions)	June 30, 2018		December 31, 2017
Short term investments:
Commercial paper	$	1,019	$	905
U.S. Treasury securities	133		355
Money market funds	37		44
Other	119		132
Total short term investments	$	1,308	$	1,436

60

LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

Our primary operating cash flow sources are premiums and investment income from our insurance subsidiaries. Our primary operating cash flow uses are payments for claims, policy benefits and operating expenses, including interest expense on corporate debt. Additionally, cash may be paid or received for income taxes.

For the six months ended June 30, 2018, net cash provided by operating activities was $354 million as compared with $515 million for the same period in 2017. The decrease in cash provided by operating activities was driven by a lower level of distributions on limited partnerships and higher net claim payments.

Cash flows from investing activities include the purchase and disposition of available-for-sale financial instruments and may include the purchase and sale of businesses, land, buildings, equipment and other assets not generally held for resale.

Net cash provided by investing activities was $439 million for the six months ended June 30, 2018, as compared with $111 million for the same period in 2017. The cash flow from investing activities is affected by various factors such as the anticipated payment of claims, financing activity, asset/liability management and individual security buy and sell decisions made in the normal course of portfolio management.

Cash flows from financing activities may include proceeds from the issuance of debt and equity securities, outflows for stockholder dividends or repayment of debt and outlays to reacquire equity securities.

For the six months ended June 30, 2018, net cash used by financing activities was $855 million as compared with $677 million for the same period in 2017. In the first quarter of 2018, we redeemed the $150 million outstanding aggregate principal balance of our 6.950% senior notes due January 15, 2018.

Common Stock Dividends

Dividends of $2.60 per share on our common stock, including a special dividend of $2.00 per share, were declared and paid during the six months ended June 30, 2018. On July 27, 2018, our Board of Directors declared a quarterly dividend of $0.35 per share, payable August 29, 2018 to stockholders of record on August 13, 2018. The declaration and payment of future dividends to holders of our common stock will be at the discretion of our Board of Directors and will depend on many factors, including our earnings, financial condition, business needs and regulatory constraints.

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Liquidity

Later this year, management intends to pay down the $30 million of subordinated variable rate debt of Hardy due September 15, 2036. We believe that our present cash flows from operating, investing and financing activities are sufficient to fund our current and expected working capital and debt obligation needs and we do not expect this to change in the near term. There are currently no amounts outstanding under our $250 million senior unsecured revolving credit facility and no borrowings outstanding through our membership in the FHLBC.

Dividends from CCC are subject to the insurance holding company laws of the State of Illinois, the domiciliary state of CCC. Under these laws, ordinary dividends, or dividends that do not require prior approval by the Illinois Department of Insurance (the Department), are determined based on the greater of the prior year's statutory net income or 10% of statutory surplus as of the end of the prior year, as well as timing and amount of dividends paid in the preceding twelve months. Additionally, ordinary dividends may only be paid from earned surplus, which is calculated by removing unrealized gains from unassigned surplus. As of June 30, 2018 CCC was in a positive earned surplus position. The maximum allowable dividend CCC could pay during 2018 that would not be subject to the Department's prior approval is $1,073 million, less dividends paid during the preceding twelve months measured at that point in time. CCC paid dividends of $180 million during the six months ended December 31, 2017 and $770 million during the six months ended June 30, 2018. As of June 30, 2018 CCC is able to pay approximately $123 million of dividends that would not be subject to prior approval of the Department. The actual level of dividends paid in any year is determined after an assessment of available dividend capacity, holding company liquidity and cash needs as well as the impact the dividends will have on the statutory surplus of the applicable insurance company.

We have an effective automatic shelf registration statement under which we may publicly issue debt, equity or hybrid securities from time to time.

62

ACCOUNTING STANDARDS UPDATE

For a discussion of Accounting Standards Updates adopted in the current period and that will be adopted in the future, see Note A to the Condensed Consolidated Financial Statements included under Part I, Item 1.

FORWARD-LOOKING STATEMENTS

This report contains a number of forward-looking statements which relate to anticipated future events rather than actual present conditions or historical events. These statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and generally include words such as “believes,” “expects,” “intends,” “anticipates,” “estimates” and similar expressions. Forward-looking statements in this report include any and all statements regarding expected developments in our insurance business, including losses and loss reserves for A&EP and other mass tort claims which are more uncertain, and therefore more difficult to estimate than loss reserves respecting traditional property and casualty exposures; the impact of routine ongoing insurance reserve reviews we are conducting; our expectations concerning our revenues, earnings, expenses and investment activities; volatility in investment returns; expected cost savings and other results from our expense reduction activities; and our proposed actions in response to trends in our business. Forward-looking statements, by their nature, are subject to a variety of inherent risks and uncertainties that could cause actual results to differ materially from the results projected in the forward-looking statement. We cannot control many of these risks and uncertainties. These risks and uncertainties include, but are not limited to, the following:

Company-Specific Factors

• the risks and uncertainties associated with our insurance reserves, as outlined in the Critical Accounting Estimates and the Reserves - Estimates and Uncertainties sections of our Annual Report on Form 10-K, including the sufficiency of the reserves and the possibility for future increases, which would be reflected in the results of operations in the period that the need for such adjustment is determined;

• the risk that the other parties to the transaction in which, subject to certain limitations, we ceded our legacy A&EP liabilities will not fully perform their obligations to CNA, the uncertainty in estimating loss reserves for A&EP liabilities and the possible continued exposure of CNA to liabilities for A&EP claims that are not covered under the terms of the transaction;

• the performance of reinsurance companies under reinsurance contracts with us; and

• the risks and uncertainties associated with potential acquisitions and divestitures, including the consummation of such transactions, the successful integration of acquired operations and the potential for subsequent impairment of goodwill or intangible assets.

Industry and General Market Factors

• the impact of competitive products, policies and pricing and the competitive environment in which we operate, including changes in our book of business;

• product and policy availability and demand and market responses, including the level of ability to obtain rate increases and decline or non-renew underpriced accounts, to achieve premium targets and profitability and to realize growth and retention estimates;

• general economic and business conditions, including recessionary conditions that may decrease the size and number of our insurance customers and create additional losses to our lines of business, especially those that provide management and professional liability insurance, as well as surety bonds, to businesses engaged in real estate, financial services and professional services and inflationary pressures on medical care costs, construction costs and other economic sectors that increase the severity of claims;

• conditions in the capital and credit markets, including continuing uncertainty and instability in these markets, as well as the overall economy, and their impact on the returns, types, liquidity and valuation of our investments;

• conditions in the capital and credit markets that may limit our ability to raise significant amounts of capital on favorable terms; and

• the possibility of changes in our ratings by ratings agencies, including the inability to access certain markets or distribution channels and the required collateralization of future payment obligations as a result of such changes, and changes in rating agency policies and practices.

63

Regulatory Factors

• regulatory initiatives and compliance with governmental regulations, judicial interpretations within the regulatory framework, including interpretation of policy provisions, decisions regarding coverage and theories of liability, legislative actions that increase claimant activity, trends in litigation and the outcome of any litigation involving us and rulings and changes in tax laws and regulations;

• regulatory limitations, impositions and restrictions upon us, including with respect to our ability to increase premium rates, and the effects of assessments and other surcharges for guaranty funds and second-injury funds, other mandatory pooling arrangements and future assessments levied on insurance companies; and

• regulatory limitations and restrictions, including limitations upon our ability to receive dividends from our insurance subsidiaries, imposed by regulatory authorities, including regulatory capital adequacy standards.

Impact of Catastrophic Events and Related Developments

• weather and other natural physical events, including the severity and frequency of storms, hail, snowfall and other winter conditions, natural disasters such as hurricanes and earthquakes, as well as climate change, including effects on global weather patterns, greenhouse gases, sea, land and air temperatures, sea levels, rain, hail and snow;

• regulatory requirements imposed by coastal state regulators in the wake of hurricanes or other natural disasters, including limitations on the ability to exit markets or to non-renew, cancel or change terms and conditions in policies, as well as mandatory assessments to fund any shortfalls arising from the inability of quasi-governmental insurers to pay claims;

• man-made disasters, including the possible occurrence of terrorist attacks, the unpredictability of the nature, targets, severity or frequency of such events, and the effect of the absence or insufficiency of applicable terrorism legislation on coverages; and

• the occurrence of epidemics.

Referendum on the United Kingdom's Membership in the European Union

• in 2016, the United Kingdom (U.K.) held a referendum in which voters approved an exit from the European Union (E.U.), commonly referred to as "Brexit." As a result of the referendum, in 2017 the British government formally commenced the process to leave the E.U. and began negotiating the terms of treaties that will govern the U.K.'s future relationship with the E.U. Although the terms of any future treaties are unknown, we believe changes in our international operating platform will be required to allow us to continue to write business in the E.U. after the completion of Brexit. Therefore, we have begun the process of establishing a new European subsidiary in Luxembourg. As a result of these changes, the complexity and cost of regulatory compliance of our European business is likely to increase.

Our forward-looking statements speak only as of the date of the filing of this Quarterly Report on Form 10-Q and we do not undertake any obligation to update or revise any forward-looking statement to reflect events or circumstances after the date of the statement, even if our expectations or any related events or circumstances change.

64

Item 3. Quantitative and Qualitative Disclosures About Market Risk

There were no material changes in our market risk components for the six months ended June 30, 2018. See the Quantitative and Qualitative Disclosures About Market Risk included in Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2017 for further information. Additional information related to portfolio duration is discussed in the Investments section of our Management’s Discussion and Analysis of Financial Condition and Results of Operations included in Part I, Item 2.

Item 4. Controls and Procedures

The Company maintains a system of disclosure controls and procedures which are designed to ensure that information required to be disclosed by the Company in reports that it files or submits to the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), including this report, is recorded, processed, summarized and reported on a timely basis. These disclosure controls and procedures include controls and procedures designed to ensure that information required to be disclosed under the Exchange Act is accumulated and communicated to the Company's management on a timely basis to allow decisions regarding required disclosure.

As of June 30, 2018, the Company's management, including the Company's Chief Executive Officer (CEO) and Chief Financial Officer (CFO), conducted an evaluation of the effectiveness of the Company's disclosure controls and procedures (as such term is defined in Exchange Act Rules 13a-15(e) and 15d-15(e)). Based on this evaluation, the CEO and CFO have concluded that the Company's disclosure controls and procedures are effective as of June 30, 2018.

There has been no change in the Company’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended June 30, 2018 that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

65

PART II. Other Information

Item 1. Legal Proceedings

Information on our legal proceedings is set forth in Note F to the Condensed Consolidated Financial Statements included under Part I, Item 1.

Item 6. Exhibits

See Exhibit Index.

66

SIGNATURES

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.

		CNA Financial Corporation
Dated: July 30, 2018	By	/s/ D. Craig Mense
		D. Craig Mense Executive Vice President and Chief Financial Officer (Duly authorized officer and principal financial officer)

67

EXHIBIT INDEX

Description of Exhibit	Exhibit Number
Certification of Chief Executive Officer	31.1
Certification of Chief Financial Officer	31.2
Written Statement of the Chief Executive Officer of CNA Financial Corporation Pursuant to 18 U.S.C. Section 1350 (As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)	32.1
Written Statement of the Chief Financial Officer of CNA Financial Corporation Pursuant to 18 U.S.C. Section 1350 (As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)	32.2
XBRL Instance Document	101.INS
XBRL Taxonomy Extension Schema	101.SCH
XBRL Taxonomy Extension Calculation Linkbase	101.CAL
XBRL Taxonomy Extension Definition Linkbase	101.DEF
XBRL Taxonomy Label Linkbase	101.LAB
XBRL Taxonomy Extension Presentation Linkbase	101.PRE

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EX-31.1

EXHIBIT 31.1

SARBANES-OXLEY ACT SECTION 302

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Dino E. Robusto, certify that:

1. I have reviewed this quarterly report on Form 10-Q of CNA Financial Corporation;

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 officers 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 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 officers 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated:	July 30, 2018	By	/s/ Dino E. Robusto
			Dino E. Robusto
			Chief Executive Officer

EX-31.2

EXHIBIT 31.2

SARBANES-OXLEY ACT SECTION 302

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, D. Craig Mense, certify that:

1. I have reviewed this quarterly report on Form 10-Q of CNA Financial Corporation;

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 officers 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 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 officers 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated:	July 30, 2018	By	/s/ D. Craig Mense
			D. Craig Mense
			Chief Financial Officer

EX-32.1

EXHIBIT 32.1

Written Statement of the Chief Executive Officer

of CNA Financial Corporation

Pursuant to 18 U.S.C. § 1350

(As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

The undersigned, the Chief Executive Officer of CNA Financial Corporation (the Company), hereby certifies that, to his knowledge:

• the Company’s quarterly report on Form 10-Q for the quarter ended June 30, 2018 filed on the date hereof with the Securities and Exchange Commission (the Report) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Dated:	July 30, 2018	By	/s/ Dino E. Robusto
			Dino E. Robusto
			Chief Executive Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Report or as a separate disclosure document.

EX-32.2

EXHIBIT 32.2

Written Statement of the Chief Financial Officer

of CNA Financial Corporation

Pursuant to 18 U.S.C. § 1350

(As adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

The undersigned, the Chief Financial Officer of CNA Financial Corporation (the Company), hereby certifies that, to his knowledge:

• the Company’s quarterly report on Form 10-Q for the quarter ended June 30, 2018 filed on the date hereof with the Securities and Exchange Commission (the Report) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Dated:	July 30, 2018	By	/s/ D. Craig Mense
			D. Craig Mense
			Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Report or as a separate disclosure document.

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Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2018	Jul. 26, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	CNA FINANCIAL CORP
Entity Central Index Key	0000021175
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		271,395,494

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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Net earned premiums	$ 1,815	$ 1,734	$ 3,600	$ 3,379
Net investment income	506	475	996	1,020
Net realized investment (losses) gains:
Other-than-temporary impairment losses	0	(2)	(6)	(4)
Other net realized investment (losses) gains	(1)	52	17	90
Net realized investment (losses) gains	(1)	50	11	86
Non-insurance warranty revenue (Note J)	248	98	486	191
Other revenues	6	9	16	20
Total revenues	2,574	2,366	5,109	4,696
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	1,327	1,280	2,666	2,573
Amortization of deferred acquisition costs	359	312	655	617
Non-insurance warranty expense (Note J)	225	72	441	142
Other operating expenses	298	292	601	568
Interest	35	40	70	83
Total claims, benefits and expenses	2,244	1,996	4,433	3,983
Income before income tax	330	370	676	713
Income tax expense	(60)	(98)	(115)	(181)
Net income	$ 270	$ 272	$ 561	$ 532
Basic earnings per share (in usd per share)	$ 0.99	$ 1.01	$ 2.07	$ 1.96
Diluted earnings per share (in usd per share)	0.99	1.00	2.06	1.96
Dividends declared per share (in usd per share)	$ 0.30	$ 0.25	$ 2.6	$ 2.5
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic (in shares)	271.5	271.1	271.5	271.0
Diluted (in shares)	272.4	271.9	272.4	271.9

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 270	$ 272	$ 561	$ 532
Changes in:
Net unrealized gains on investments with other-than-temporary impairments	(1)	0	(10)	(4)
Net unrealized gains on other investments	(159)	77	(588)	144
Net unrealized gains on investments	(160)	77	(598)	140
Foreign currency translation adjustment	(52)	42	(40)	53
Pension and postretirement benefits	7	5	17	12
Other comprehensive (loss) income, net of tax	(205)	124	(621)	205
Total comprehensive income (loss)	$ 65	$ 396	$ (60)	$ 737

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Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	$ 39,795	$ 41,487
Equity securities at fair value (cost of $762 and $659)	773
Equity securities at fair value (cost of $762 and $659)		695
Limited partnership investments	2,363	2,369
Other invested assets	48	44
Mortgage loans	865	839
Short term investments	1,308	1,436
Total investments	45,152	46,870
Cash	288	355
Reinsurance receivables (less allowance for uncollectible receivables of $29 and $29)	4,535	4,261
Insurance receivables (less allowance for uncollectible receivables of $44 and $44)	2,598	2,292
Accrued investment income	396	411
Deferred acquisition costs	673	634
Deferred income taxes	296	137
Property and equipment at cost (less accumulated depreciation of $234 and $274)	347	326
Goodwill	147	148
Other assets (Note A)	3,426	1,133
Total assets	57,858	56,567
Insurance reserves:
Claim and claim adjustment expenses	21,990	22,004
Unearned premiums	4,410	4,029
Future policy benefits	10,667	11,179
Short term debt	30	150
Long term debt	2,679	2,708
Other liabilities (includes $100 and $143 due to Loews Corporation) (Note A)	6,667	4,253
Total liabilities	46,443	44,323
Commitments and contingencies (Notes C and F)
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 271,391,107 and 271,205,390 shares outstanding)	683	683
Additional paid-in capital	2,179	2,175
Retained earnings	9,216	9,414
Accumulated other comprehensive (loss) income	(605)	32
Treasury stock (1,649,136 and 1,834,853 shares), at cost	(58)	(60)
Total stockholders’ equity	11,415	12,244
Total liabilities and stockholders' equity	$ 57,858	$ 56,567

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Condensed Consolidated Balance Sheets - (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed maturities securities at amortized cost	$ 37,928	$ 38,215
Equity securities at cost	762
Equity securities at cost		659
Allowance for uncollectible reinsurance	29	29
Allowance for uncollectible insurance receivables	44	44
Accumulated depreciation on property and equipment	234	274
Due to related parties	$ 100	$ 143
Common stock, par value (in usd per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	273,040,243	273,040,243
Common stock, shares outstanding (in shares)	271,391,107	271,205,390
Treasury stock, shares (in shares)	1,649,136	1,834,853

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net income	$ 561	$ 532
Adjustments to reconcile net income to net cash flows provided by operating activities:
Deferred income tax expense	15	122
Trading portfolio activity	(13)	(11)
Net realized investment gains	(11)	(86)
Equity method investees	(15)	42
Net amortization of investments	(30)	(21)
Depreciation and amortization	41	43
Changes in:
Receivables, net	(587)	(195)
Accrued investment income	15	1
Deferred acquisition costs	(43)	(41)
Insurance reserves	563	262
Other assets	(178)	(118)
Other liabilities	(11)	(45)
Other, net	47	30
Total adjustments	(207)	(17)
Net cash flows provided by operating activities	354	515
Dispositions:
Fixed maturity securities - sales	4,781	3,142
Fixed maturity securities - maturities, calls and redemptions	1,306	1,770
Equity securities		22
Equity securities	25
Limited partnerships	93	100
Mortgage loans	68	17
Purchases:
Fixed maturity securities	(5,608)	(4,840)
Equity securities		(8)
Equity securities	(127)
Limited partnerships	(72)	(47)
Mortgage loans	(94)	(72)
Change in other investments	(6)	(3)
Change in short term investments	135	81
Purchases of property and equipment	(76)	(68)
Other, net	14	17
Net cash flows provided by investing activities	439	111
Cash Flows from Financing Activities
Dividends paid to common stockholders	(706)	(676)
Repayment of debt	(150)	0
Other, net	1	(1)
Net cash flows used by financing activities	(855)	(677)
Effect of foreign exchange rate changes on cash	(5)	5
Net change in cash	(67)	(46)
Cash, beginning of year	355	271
Cash, end of period	$ 288	$ 225

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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Previously reported Retained Earnings	Previously reported Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax				$ 0	$ 0
Total stockholder's equity at beginning of period at Dec. 31, 2016		$ 683	$ 2,173	9,359	(173)	$ (73)	$ 9,359	$ (173)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(6)			8
Dividends paid to common stockholders				(680)
Net income	$ 532			532
Other comprehensive (loss) income	205				205
Total stockholder's equity at end of period at Jun. 30, 2017	12,028	683	2,167	9,211	32	(65)
Total stockholder's equity at beginning of period at Mar. 31, 2017					(92)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	272
Other comprehensive (loss) income	124
Total stockholder's equity at end of period at Jun. 30, 2017	12,028	683	2,167	9,211	32	(65)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax				(50)	(16)
Total stockholder's equity at beginning of period at Dec. 31, 2017	12,244	683	2,175	9,364	16	(60)	$ 9,414	$ 32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			4			2
Dividends paid to common stockholders				(709)
Net income	561			561
Other comprehensive (loss) income	(621)				(621)
Total stockholder's equity at end of period at Jun. 30, 2018	11,415	683	2,179	9,216	(605)	(58)
Total stockholder's equity at beginning of period at Mar. 31, 2018					(400)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	270
Other comprehensive (loss) income	(205)
Total stockholder's equity at end of period at Jun. 30, 2018	$ 11,415	$ 683	$ 2,179	$ 9,216	$ (605)	$ (58)

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General

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

General

General

Basis of Presentation

The Condensed Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 89% of the outstanding common stock of CNAF as of June 30, 2018.

The accompanying Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, including certain financial statement notes, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in CNAF's Annual Report on Form 10-K filed with the Securities and Exchange Commission for the year ended December 31, 2017, including the summary of significant accounting policies in Note A. The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

The interim financial data as of June 30, 2018 and for the three and six months ended June 30, 2018 and 2017 is unaudited. However, in the opinion of management, the interim data includes all adjustments, including normal recurring adjustments, necessary for a fair statement of the Company's results for the interim periods. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.

Recently Adopted Accounting Standards Updates (ASU)

ASU 2014-09: In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services.

On January 1, 2018, the Company adopted the updated guidance using the modified retrospective method applied to all contracts which were not completed as of the date of adoption, with the cumulative effect recognized as an adjustment to the opening balance of Retained earnings. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Under the new guidance, revenue on warranty products and services will be recognized more slowly compared to the historic revenue recognition pattern. In addition, for warranty products in which the Company acts as the principal in the transaction, Non-insurance warranty revenue and Non-insurance warranty expense are increased to reflect the gross amount paid by consumers, including the retail seller’s markup which is considered a commission to the Company's agent. This gross-up of revenue and expense also resulted in an increase to Other assets and Other liabilities on the Company's Condensed Consolidated Balance Sheets as the revenue and expense are recognized over the actuarially determined expected claims emergence pattern.

The cumulative effect changes to the Condensed Consolidated Balance Sheet for the adoption of the updated guidance on January 1, 2018 were as follows:

(In millions)	Balance as of December 31, 2017		Adjustments Due to Adoption of Topic 606			Balance as of January 1, 2018
Other assets	$	1,133	$	1,882		$	3,015
Other liabilities	4,253		1,969			6,222
Deferred income taxes	137		21			158
Retained earnings	9,414		(66		)	9,348

The impact of adoption on the Condensed Consolidated Statements of Operations and Balance Sheet was as follows:

Periods ended June 30, 2018	Three Months									Six Months
	Prior to Adoption			Effect of Adoption			As Reported			Prior to Adoption			Effect of Adoption			As Reported
(In millions)
Statement of operations:
Non-insurance warranty revenue	$	105		$	143		$	248		$	206		$	280		$	486
Total revenues	2,431			143			2,574			4,829			280			5,109
Non-insurance warranty expense	80			145			225			158			283			441
Total claims, benefits and expenses	2,099			145			2,244			4,150			283			4,433
Income before income tax	332			(2		)	330			679			(3		)	676
Income tax expense	(61		)	1			(60		)	(116		)	1			(115		)
Net income	271			(1		)	270			563			(2		)	561
Balance sheet(1) at June 30, 2018:
Other assets										$	3,228		$	198		$	3,426
Other liabilities										6,466			201			6,667
Deferred income taxes										295			1			296
Retained earnings										9,218			(2		)	9,216

(1) The Prior to Adoption amounts presented include the cumulative effect adjustment at adoption.

See Note J to the Condensed Consolidated Financial Statements for additional information regarding non-insurance revenues from contracts with customers.

ASU 2016-01: 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 updated accounting guidance requires changes to the reporting model for financial instruments. The guidance primarily changes the model for equity securities by requiring changes in the fair value of equity securities (except those accounted for under the equity method of accounting, those without readily determinable fair values and those that result in consolidation of the investee) to be recognized through the income statement. The Company adopted the updated guidance on January 1, 2018 and recognized a cumulative effect adjustment that increased beginning Retained earnings by $28 million, net of tax. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

For the three and six months ended June 30, 2018, the Company recognized $10 million and $25 million in pretax losses within Net realized investment gains (losses) for the change in fair value of non-redeemable preferred stock and $2 million and $2 million in pretax gains within Net investment income for the change in fair value of common stock as a result of this change. For the three and six months ended June 30, 2017, there was less than a $1 million decrease and a $1 million decrease in the fair value of common stock and a $2 million increase and a $7 million increase in the fair value of non-redeemable preferred stock recognized in Other comprehensive income. The Company's non-redeemable preferred stock contain characteristics of debt securities, are priced similarly to bonds, and are held primarily for income generation through periodic dividends. While recognition of gains and losses on these securities are no longer discretionary, management does not consider the changes in fair value of non-redeemable preferred stock to be reflective of our primary operations. As such, the changes in the fair value of these securities are recorded through Net realized investments gains (losses). The company owns certain common stock with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income.

ASU 2017-07: In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The updated accounting guidance requires changes to the presentation of the components of net periodic benefit cost on the income statement by requiring service cost to be presented with other employee compensation costs and other components of net periodic pension cost to be presented outside of any subtotal of operating income. The ASU also stipulates that only the service cost component of net benefit cost is eligible for capitalization. The Company adopted the updated guidance effective January 1, 2018. The guidance was applied on a prospective basis for capitalization of service costs and on a retrospective basis for the presentation of the service cost and other components of net periodic benefit costs in the Company's Condensed Consolidated Statements of Operations and in its disclosures. The Company expanded the related footnote disclosure, Note G to the Condensed Consolidated Financial Statements, to disclose the amount of service cost and non-service cost components of net periodic benefit cost and the line items in the Condensed Consolidated Statements of Operations in which such amounts are reported. The change limiting the costs eligible for capitalization is not material to the Company’s results of operations or financial position.

ASU 2018-02: In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. GAAP requires the remeasurement of deferred tax assets and liabilities due to a change in the tax rate to be included in Net income, even if the related income tax effects were originally recognized in Accumulated other comprehensive income (AOCI). The ASU allows a reclassification from AOCI to Retained earnings for stranded tax effects resulting from the new U.S. Federal corporate income tax rate enacted on December 22, 2017. The Company early adopted the updated guidance effective January 1, 2018 and elected to reclassify the stranded income tax effects relating to the reduction in the Federal corporate income tax rate from AOCI to Retained earnings at the beginning of the period of adoption. The net impact of the accounting change resulted in a $12 million increase in AOCI and a corresponding decrease in Retained earnings. The $12 million increase in AOCI is comprised of a $142 million increase in net unrealized gains (losses) on investments partially offset by a $130 million decrease in unrecognized pension and postretirement benefits.

The Company releases tax effects from AOCI utilizing the security-by-security approach for Net unrealized gains (losses) on investments with Other-than-temporary impairment (OTTI) losses and Net unrealized gains (losses) on other investments. For Pension and postretirement benefits, tax effects from AOCI are released at enacted tax rates based on the pre-tax adjustments to pension liabilities or assets recognized within OCI.

Accounting Standards Pending Adoption

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet assets and liabilities for the rights and obligations created by the majority of leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the use of the allowance method rather than the write-down method for credit losses within the available-for-sale fixed maturities portfolio. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

Income Tax Reform Update

On December 22, 2017, H.R.1, “An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018,” was signed into law (Tax Reform Legislation).

Shortly after enactment, the Securities and Exchange Commission Staff issued Staff Accounting Bulletin No. 118 (SAB 118) to provide guidance on accounting for the Tax Reform Legislation impacts when the measurements of the income tax effects are complete, incomplete, or incomplete but for which a provisional amount can be estimated. SAB 118 permits the recognition of provisional amounts, and adjustments to provisional amounts, in subsequent reporting periods within the one year measurement period.

The Company has reflected the following incomplete but reasonably estimated provisional items in Deferred income taxes on the Condensed Consolidated Balance Sheet at June 30, 2018. The effects of the adjustments to the Company’s provisional amounts for the three and six months ended June 30, 2018 did not impact income tax expense.

• The Company has recalculated its insurance reserves and the transition adjustment from existing law.

• The Company has recalculated amounts under special accounting method provisions for recognizing income for Federal income tax purposes no later than for financial accounting purposes and the transition adjustment from existing law.

• The Company has not recorded current or deferred taxes with respect to the international provisions since it does not expect to have inclusions in U.S. taxable income for certain earnings of foreign subsidiaries in future years.

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Earnings (Loss) Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Earnings (Loss) Per Share

Earnings (loss) per share is based on the weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

For the three and six months ended June 30, 2018, approximately 835 thousand and 929 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, approximately 445 thousand and 2 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share, because the effect would have been antidilutive.

For the three and six months ended June 30, 2017, approximately 847 thousand and 915 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were included in the calculation of diluted earnings per share. For those same periods, less than 1 thousand potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans were not included in the calculation of diluted earnings per share, because the effect would have been antidilutive.

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Investments

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Investments

Investments

The significant components of Net investment income are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Fixed maturity securities	$	444		$	457		$	890		$	912
Equity securities	12			2			22			3
Limited partnership investments	40			16			70			106
Mortgage loans	14			8			25			15
Short term investments	6			3			12			6
Trading portfolio	3			4			5			6
Other	3			—			3			1
Gross investment income	522			490			1,027			1,049
Investment expense	(16		)	(15		)	(31		)	(29		)
Net investment income	$	506		$	475		$	996		$	1,020

During the three and six months ended June 30, 2018, $2 million and $1 million of Net investment income was recognized due to the change in fair value of common stock still held as of June 30, 2018.

Net realized investment gains (losses) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	37		$	56		$	106		$	105
Gross realized losses	(33		)	(12		)	(84		)	(29		)
Net realized investment gains (losses) on fixed maturity securities	4			44			22			76
Equity securities	(10		)	—			(25		)	—
Derivatives	4			(3		)	9			(2		)
Short term investments and other	1			9			5			12
Net realized investment gains (losses)	$	(1	)	$	50		$	11		$	86

During the three and six months ended June 30, 2018, $10 million and $25 million of Net realized investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2018.

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Periods ended June 30	Three Months				Six Months
(In millions)	2018		2017		2018		2017
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	—	$	2	$	5	$	4
Asset-backed	—		—		1		—
OTTI losses recognized in earnings	$	—	$	2	$	6	$	4

The following tables present a summary of fixed maturity and equity securities.

June 30, 2018 (1)	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,883	$	938	$	203	$	18,618	$	—
States, municipalities and political subdivisions	10,856		1,161		8		12,009		—
Asset-backed:
Residential mortgage-backed	4,961		72		85		4,948		(25		)
Commercial mortgage-backed	2,082		23		33		2,072		—
Other asset-backed	1,557		9		9		1,557		—
Total asset-backed	8,600		104		127		8,577		(25		)
U.S. Treasury and obligations of government-sponsored enterprises	127		3		3		127		—
Foreign government	436		6		5		437		—
Redeemable preferred stock	9		1		—		10		—
Total fixed maturity securities available-for-sale	37,911		2,213		346		39,778		$	(25	)
Total fixed maturity securities trading	17						17
Total fixed maturity securities	$	37,928	$	2,213	$	346	$	39,795

December 31, 2017	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,210	$	1,625	$	28	$	18,807	$	—
States, municipalities and political subdivisions	12,478		1,551		2		14,027		(11		)
Asset-backed:
Residential mortgage-backed	5,043		109		32		5,120		(27		)
Commercial mortgage-backed	1,840		46		14		1,872		—
Other asset-backed	1,083		16		5		1,094		—
Total asset-backed	7,966		171		51		8,086		(27		)
U.S. Treasury and obligations of government-sponsored enterprises	111		2		4		109		—
Foreign government	437		9		2		444		—
Redeemable preferred stock	10		1		—		11		—
Total fixed maturity securities available-for-sale	38,212		3,359		87		41,484		$	(38	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	21		7		1		27
Preferred stock	638		31		1		668
Total equity securities available-for-sale	659		38		2		695
Total fixed maturity and equity securities	$	38,874	$	3,397	$	89	$	42,182

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

The net unrealized gains on investments included in the tables above are recorded as a component of AOCI. When presented in AOCI, these amounts are net of tax and any required Shadow Adjustments. To the extent that unrealized gains on fixed income securities supporting certain products within the Life & Group segment would result in a premium deficiency if realized, a related increase in Insurance reserves is recorded, net of tax, as a reduction of net unrealized gains through Other comprehensive income (loss) (Shadow Adjustments). As of June 30, 2018 and December 31, 2017, the net unrealized gains on investments included in AOCI were correspondingly reduced by Shadow Adjustments of $1,186 million and $1,411 million.

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
June 30, 2018 (1)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	6,963	$	192	$	193	$	11	$	7,156	$	203
States, municipalities and political subdivisions	723		8		3		—		726		8
Asset-backed:
Residential mortgage-backed	3,183		68		344		17		3,527		85
Commercial mortgage-backed	913		16		228		17		1,141		33
Other asset-backed	632		6		27		3		659		9
Total asset-backed	4,728		90		599		37		5,327		127
U.S. Treasury and obligations of government-sponsored enterprises	49		1		19		2		68		3
Foreign government	178		3		40		2		218		5
Total	$	12,641	$	294	$	854	$	52	$	13,495	$	346

	Less than 12 Months				12 Months or Longer				Total
December 31, 2017	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	1,354	$	21	$	168	$	7	$	1,522	$	28
States, municipalities and political subdivisions	72		1		85		1		157		2
Asset-backed:
Residential mortgage-backed	1,228		5		947		27		2,175		32
Commercial mortgage-backed	403		4		212		10		615		14
Other asset-backed	248		3		18		2		266		5
Total asset-backed	1,879		12		1,177		39		3,056		51
U.S. Treasury and obligations of government-sponsored enterprises	49		2		21		2		70		4
Foreign government	166		2		4		—		170		2
Total fixed maturity securities available-for-sale	3,520		38		1,455		49		4,975		87
Equity securities available-for-sale:
Common stock	7		1		—		—		7		1
Preferred stock	93		1		—		—		93		1
Total equity securities available-for-sale	100		2		—		—		100		2
Total	$	3,620	$	40	$	1,455	$	49	$	5,075	$	89

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

Based on current facts and circumstances, the Company believes the unrealized losses presented in the June 30, 2018 securities in a gross unrealized loss position table above are not indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. The Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional OTTI losses to be recorded as of June 30, 2018.

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of June 30, 2018 and 2017 and for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Beginning balance of credit losses on fixed maturity securities	$	25		$	32		$	27		$	36
Reductions for securities sold during the period	(4		)	(2		)	(6		)	(6		)
Ending balance of credit losses on fixed maturity securities	$	21		$	30		$	21		$	30

Contractual Maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

	June 30, 2018				December 31, 2017
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,301	$	1,322	$	1,135	$	1,157
Due after one year through five years	8,211		8,421		8,165		8,501
Due after five years through ten years	16,138		16,240		16,060		16,718
Due after ten years	12,261		13,795		12,852		15,108
Total	$	37,911	$	39,778	$	38,212	$	41,484

Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life.

Derivative Financial Instruments

The Company holds an embedded derivative on a funds withheld liability with a notional value of $161 million and $167 million as of June 30, 2018 and December 31, 2017 and a fair value of $4 million and $(3) million as of June 30, 2018 and December 31, 2017. The embedded derivative on the funds withheld liability is accounted for separately and reported with the funds withheld liability in Other liabilities on the Condensed Consolidated Balance Sheets.

Investment Commitments

As of June 30, 2018, the Company had committed approximately $551 million to future capital calls from various third-party limited partnership investments in exchange for an ownership interest in the related partnerships.

As of June 30, 2018, the Company had mortgage loan commitments of $15 million representing signed loan applications received and accepted.

The Company invests in various privately placed debt securities, including bank loans, as part of its overall investment strategy and has committed to additional future purchases, sales and funding. Purchases and sales of privately placed debt securities are recorded once funded. As of June 30, 2018, the Company had commitments to purchase or fund additional amounts of $272 million and sell $111 million under the terms of such securities.

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Fair Value

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable.

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.

Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are not observable.

Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general, the Company seeks to price securities using third-party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs the Company believes market participants would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted by the Company.

The Company performs control procedures over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include i) the review of pricing service methodologies or broker pricing qualifications, ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria, iv) deep dives, where the Company performs an independent analysis of the inputs and assumptions used to price individual securities and v) pricing validation, where prices received are compared to prices independently estimated by the Company.

Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the U.S. Treasury, government-sponsored enterprises and foreign governments and redeemable preferred stock.

June 30, 2018								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	166	$	18,949		$	94	$	19,209
States, municipalities and political subdivisions	—		12,008			1		12,009
Asset-backed	—		8,304			273		8,577
Total fixed maturity securities	166		39,261			368		39,795
Equity securities:
Common stock	85		—			4		89
Non-redeemable preferred stock	67		604			13		684
Total equity securities	152		604			17		773
Short term and other	167		1,050			—		1,217
Total assets	$	485	$	40,915		$	385	$	41,785
Liabilities
Other liabilities	$	—	$	(4	)	$	—	$	(4	)
Total liabilities	$	—	$	(4	)	$	—	$	(4	)

December 31, 2017							Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2		Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	128	$	19,148	$	98	$	19,374
States, municipalities and political subdivisions	—		14,026		1		14,027
Asset-backed	—		7,751		335		8,086
Total fixed maturity securities	128		40,925		434		41,487
Equity securities:
Common stock	23		—		4		27
Non-redeemable preferred stock	68		584		16		668
Total equity securities	91		584		20		695
Short term and other	396		958		—		1,354
Total assets	$	615	$	42,467	$	454	$	43,536
Liabilities
Other liabilities	$	—	$	3	$	—	$	3
Total liabilities	$	—	$	3	$	—	$	3

The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of April 1, 2018	$	100		$	1	$	279		$	18		$	—	$	398
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		—			(1		)	—		(1		)
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(1		)	—			—		(2		)
Total realized and unrealized investment gains (losses)	(1		)	—		(1		)	(1		)	—		(3		)
Purchases	2			—		41			—			—		43
Sales	(5		)	—		—			—			—		(5		)
Settlements	(2		)	—		(6		)	—			—		(8		)
Transfers into Level 3	—			—		13			—			—		13
Transfers out of Level 3	—			—		(53		)	—			—		(53		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(1	)	$	—	$	(1	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Life settlement contracts			Total
Balance as of April 1, 2017	$	121		$	1	$	256		$	19		$	—	$	46		$	443
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			—		—			1
Reported in Other revenues	—			—		—			—			—		—			—
Reported in Other comprehensive income	—			—		1			1			—		—			2
Total realized and unrealized investment gains (losses)	—			—		2			1			—		—			3
Purchases	—			—		13			—			—		—			13
Sales	—			—		—			(1		)	—		(45		)	(46		)
Settlements	(11		)	—		(7		)	—			—		—			(18		)
Transfers into Level 3	—			—		24			—			—		—			24
Transfers out of Level 3	(10		)	—		(70		)	—			—		—			(80		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—	$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—	$	—		$	—

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of January 1, 2018	$	98		$	1	$	335		$	20		$	—	$	454
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	(1		)	—		7			(3		)	—		3
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(6		)	—			—		(7		)
Total realized and unrealized investment gains (losses)	(2		)	—		1			(3		)	—		(4		)
Purchases	2			—		71			—			—		73
Sales	(5		)	—		(72		)	—			—		(77		)
Settlements	(4		)	—		(12		)	—			—		(16		)
Transfers into Level 3	5			—		13			—			—		18
Transfers out of Level 3	—			—		(63		)	—			—		(63		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(3	)	$	—	$	(3	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments			Life settlement contracts			Total
Balance as of January 1, 2017	$	130		$	1	$	199		$	19		$	—		$	58		$	407
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			1			—			2
Reported in Other revenues	—			—		—			—			—			6			6
Reported in Other comprehensive income	1			—		3			2			—			—			6
Total realized and unrealized investment gains (losses)	1			—		4			2			1			6			14
Purchases	5			—		51			1			—			—			57
Sales	(1		)	—		—			(3		)	(1		)	(58		)	(63		)
Settlements	(25		)	—		(13		)	—			—			(5		)	(43		)
Transfers into Level 3	—			—		52			—			—			—			52
Transfers out of Level 3	(10		)	—		(75		)	—			—			—			(85		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—		$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—		$	—		$	—

Securities may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. During the three months ended June 30, 2018, there were no transfers between Level 1 and Level 2. During the six months ended June 30, 2018, there were $29 million of transfers from Level 2 to Level 1 and no transfers from Level 1 to Level 2. During the three and six months ended June 30, 2017 there were no transfers between Level 1 and Level 2. The Company's policy is to recognize transfers between levels at the beginning of quarterly reporting periods.

Valuation Methodologies and Inputs

The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified.

Fixed Maturity Securities

Level 1 securities include highly liquid and exchange traded bonds and redeemable preferred stock, valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology, or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with inputs that are not market observable.

Equity Securities

Level 1 securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with inputs that are not market observable.

Short Term and Other Invested Assets

Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds and treasury bills. Level 2 primarily includes commercial paper, for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short term investments as presented in the tables above differ from the amounts presented on the Condensed Consolidated Balance Sheets because certain short term investments, such as time deposits, are not measured at fair value.

As of June 30, 2018 and December 31, 2017, there were approximately $42 million and $39 million of overseas deposits within other invested assets, which can be redeemed at net asset value in 90 days or less. Overseas deposits are excluded from the fair value hierarchy because their fair value is recorded using the net asset value per share (or equivalent) practical expedient.

Life Settlement Contracts

The Company sold its life settlement contracts to a third party in 2017. The valuation of the life settlement contracts was based on the terms of sale. The contracts were classified as Level 3 as there was not an active market for life settlement contracts.

Derivative Financial Investments

Level 2 investments primarily include the embedded derivative on the funds withheld liability. The embedded derivative on funds withheld liability is valued using the change in fair value of the assets supporting the funds withheld liability, which are fixed maturity securities valued with observable inputs.

Significant Unobservable Inputs

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company.

June 30, 2018	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	130	Discounted cash flow	Credit spread	1% - 12% (3%)

December 31, 2017	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	136	Discounted cash flow	Credit spread	1% - 12% (3%)

For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement.

Financial Assets and Liabilities Not Measured at Fair Value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables.

June 30, 2018	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	865	$	—	$	—	$	850	$	850
Note receivable	34		—		—		34		34
Liabilities
Short term debt	$	30	$	—	$	30	$	—	$	30
Long term debt	2,679		—		2,754		—		2,754

December 31, 2017	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	839	$	—	$	—	$	844	$	844
Note receivable	46		—		—		46		46
Liabilities
Short term debt	$	150	$	—	$	150	$	—	$	150
Long term debt	2,708		—		2,896		—		2,896

The following methods and assumptions were used to estimate the fair value of these financial assets and liabilities.

The fair values of mortgage loans were based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar quality loans, adjusted for specific loan risk.

The fair value of the note receivable was based on the present value of the expected future cash flows discounted at the current interest rate for origination of similar notes, adjusted for specific credit risk.

The Company's senior notes and debentures were valued based on observable market prices. The fair value for other debt was estimated using discounted cash flows based on current incremental borrowing rates for similar borrowing arrangements.

The carrying amounts reported on the Condensed Consolidated Balance Sheets for Cash, Short term investments not carried at fair value, Accrued investment income and certain Other assets and Other liabilities approximate fair value due to the short term nature of these items. These assets and liabilities are not listed in the tables above.

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Claim and Claim Adjustment Expense Reserves

6 Months Ended

Jun. 30, 2018

Liability for Claims and Claims Adjustment Expense [Abstract]

Claim and Claim Adjustment Expense Reserves

Claim and Claim Adjustment Expense Reserves

The Company's property and casualty insurance claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including incurred but not reported (IBNR) claims as of the reporting date. The Company's reserve projections are based primarily on detailed analysis of the facts in each case, the Company's experience with similar cases and various historical development patterns. Consideration is given to such historical patterns as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, as well as court decisions, economic conditions, including inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves.

Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers' compensation, general liability and professional liability claims. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the Company's ultimate cost for insurance losses will not exceed current estimates.

Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in the Company's results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $26 million and $60 million for the three and six months ended June 30, 2018. The company reported catastrophe losses, net of reinsurance, of $39 million and $73 million for the three and six months ended June 30, 2017. Net catastrophe losses in 2018 and 2017 related primarily to U.S. weather-related events.

Liability for Unpaid Claim and Claim Adjustment Expenses Rollforward

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group segment.

For the six months ended June 30
(In millions)	2018			2017
Reserves, beginning of year:
Gross	$	22,004		$	22,343
Ceded	3,934			4,094
Net reserves, beginning of year	18,070			18,249
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	2,552			2,443
Decrease in provision for insured events of prior years	(112		)	(159		)
Amortization of discount	92			93
Total net incurred (1)	2,532			2,377
Net payments attributable to:
Current year events	(312		)	(266		)
Prior year events	(2,387		)	(2,331		)
Total net payments	(2,699		)	(2,597		)
Foreign currency translation adjustment and other	(70		)	70
Net reserves, end of period	17,833			18,099
Ceded reserves, end of period	4,157			4,080
Gross reserves, end of period	$	21,990		$	22,179

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits which are not reflected in the table above.

Net Prior Year Development

Changes in estimates of claim and claim adjustment expense reserves, net of reinsurance, for prior years are defined as net prior year loss reserve development (development). These changes can be favorable or unfavorable. The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Specialty	$	(44	)	$	(23	)	$	(74	)	$	(35	)
Commercial	(13		)	(34		)	(22		)	(77		)
International	(2		)	2			(2		)	—
Corporate & Other	—			—			—			—
Total pretax (favorable) unfavorable development	$	(59	)	$	(55	)	$	(98	)	$	(112	)

Specialty

The following table presents further detail of the development recorded for the Specialty segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	3		$	2		$	23		$	22
Other Professional Liability and Management Liability	(34		)	(37		)	(68		)	(69		)
Surety	(15		)	—			(30		)	—
Warranty	(6		)	6			(6		)	6
Other	8			6			7			6
Total pretax (favorable) unfavorable development	$	(44	)	$	(23	)	$	(74	)	$	(35	)

Three Months

2018

Favorable development in other professional liability and management liability was primarily in professional liability errors and omissions (E&O) reflecting lower than expected claim frequency in accident years 2014 through 2016 and favorable severity for accident years 2012 and prior.

Favorable development in surety was driven by continued lower than expected loss emergence on accident years 2015 and prior. 

2017

Favorable development in other professional liability and management liability was primarily due to lower than expected claim frequency in accident years 2013 through 2015 and lower than expected severity in accident years 2014 through 2016 for professional liability.

Six Months

2018

Unfavorable development for medical professional liability was primarily due to higher than expected severity in accident years 2014 and 2017 in our hospitals business.

Favorable development in other professional liability and management liability was primarily due to lower than expected claim frequency for accident years 2013 through 2017 related to financial institutions. Additional favorable development was in professional liability errors and omissions (E&O) reflecting lower than expected claim frequency in accident years 2014 through 2016 and favorable severity for accident years 2012 and prior.

Favorable development for surety was due to continued lower than expected loss emergence for accident years 2015 and prior.

2017

Unfavorable development in medical professional liability was primarily due to continued higher than expected frequency in aging services.

Favorable development in other professional liability and management liability was primarily due to favorable settlements on closed claims and a lower than expected frequency of large losses for accident years 2011 through 2016 for professional and management liability, lower than expected claim frequency in accident years 2013 through 2015 for professional liability and lower than expected severity in accident years 2014 through 2016 for professional liability.

Commercial

The following table presents further detail of the development recorded for the Commercial segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Commercial Auto	$	—		$	1		$	(1	)	$	(25	)
General Liability	26			1			18			(17		)
Workers' Compensation	(6		)	(47		)	(12		)	(47		)
Property and Other	(33		)	11			(27		)	12
Total pretax (favorable) unfavorable development	$	(13	)	$	(34	)	$	(22	)	$	(77	)

Three Months

2018

Unfavorable development in general liability was driven by higher than expected claim severity in umbrella in accident years 2013 through 2015. 

Favorable development in property and other was driven by lower than expected claim severity from catastrophes in accident year 2017.

2017

Favorable development for workers’ compensation was primarily related to decreases in frequency and severity in recent accident years, partially attributable to California reforms related to decreases in medical costs.

Unfavorable development for property and other was primarily due to higher than expected severity in accident year 2016.

Six Months

2018

Unfavorable development in general liability was driven by higher than expected claim severity in umbrella in accident years 2013 through 2015. 

Favorable development in property and other was driven by lower than expected claim severity from catastrophes in accident year 2017.

2017

Favorable development for commercial auto was primarily due to lower than expected severity in accident years 2013 through 2015.

Favorable development for general liability was due to lower than expected severity in life sciences.

Favorable development for workers’ compensation was primarily related to decreases in frequency and severity in recent accident years, partially attributable to California reforms related to decreases in medical costs.

Unfavorable development for property and other was primarily due to higher than expected severity in accident year 2016.

International

The following table presents further detail of the development recorded for the International segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Casualty	$	(6	)	$	1		$	(6	)	$	1
Property	12			(10		)	12			(11		)
Energy and Marine	(5		)	(3		)	(5		)	(3		)
Specialty	9			16			9			15
Healthcare and Technology	(12		)	(2		)	(12		)	(2		)
Total pretax (favorable) unfavorable development	$	(2	)	$	2		$	(2	)	$	—

Three Months

2018

Unfavorable development in property was primarily driven by higher than expected severity in Canada and higher than expected frequency in Hardy, both in accident year 2017.

Unfavorable development in specialty was driven by increased severity in accident year 2017 related to professional indemnity.

Favorable development in healthcare and technology was primarily driven by lower than expected frequency in accident years 2015 and prior related to healthcare in Europe.

2017

Favorable development for property was due to better than expected frequency in accident years 2014 through 2016.

Unfavorable development for specialty was primarily due to higher than expected severity in accident year 2015 arising from the management liability business, partially offset by favorable development in accident years 2014 and prior. Additional unfavorable development was related to adverse large claims experience in the Hardy political risks portfolio, relating largely to accident year 2016.

Six Months

2018

The drivers of development for the six month period were consistent with the three month summary above.

2017

The drivers of development for the six month period were generally consistent with the three month summary above.

Asbestos and Environmental Pollution (A&EP) Reserves

In 2010, Continental Casualty Company (CCC) together with several of the Company’s other insurance subsidiaries completed a transaction with National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the Company’s legacy A&EP liabilities were ceded to NICO through a Loss Portfolio Transfer (LPT). At the effective date of the transaction, the Company ceded approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves to NICO under a retroactive reinsurance agreement with an aggregate limit of $4 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third-party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third-party reinsurance related to these liabilities. The Company paid NICO a reinsurance premium of $2 billion and transferred to NICO billed third-party reinsurance receivables related to A&EP claims with a net book value of $215 million, resulting in total consideration of $2.2 billion.

In years subsequent to the effective date of the LPT, the Company recognized adverse prior year development on its A&EP reserves resulting in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT have exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which the Company recognizes a change in the estimate of A&EP reserves that increases or decreases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is affected and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders' benefits in the Condensed Consolidated Statement of Operations.

The following table presents the impact of the Loss Portfolio Transfer on the Condensed Consolidated Statements of Operations.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Additional amounts ceded under LPT:
Net A&EP adverse development before consideration of LPT	$	—		$	—		$	113		$	60
Provision for uncollectible third-party reinsurance on A&EP	—			—			(16		)	—
Total additional amounts ceded under LPT	—			—			97			60
Retroactive reinsurance benefit recognized	(15		)	(3		)	(72		)	(43		)
Pretax impact of deferred retroactive reinsurance	$	(15	)	$	(3	)	$	25		$	17

Based upon the Company's annual A&EP reserve review, net unfavorable prior year development of $113 million and $60 million was recognized before consideration of cessions to the LPT for the six months ended June 30, 2018 and 2017. Additionally, in 2018, the Company released a portion of its provision for uncollectible third party reinsurance. The 2018 unfavorable development was driven by higher than anticipated defense costs on direct asbestos environmental accounts and paid losses on assumed reinsurance exposures. The 2017 unfavorable development was driven by modestly higher anticipated payouts on claims from known sources of asbestos exposure. While the unfavorable development was ceded to NICO under the LPT, the Company’s Net income for the six month periods were negatively affected due to the application of retroactive reinsurance accounting.

As of June 30, 2018 and December 31, 2017, the cumulative amounts ceded under the LPT were $3.0 billion and $2.9 billion. The unrecognized deferred retroactive reinsurance benefit was $351 million and $326 million as of June 30, 2018 and December 31, 2017.

NICO established a collateral trust account as security for its obligations to the Company. The fair value of the collateral trust account was $3.0 billion and $3.1 billion as of June 30, 2018 and December 31, 2017. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to the Company’s A&EP claims.

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Legal Proceedings, Contingencies and Guarantees

6 Months Ended

Jun. 30, 2018

Legal Proceedings, Commitments and Contingencies, and Guarantees [Abstract]

Legal Proceedings, Contingencies and Guarantees

Legal Proceedings, Contingencies and Guarantees

CNA 401(k) Plus Plan Litigation

In September 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (CAC) (a former subsidiary of CCC), CNAF, the Investment Committee of the CNA 401(k) Plus Plan (Plan), The Northern Trust Company and John Does 1-10 (collectively Defendants) related to the Plan. The complaint alleges that Defendants breached fiduciary duties to the Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the Plan's Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of Plan participants who had invested in the Fixed Income Fund suffered lower returns in their Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. The Plan trustees have provided notice to their fiduciary coverage insurance carriers.

The plaintiff, Defendants and the Plan's fiduciary insurance carriers have agreed on terms to settle this matter and have executed settlement agreements. The plaintiff and Defendants have proposed a class settlement for court approval, and the court granted preliminary approval subject to a fairness hearing. Based on the executed settlement agreements, management has recorded its best estimate of the Company's probable loss and does not believe that the ultimate resolution of this matter will have a material impact on the Company’s results of operations or financial position.

Small Business Premium Rate Adjustment

In 2016 and 2017, the Company identified rating errors related to its multi-peril package product and workers' compensation policies within its Small Business unit and determined that it would voluntarily issue premium refunds along with interest on affected policies. After the rating errors were identified, written and earned premium have been reported net of any impact from the premium rate adjustments. The Company increased Earned premium by $1 million and reduced Earned premium by $37 million for the three and six months ended June 30, 2017. Interest expense increased for interest due to policyholders on the premium rate adjustments by $1 million and $6 million for the three and six months ended June 30, 2017.

The policyholder refunds for the multi-peril package product were issued in the third quarter of 2017. The policyholder refunds for workers’ compensation policies are in process and are expected to be completed by the end of 2018. Interest expense of $1 million was recorded for the six months ended June 30, 2018. The estimated refund liability, including interest, for the workers' compensation policies as of June 30, 2018 was $47 million.

Other Litigation

The Company is a party to other routine litigation incidental to its business, which, based on the facts and circumstances currently known, is not material to the Company's results of operations or financial position.

Guarantees

As of June 30, 2018 and December 31, 2017, the Company had recorded liabilities of approximately $5 million related to guarantee and indemnification agreements and management believes that it is not likely that any future indemnity claims will be significantly greater than the amounts recorded.

In the course of selling business entities and assets to third parties, the Company agreed to guarantee the performance of certain obligations of previously owned subsidiaries and to indemnify purchasers for losses arising out of breaches of representations and warranties with respect to the business entities or assets sold, including, in certain cases, losses arising from undisclosed liabilities or certain named litigation. Such guarantee and indemnification agreements in effect for sales of business entities, assets and third-party loans may include provisions that survive indefinitely. As of June 30, 2018, the aggregate amount related to quantifiable guarantees was $375 million and the aggregate amount related to quantifiable indemnification agreements was $252 million. In certain cases, should the Company be required to make payments under any such guarantee, it would have the right to seek reimbursement from an affiliate of a previously owned subsidiary.

In addition, the Company has agreed to provide indemnification to third-party purchasers for certain losses associated with sold business entities or assets that are not limited by a contractual monetary amount. As of June 30, 2018, the Company had outstanding unlimited indemnifications in connection with the sales of certain of its business entities or assets that included tax liabilities arising prior to a purchaser's ownership of an entity or asset, defects in title at the time of sale, employee claims arising prior to closing and in some cases losses arising from certain litigation and undisclosed liabilities. Certain provisions of the indemnification agreements survive indefinitely, while others survive until the applicable statutes of limitation expire, or until the agreed-upon contract terms expire.

The Company also provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities provided by a previously owned subsidiary. As of June 30, 2018, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.8 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

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Benefit Plans

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Benefit Plans

Benefit Plans

The components of net periodic pension cost (benefit) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net periodic pension cost (benefit)
Service cost	$	—		$	—		$	—		$	—
Non-service cost:
Interest cost on projected benefit obligation	24			26			47			52
Expected return on plan assets	(40		)	(39		)	(80		)	(78		)
Amortization of net actuarial loss	9			9			18			18
Settlement loss	1			—			5			2
Total non-service cost	(6		)	(4		)	(10		)	(6		)
Total net periodic pension cost (benefit)	$	(6	)	$	(4	)	$	(10	)	$	(6	)

For the three and six months ended June 30, 2018, the Company recognized $2 million and $3 million of non-service cost in Insurance claims and policyholders' benefits and $4 million and $7 million of non-service cost in Other operating expenses.

For the three and six months ended June 30, 2017, the Company recognized $1 million and $2 million of non-service cost in Insurance claims and policyholders' benefits and $3 million and $4 million of non-service cost in Other operating expenses.

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Accumulated Other Comprehensive Income (Loss) by Component

6 Months Ended

Jun. 30, 2018

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

Accumulated Other Comprehensive Income (Loss) by Component

Accumulated Other Comprehensive Income (Loss) by Component

The tables below display the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2018	$	21		$	430		$	(765	)	$	(86	)	$	(400	)
Other comprehensive income (loss) before reclassifications	(1		)	(156		)	—			(52		)	(209		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(1), $2, $- and $1	—			3			(7		)	—			(4		)
Other comprehensive income (loss) net of tax (expense) benefit of $1, $46, $(2), $- and $45	(1		)	(159		)	7			(52		)	(205		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2017	$	26		$	709	$	(640	)	$	(187	)	$	(92	)
Other comprehensive income (loss) before reclassifications	(1		)	108		—			42			149
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $1, $(15), $3, $-, and $(11)	(1		)	31		(5		)	—			25
Other comprehensive income (loss) net of tax (expense) benefit of $-, $(48), $(3), $- and $(51)	—			77		5			42			124
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2018, as previously reported	$	25		$	750		$	(645	)	$	(98	)	$	32
Cumulative effect adjustment from accounting change for adoption of ASU 2018-02(1)	5			137			(130		)	—			12
Cumulative effect adjustment from accounting change for adoption of ASU 2016-01(1) net of tax (expense) benefit of $-, $8, $-, $- and $8	—			(28		)	—			—			(28		)
Balance as of January 1, 2018, as adjusted	30			859			(775		)	(98		)	16
Other comprehensive income (loss) before reclassifications	(11		)	(570		)	—			(40		)	(621		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(5), $5, $- and $-	(1		)	18			(17		)	—			—
Other comprehensive income (loss) net of tax (expense) benefit of $3, $155, $(5), $- and $153	(10		)	(588		)	17			(40		)	(621		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(1) See Note A to the Condensed Consolidated Financial Statements for additional information.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2017	$	30		$	642	$	(647	)	$	(198	)	$	(173	)
Other comprehensive income (loss) before reclassifications	(1		)	193		—			53			245
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(1), $(24), $7, $- and $(18)	3			49		(12		)	—			40
Other comprehensive income (loss) net of tax (expense) benefit of $1, $(86), $(7), $- and $(92)	(4		)	144		12			53			205
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows:

Component of AOCI	Condensed Consolidated Statements of Operations Line Item Affected by Reclassifications
Net unrealized gains (losses) on investments with OTTI losses	Net realized investment gains (losses)
Net unrealized gains (losses) on other investments	Net realized investment gains (losses)
Pension and postretirement benefits	Other operating expenses and Insurance claims and policyholders' benefits

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Business Segments

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Business Segments

Business Segments

The Company's property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. These three segments are collectively referred to as Property & Casualty Operations. The Company's operations outside of Property & Casualty Operations are managed and reported in two segments: Life & Group and Corporate & Other.

Effective January 1, 2018, management changed the segment presentation of the life sciences business and technology and media related errors and omissions business within the Specialty and Commercial business segments. The life sciences business moved from the Specialty business segment to the Commercial business segment and the technology and media related errors and omissions business moved from the Commercial business segment to the Specialty business segment. The new management responsibility for these businesses better aligns with line of business underwriting expertise and the manner in which the products are sold. Prior period information has been conformed to the new segment presentation.

The accounting policies of the segments are the same as those described in Note A to the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2017. The Company manages most of its assets on a legal entity basis, while segment operations are generally conducted across legal entities. As such, only Insurance and Reinsurance receivables, Insurance reserves, Deferred acquisition costs and Goodwill are readily identifiable for individual segments. Distinct investment portfolios are not maintained for every individual segment; accordingly, allocation of assets to each segment is not performed. Therefore, a significant portion of Net investment income and Realized investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted. All significant intersegment income and expense has been eliminated. Income taxes have been allocated on the basis of the taxable income of the segments.

In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance. Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio.

The performance of the Company's insurance operations is monitored by management through core income (loss), which is derived from certain income statement amounts. The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk.

Core income (loss) is calculated by excluding from net income (loss) the after-tax effects of i) net realized investment gains (losses), ii) income or loss from discontinued operations, iii) any cumulative effects of changes in accounting guidance and iv) deferred tax asset and liability remeasurement as a result of an enacted U.S. Federal tax rate change. The calculation of core income (loss) excludes net realized investment gains or losses because net realized investment gains or losses are generally driven by economic factors that are not necessarily consistent with key drivers of underwriting performance, and are therefore not considered an indication of trends in insurance operations.

The Company's results of operations and selected balance sheet items by segment are presented in the following tables.

Three months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations		Total
Operating revenues
Net earned premiums	$	683		$	753		$	248		$	131		$	—		$	—	$	1,815
Net investment income	130			157			15			198			6			—		506
Non-insurance warranty revenue	248			—			—			—			—			—		248
Other revenues	—			8			(1		)	—			(1		)	—		6
Total operating revenues	1,061			918			262			329			5			—		2,575
Claims, benefits and expenses
Net incurred claims and benefits	372			470			166			327			(14		)	—		1,321
Policyholders’ dividends	1			5			—			—			—			—		6
Amortization of deferred acquisition costs	149			127			83			—			—			—		359
Non-insurance warranty expense	225			—			—			—			—			—		225
Other insurance related expenses	70			126			10			30			—			—		236
Other expenses	12			10			7			1			67			—		97
Total claims, benefits and expenses	829			738			266			358			53			—		2,244
Core income (loss) before income tax	232			180			(4		)	(29		)	(48		)	—		331
Income tax (expense) benefit on core income (loss)	(49		)	(37		)	(3		)	19			9			—		(61		)
Core income (loss)	$	183		$	143		$	(7	)	$	(10	)	$	(39	)	$	—	270
Net realized investment gains (losses)																		(1		)
Income tax (expense) benefit on net realized investment gains (losses)																		1
Net realized investment gains (losses), after tax																		—
Net income																		$	270

Three months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	678		$	716		$	206		$	135		$	—		$	(1	)	$	1,734
Net investment income	117			146			13			195			4			—			475
Non-insurance warranty revenue	98			—			—			—			—			—			98
Other revenues	—			9			(1		)	—			1			—			9
Total operating revenues	893			871			218			330			5			(1		)	2,316
Claims, benefits and expenses
Net incurred claims and benefits	394			426			129			328			(2		)	—			1,275
Policyholders’ dividends	1			4			—			—			—			—			5
Amortization of deferred acquisition costs	147			120			45			—			—			—			312
Non-insurance warranty expense	72			—			—			—			—			—			72
Other insurance related expenses	71			129			31			32			(1		)	(1		)	261
Other expenses	11			10			(1		)	1			50			—			71
Total claims, benefits and expenses	696			689			204			361			47			(1		)	1,996
Core income (loss) before income tax	197			182			14			(31		)	(42		)	—			320
Income tax (expense) benefit on core income (loss)	(66		)	(62		)	(4		)	36			15			—			(81		)
Core income (loss)	$	131		$	120		$	10		$	5		$	(27	)	$	—		239
Net realized investment gains (losses)																			50
Income tax (expense) benefit on net realized investment gains (losses)																			(17		)
Net realized investment gains (losses), after tax																			33
Net income																			$	272

Six months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,355		$	1,496		$	484		$	265		$	—		$	—		$	3,600
Net investment income	252			306			29			398			11			—			996
Non-insurance warranty revenue	486			—			—			—			—			—			486
Other revenues	1			16			(1		)	1			—			(1		)	16
Total operating revenues	2,094			1,818			512			664			11			(1		)	5,098
Claims, benefits and expenses
Net incurred claims and benefits	751			938			308			630			27			—			2,654
Policyholders’ dividends	2			10			—			—			—			—			12
Amortization of deferred acquisition costs	294			248			113			—			—			—			655
Non-insurance warranty expense	441			—			—			—			—			—			441
Other insurance related expenses	134			253			66			60			—			—			513
Other expenses	23			21			3			3			109			(1		)	158
Total claims, benefits and expenses	1,645			1,470			490			693			136			(1		)	4,433
Core income (loss) before income tax	449			348			22			(29		)	(125		)	—			665
Income tax (expense) benefit on core income (loss)	(95		)	(72		)	(6		)	33			26			—			(114		)
Core income (loss)	$	354		$	276		$	16		$	4		$	(99	)	$	—		551
Net realized investment gains (losses)																			11
Income tax (expense) benefit on net realized investment gains (losses)																			(1		)
Net realized investment gains (losses), after tax																			10
Net income																			$	561

June 30, 2018
(In millions)
Reinsurance receivables	$	926	$	695	$	265	$	433	$	2,245	$	—		$	4,564
Insurance receivables	996		1,311		327		8		—		—			2,642
Deferred acquisition costs	317		248		108		—		—		—			673
Goodwill	117		—		30		—		—		—			147
Insurance reserves
Claim and claim adjustment expenses	5,816		8,599		1,706		3,522		2,347		—			21,990
Unearned premiums	2,103		1,608		564		136		—		(1		)	4,410
Future policy benefits	—		—		—		10,667		—		—			10,667

Six months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,332		$	1,377		$	403		$	268		$	—		$	(1	)	$	3,379
Net investment income	265			329			25			392			9			—			1,020
Non-insurance warranty revenue	191			—			—			—			—			—			191
Other revenues	1			18			(1		)	1			1			—			20
Total operating revenues	1,789			1,724			427			661			10			(1		)	4,610
Claims, benefits and expenses
Net incurred claims and benefits	794			849			244			658			19			—			2,564
Policyholders’ dividends	2			7			—			—			—			—			9
Amortization of deferred acquisition costs	289			237			91			—			—			—			617
Non-insurance warranty expense	142			—			—			—			—			—			142
Other insurance related expenses	138			257			58			64			(1		)	(1		)	515
Other expenses	21			25			(7		)	3			94			—			136
Total claims, benefits and expenses	1,386			1,375			386			725			112			(1		)	3,983
Core income (loss) before income tax	403			349			41			(64		)	(102		)	—			627
Income tax (expense) benefit on core income (loss)	(135		)	(118		)	(11		)	73			38			—			(153		)
Core income (loss)	$	268		$	231		$	30		$	9		$	(64	)	$	—		474
Net realized investment gains (losses)																			86
Income tax (expense) benefit on net realized investment gains (losses)																			(28		)
Net realized investment gains (losses), after tax																			58
Net income																			$	532

December 31, 2017
(In millions)
Reinsurance receivables	$	671	$	654	$	212	$	438	$	2,315	$	—	$	4,290
Insurance receivables	969		1,103		254		8		2		—		2,336
Deferred acquisition costs	318		223		93		—		—		—		634
Goodwill	117		—		31		—		—		—		148
Insurance reserves
Claim and claim adjustment expenses	5,669		8,764		1,636		3,499		2,436		—		22,004
Unearned premiums	2,020		1,409		472		128		—		—		4,029
Future policy benefits	—		—		—		11,179		—		—		11,179

The following table presents operating revenue by line of business for each reportable segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Specialty
Management & Professional Liability	$	627		$	620		$	1,251		$	1,258
Surety	145			136			274			260
Warranty & Alternative Risks(1)	289			137			569			271
Specialty revenues	1,061			893			2,094			1,789
Commercial
Middle Market	521			469			1,025			937
Small Business	120			126			239			222
Other Commercial Insurance	277			276			554			565
Commercial revenues	918			871			1,818			1,724
International
Canada	63			52			121			103
CNA Europe	91			79			179			151
Hardy	108			87			212			173
International revenues	262			218			512			427
Life & Group revenues	329			330			664			661
Corporate & Other revenues	5			5			11			10
Eliminations	—			(1		)	(1		)	(1		)
Total operating revenues	2,575			2,316			5,098			4,610
Net realized investment gains (losses)	(1		)	50			11			86
Total revenues	$	2,574		$	2,366		$	5,109		$	4,696

(1) As of January 1, 2018, the Company adopted ASU 2014-09 Revenue Recognition (Topic 606): Revenue from Contracts with Customers. See Note A to the Condensed Consolidated Financial Statements for additional information.

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Non-Insurance Revenues from Contracts with Customers

6 Months Ended

Jun. 30, 2017

Revenue from Contract with Customer [Abstract]

Non-Insurance Revenues from Contracts with Customers

Non-Insurance Revenues from Contracts with Customers

Non-Insurance revenue is recognized when obligations under the terms of a contract with a customer are satisfied; generally this occurs over time as obligations are fulfilled. Revenue is measured as the amount of consideration the Company expects to receive in exchange for providing services.

Deferred Non-Insurance Warranty Revenue

Non-insurance warranty revenue is primarily generated from separately-priced service contracts that provide mechanical breakdown and other coverages to vehicle or consumer goods owners. The warranty contracts generally provide coverage from 1 month to 10 years. For warranty products in which the Company acts as the principal in the transaction, Non-insurance warranty revenues are reported on a gross basis, with amounts billed to customers reported as Non-insurance warranty revenue and commissions paid to agents reported as Non-insurance warranty expense. Non-insurance warranty revenue is reported net of any premiums related to contractual liability coverage issued by the Company's insurance operations. Additionally, the Company provides warranty administration services for dealer and manufacturer obligor warranty products, which include limited warranties and guaranteed automobile protection waivers.

The Company recognizes Non-insurance warranty revenues over the service period in proportion to the actuarially determined expected claims emergence pattern. Customers pay in full at the inception of the warranty contract. A liability for deferred revenue is recorded when cash payments are received or due in advance of the Company's performance. The deferred revenue balance includes amounts which are refundable on a pro rata basis upon cancellation.

The Company had deferred non-insurance warranty revenue balances of $2.9 billion and $3.2 billion reported in Other liabilities as of January 1, 2018 and June 30, 2018. The increase in the deferred revenue balance for the six months ended June 30, 2018 was primarily driven by cash payments received or due in advance of satisfying the Company's performance obligations, offset by cancellations and revenues recognized during the period. For the three and six months ended June 30, 2018, the Company recognized $213 million and $435 million of revenues that were included in the deferred revenue balance as of January 1, 2018. For the three and six months ended June 30, 2018, Non-insurance warranty revenue recognized from performance obligations related to prior periods due to a change in estimate was not material. The Company expects to recognize approximately $493 million of the deferred revenue in the remainder of 2018, $825 million in 2019, $656 million in 2020, and $1.2 billion thereafter.

Cost to Obtain and Fulfill Non-Insurance Warranty Contracts with Customers

Dealers, retailers and agents earn commission for assisting the Company in obtaining non-insurance warranty contracts. Additionally, the Company utilizes a third-party to perform warranty administrator services for its consumer good warranties. These costs are deferred and recorded as Other assets. These costs are amortized to Non-insurance warranty expense consistent with how the related revenue is recognized.

A premium deficiency arises to the extent that estimated future costs associated with these contracts exceed unrecognized revenue. The Company evaluates deferred costs for recoverability as part of our premium deficiency assessment. Anticipated investment income is considered in the determination of the recoverability of deferred costs. If necessary, adjustments to deferred costs and a premium deficiency reserve, if any, are recorded in current period results of operations. No premium deficiency was recognized in the six months ended June 30, 2018.

As of June 30, 2018, capitalized commission costs were $2.3 billion and capitalized administrator service costs were $19 million. For the three and six months ended June 30, 2018, the amount of amortization of capitalized costs was $164 million and $321 million and there was no impairment loss related to the costs capitalized.

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General (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Consolidation

The accompanying Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, including certain financial statement notes, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in CNAF's Annual Report on Form 10-K filed with the Securities and Exchange Commission for the year ended December 31, 2017, including the summary of significant accounting policies in Note A.

Use of Estimates

The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Recently Adopted Accounting Standards Updates (ASU)

Recently Adopted Accounting Standards Updates (ASU)

ASU 2014-09: In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue Recognition (Topic 606): Revenue from Contracts with Customers. The standard excludes from its scope the accounting for insurance contracts, financial instruments, and certain other agreements that are governed under other GAAP guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in an amount that reflects the consideration the entity is entitled to receive for the transfer of the promised goods or services.

On January 1, 2018, the Company adopted the updated guidance using the modified retrospective method applied to all contracts which were not completed as of the date of adoption, with the cumulative effect recognized as an adjustment to the opening balance of Retained earnings. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Under the new guidance, revenue on warranty products and services will be recognized more slowly compared to the historic revenue recognition pattern. In addition, for warranty products in which the Company acts as the principal in the transaction, Non-insurance warranty revenue and Non-insurance warranty expense are increased to reflect the gross amount paid by consumers, including the retail seller’s markup which is considered a commission to the Company's agent. This gross-up of revenue and expense also resulted in an increase to Other assets and Other liabilities on the Company's Condensed Consolidated Balance Sheets as the revenue and expense are recognized over the actuarially determined expected claims emergence pattern.

The cumulative effect changes to the Condensed Consolidated Balance Sheet for the adoption of the updated guidance on January 1, 2018 were as follows:

(In millions)	Balance as of December 31, 2017		Adjustments Due to Adoption of Topic 606			Balance as of January 1, 2018
Other assets	$	1,133	$	1,882		$	3,015
Other liabilities	4,253		1,969			6,222
Deferred income taxes	137		21			158
Retained earnings	9,414		(66		)	9,348

The impact of adoption on the Condensed Consolidated Statements of Operations and Balance Sheet was as follows:

Periods ended June 30, 2018	Three Months									Six Months
	Prior to Adoption			Effect of Adoption			As Reported			Prior to Adoption			Effect of Adoption			As Reported
(In millions)
Statement of operations:
Non-insurance warranty revenue	$	105		$	143		$	248		$	206		$	280		$	486
Total revenues	2,431			143			2,574			4,829			280			5,109
Non-insurance warranty expense	80			145			225			158			283			441
Total claims, benefits and expenses	2,099			145			2,244			4,150			283			4,433
Income before income tax	332			(2		)	330			679			(3		)	676
Income tax expense	(61		)	1			(60		)	(116		)	1			(115		)
Net income	271			(1		)	270			563			(2		)	561
Balance sheet(1) at June 30, 2018:
Other assets										$	3,228		$	198		$	3,426
Other liabilities										6,466			201			6,667
Deferred income taxes										295			1			296
Retained earnings										9,218			(2		)	9,216

(1) The Prior to Adoption amounts presented include the cumulative effect adjustment at adoption.

See Note J to the Condensed Consolidated Financial Statements for additional information regarding non-insurance revenues from contracts with customers.

ASU 2016-01: 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 updated accounting guidance requires changes to the reporting model for financial instruments. The guidance primarily changes the model for equity securities by requiring changes in the fair value of equity securities (except those accounted for under the equity method of accounting, those without readily determinable fair values and those that result in consolidation of the investee) to be recognized through the income statement. The Company adopted the updated guidance on January 1, 2018 and recognized a cumulative effect adjustment that increased beginning Retained earnings by $28 million, net of tax. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

For the three and six months ended June 30, 2018, the Company recognized $10 million and $25 million in pretax losses within Net realized investment gains (losses) for the change in fair value of non-redeemable preferred stock and $2 million and $2 million in pretax gains within Net investment income for the change in fair value of common stock as a result of this change. For the three and six months ended June 30, 2017, there was less than a $1 million decrease and a $1 million decrease in the fair value of common stock and a $2 million increase and a $7 million increase in the fair value of non-redeemable preferred stock recognized in Other comprehensive income. The Company's non-redeemable preferred stock contain characteristics of debt securities, are priced similarly to bonds, and are held primarily for income generation through periodic dividends. While recognition of gains and losses on these securities are no longer discretionary, management does not consider the changes in fair value of non-redeemable preferred stock to be reflective of our primary operations. As such, the changes in the fair value of these securities are recorded through Net realized investments gains (losses). The company owns certain common stock with the intention of holding the securities primarily for market appreciation and as such, the changes in the fair value of these securities are recorded through Net investment income.

ASU 2017-07: In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The updated accounting guidance requires changes to the presentation of the components of net periodic benefit cost on the income statement by requiring service cost to be presented with other employee compensation costs and other components of net periodic pension cost to be presented outside of any subtotal of operating income. The ASU also stipulates that only the service cost component of net benefit cost is eligible for capitalization. The Company adopted the updated guidance effective January 1, 2018. The guidance was applied on a prospective basis for capitalization of service costs and on a retrospective basis for the presentation of the service cost and other components of net periodic benefit costs in the Company's Condensed Consolidated Statements of Operations and in its disclosures. The Company expanded the related footnote disclosure, Note G to the Condensed Consolidated Financial Statements, to disclose the amount of service cost and non-service cost components of net periodic benefit cost and the line items in the Condensed Consolidated Statements of Operations in which such amounts are reported. The change limiting the costs eligible for capitalization is not material to the Company’s results of operations or financial position.

ASU 2018-02: In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. GAAP requires the remeasurement of deferred tax assets and liabilities due to a change in the tax rate to be included in Net income, even if the related income tax effects were originally recognized in Accumulated other comprehensive income (AOCI). The ASU allows a reclassification from AOCI to Retained earnings for stranded tax effects resulting from the new U.S. Federal corporate income tax rate enacted on December 22, 2017. The Company early adopted the updated guidance effective January 1, 2018 and elected to reclassify the stranded income tax effects relating to the reduction in the Federal corporate income tax rate from AOCI to Retained earnings at the beginning of the period of adoption. The net impact of the accounting change resulted in a $12 million increase in AOCI and a corresponding decrease in Retained earnings. The $12 million increase in AOCI is comprised of a $142 million increase in net unrealized gains (losses) on investments partially offset by a $130 million decrease in unrecognized pension and postretirement benefits.

The Company releases tax effects from AOCI utilizing the security-by-security approach for Net unrealized gains (losses) on investments with Other-than-temporary impairment (OTTI) losses and Net unrealized gains (losses) on other investments. For Pension and postretirement benefits, tax effects from AOCI are released at enacted tax rates based on the pre-tax adjustments to pension liabilities or assets recognized within OCI.

Accounting Standards Pending Adoption

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842): Accounting for Leases. The updated accounting guidance requires lessees to recognize on the balance sheet assets and liabilities for the rights and obligations created by the majority of leases, including those historically accounted for as operating leases. The guidance is effective for interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statements. It is expected that assets and liabilities will increase based on the present value of remaining lease payments for leases in place at the adoption date; however, this is not expected to be material to the Company's results of operations or financial position.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurementof Credit Losses on Financial Instruments. The updated accounting guidance requires changes to the recognition of credit losses on financial instruments not accounted for at fair value through net income. The guidance is effective for interim and annual periods beginning after December 15, 2019. The Company is currently evaluating the effect the guidance will have on the Company's financial statements, but expects the primary changes to be the use of the expected credit loss model for its mortgage loan portfolio and reinsurance receivables and the use of the allowance method rather than the write-down method for credit losses within the available-for-sale fixed maturities portfolio. The expected credit loss model will require a financial asset to be presented at the net amount expected to be collected. The allowance method for available-for-sale debt securities will allow the Company to record reversals of credit losses if the estimate of credit losses declines.

Income Tax Reform Update

On December 22, 2017, H.R.1, “An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018,” was signed into law (Tax Reform Legislation).

Shortly after enactment, the Securities and Exchange Commission Staff issued Staff Accounting Bulletin No. 118 (SAB 118) to provide guidance on accounting for the Tax Reform Legislation impacts when the measurements of the income tax effects are complete, incomplete, or incomplete but for which a provisional amount can be estimated. SAB 118 permits the recognition of provisional amounts, and adjustments to provisional amounts, in subsequent reporting periods within the one year measurement period.

The Company has reflected the following incomplete but reasonably estimated provisional items in Deferred income taxes on the Condensed Consolidated Balance Sheet at June 30, 2018. The effects of the adjustments to the Company’s provisional amounts for the three and six months ended June 30, 2018 did not impact income tax expense.

• The Company has recalculated its insurance reserves and the transition adjustment from existing law.

• The Company has recalculated amounts under special accounting method provisions for recognizing income for Federal income tax purposes no later than for financial accounting purposes and the transition adjustment from existing law.

• The Company has not recorded current or deferred taxes with respect to the international provisions since it does not expect to have inclusions in U.S. taxable income for certain earnings of foreign subsidiaries in future years.

Earnings (Loss) Per Share

Earnings (loss) per share is based on the weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.

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General (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Impact of Adoption on the Condensed Consolidated Statement of Operations and Balance Sheet

The cumulative effect changes to the Condensed Consolidated Balance Sheet for the adoption of the updated guidance on January 1, 2018 were as follows:

(In millions)	Balance as of December 31, 2017		Adjustments Due to Adoption of Topic 606			Balance as of January 1, 2018
Other assets	$	1,133	$	1,882		$	3,015
Other liabilities	4,253		1,969			6,222
Deferred income taxes	137		21			158
Retained earnings	9,414		(66		)	9,348

The impact of adoption on the Condensed Consolidated Statements of Operations and Balance Sheet was as follows:

Periods ended June 30, 2018	Three Months									Six Months
	Prior to Adoption			Effect of Adoption			As Reported			Prior to Adoption			Effect of Adoption			As Reported
(In millions)
Statement of operations:
Non-insurance warranty revenue	$	105		$	143		$	248		$	206		$	280		$	486
Total revenues	2,431			143			2,574			4,829			280			5,109
Non-insurance warranty expense	80			145			225			158			283			441
Total claims, benefits and expenses	2,099			145			2,244			4,150			283			4,433
Income before income tax	332			(2		)	330			679			(3		)	676
Income tax expense	(61		)	1			(60		)	(116		)	1			(115		)
Net income	271			(1		)	270			563			(2		)	561
Balance sheet(1) at June 30, 2018:
Other assets										$	3,228		$	198		$	3,426
Other liabilities										6,466			201			6,667
Deferred income taxes										295			1			296
Retained earnings										9,218			(2		)	9,216

(1) The Prior to Adoption amounts presented include the cumulative effect adjustment at adoption.

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Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Net investment income

The significant components of Net investment income are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Fixed maturity securities	$	444		$	457		$	890		$	912
Equity securities	12			2			22			3
Limited partnership investments	40			16			70			106
Mortgage loans	14			8			25			15
Short term investments	6			3			12			6
Trading portfolio	3			4			5			6
Other	3			—			3			1
Gross investment income	522			490			1,027			1,049
Investment expense	(16		)	(15		)	(31		)	(29		)
Net investment income	$	506		$	475		$	996		$	1,020

Net realized investment gains (losses)

Net realized investment gains (losses) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	37		$	56		$	106		$	105
Gross realized losses	(33		)	(12		)	(84		)	(29		)
Net realized investment gains (losses) on fixed maturity securities	4			44			22			76
Equity securities	(10		)	—			(25		)	—
Derivatives	4			(3		)	9			(2		)
Short term investments and other	1			9			5			12
Net realized investment gains (losses)	$	(1	)	$	50		$	11		$	86

Components of net other than temporary impairment losses recognized in earnings by asset type

The components of OTTI losses recognized in earnings by asset type are presented in the following table.

Periods ended June 30	Three Months				Six Months
(In millions)	2018		2017		2018		2017
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	—	$	2	$	5	$	4
Asset-backed	—		—		1		—
OTTI losses recognized in earnings	$	—	$	2	$	6	$	4

Summary of fixed maturity and equity securities

The following tables present a summary of fixed maturity and equity securities.

June 30, 2018 (1)	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,883	$	938	$	203	$	18,618	$	—
States, municipalities and political subdivisions	10,856		1,161		8		12,009		—
Asset-backed:
Residential mortgage-backed	4,961		72		85		4,948		(25		)
Commercial mortgage-backed	2,082		23		33		2,072		—
Other asset-backed	1,557		9		9		1,557		—
Total asset-backed	8,600		104		127		8,577		(25		)
U.S. Treasury and obligations of government-sponsored enterprises	127		3		3		127		—
Foreign government	436		6		5		437		—
Redeemable preferred stock	9		1		—		10		—
Total fixed maturity securities available-for-sale	37,911		2,213		346		39,778		$	(25	)
Total fixed maturity securities trading	17						17
Total fixed maturity securities	$	37,928	$	2,213	$	346	$	39,795

December 31, 2017	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,210	$	1,625	$	28	$	18,807	$	—
States, municipalities and political subdivisions	12,478		1,551		2		14,027		(11		)
Asset-backed:
Residential mortgage-backed	5,043		109		32		5,120		(27		)
Commercial mortgage-backed	1,840		46		14		1,872		—
Other asset-backed	1,083		16		5		1,094		—
Total asset-backed	7,966		171		51		8,086		(27		)
U.S. Treasury and obligations of government-sponsored enterprises	111		2		4		109		—
Foreign government	437		9		2		444		—
Redeemable preferred stock	10		1		—		11		—
Total fixed maturity securities available-for-sale	38,212		3,359		87		41,484		$	(38	)
Total fixed maturity securities trading	3						3
Equity securities available-for-sale:
Common stock	21		7		1		27
Preferred stock	638		31		1		668
Total equity securities available-for-sale	659		38		2		695
Total fixed maturity and equity securities	$	38,874	$	3,397	$	89	$	42,182

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

Securities in a gross unrealized loss position

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
June 30, 2018 (1)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	6,963	$	192	$	193	$	11	$	7,156	$	203
States, municipalities and political subdivisions	723		8		3		—		726		8
Asset-backed:
Residential mortgage-backed	3,183		68		344		17		3,527		85
Commercial mortgage-backed	913		16		228		17		1,141		33
Other asset-backed	632		6		27		3		659		9
Total asset-backed	4,728		90		599		37		5,327		127
U.S. Treasury and obligations of government-sponsored enterprises	49		1		19		2		68		3
Foreign government	178		3		40		2		218		5
Total	$	12,641	$	294	$	854	$	52	$	13,495	$	346

	Less than 12 Months				12 Months or Longer				Total
December 31, 2017	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	1,354	$	21	$	168	$	7	$	1,522	$	28
States, municipalities and political subdivisions	72		1		85		1		157		2
Asset-backed:
Residential mortgage-backed	1,228		5		947		27		2,175		32
Commercial mortgage-backed	403		4		212		10		615		14
Other asset-backed	248		3		18		2		266		5
Total asset-backed	1,879		12		1,177		39		3,056		51
U.S. Treasury and obligations of government-sponsored enterprises	49		2		21		2		70		4
Foreign government	166		2		4		—		170		2
Total fixed maturity securities available-for-sale	3,520		38		1,455		49		4,975		87
Equity securities available-for-sale:
Common stock	7		1		—		—		7		1
Preferred stock	93		1		—		—		93		1
Total equity securities available-for-sale	100		2		—		—		100		2
Total	$	3,620	$	40	$	1,455	$	49	$	5,075	$	89

(1) As of January 1, 2018, the Company adopted ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The change in fair value of equity securities is now recognized through the income statement. See Note A to the Condensed Consolidated Financial Statements for additional information.

Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of June 30, 2018 and 2017 and for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Beginning balance of credit losses on fixed maturity securities	$	25		$	32		$	27		$	36
Reductions for securities sold during the period	(4		)	(2		)	(6		)	(6		)
Ending balance of credit losses on fixed maturity securities	$	21		$	30		$	21		$	30

Contractual maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

	June 30, 2018				December 31, 2017
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,301	$	1,322	$	1,135	$	1,157
Due after one year through five years	8,211		8,421		8,165		8,501
Due after five years through ten years	16,138		16,240		16,060		16,718
Due after ten years	12,261		13,795		12,852		15,108
Total	$	37,911	$	39,778	$	38,212	$	41,484

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Fair Value (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the U.S. Treasury, government-sponsored enterprises and foreign governments and redeemable preferred stock.

June 30, 2018								Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2			Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	166	$	18,949		$	94	$	19,209
States, municipalities and political subdivisions	—		12,008			1		12,009
Asset-backed	—		8,304			273		8,577
Total fixed maturity securities	166		39,261			368		39,795
Equity securities:
Common stock	85		—			4		89
Non-redeemable preferred stock	67		604			13		684
Total equity securities	152		604			17		773
Short term and other	167		1,050			—		1,217
Total assets	$	485	$	40,915		$	385	$	41,785
Liabilities
Other liabilities	$	—	$	(4	)	$	—	$	(4	)
Total liabilities	$	—	$	(4	)	$	—	$	(4	)

December 31, 2017							Total Assets/Liabilities at Fair Value
(In millions)	Level 1		Level 2		Level 3
Assets
Fixed maturity securities:
Corporate bonds and other	$	128	$	19,148	$	98	$	19,374
States, municipalities and political subdivisions	—		14,026		1		14,027
Asset-backed	—		7,751		335		8,086
Total fixed maturity securities	128		40,925		434		41,487
Equity securities:
Common stock	23		—		4		27
Non-redeemable preferred stock	68		584		16		668
Total equity securities	91		584		20		695
Short term and other	396		958		—		1,354
Total assets	$	615	$	42,467	$	454	$	43,536
Liabilities
Other liabilities	$	—	$	3	$	—	$	3
Total liabilities	$	—	$	3	$	—	$	3

Table of reconciliation for assets and liablities measured at fair value on a recurring basis using significant unobservable inputs

The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of April 1, 2018	$	100		$	1	$	279		$	18		$	—	$	398
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		—			(1		)	—		(1		)
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(1		)	—			—		(2		)
Total realized and unrealized investment gains (losses)	(1		)	—		(1		)	(1		)	—		(3		)
Purchases	2			—		41			—			—		43
Sales	(5		)	—		—			—			—		(5		)
Settlements	(2		)	—		(6		)	—			—		(8		)
Transfers into Level 3	—			—		13			—			—		13
Transfers out of Level 3	—			—		(53		)	—			—		(53		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(1	)	$	—	$	(1	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Life settlement contracts			Total
Balance as of April 1, 2017	$	121		$	1	$	256		$	19		$	—	$	46		$	443
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			—		—			1
Reported in Other revenues	—			—		—			—			—		—			—
Reported in Other comprehensive income	—			—		1			1			—		—			2
Total realized and unrealized investment gains (losses)	—			—		2			1			—		—			3
Purchases	—			—		13			—			—		—			13
Sales	—			—		—			(1		)	—		(45		)	(46		)
Settlements	(11		)	—		(7		)	—			—		—			(18		)
Transfers into Level 3	—			—		24			—			—		—			24
Transfers out of Level 3	(10		)	—		(70		)	—			—		—			(80		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—	$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—	$	—		$	—

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments		Total
Balance as of January 1, 2018	$	98		$	1	$	335		$	20		$	—	$	454
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	(1		)	—		7			(3		)	—		3
Reported in Net investment income	—			—		—			—			—		—
Reported in Other comprehensive income	(1		)	—		(6		)	—			—		(7		)
Total realized and unrealized investment gains (losses)	(2		)	—		1			(3		)	—		(4		)
Purchases	2			—		71			—			—		73
Sales	(5		)	—		(72		)	—			—		(77		)
Settlements	(4		)	—		(12		)	—			—		(16		)
Transfers into Level 3	5			—		13			—			—		18
Transfers out of Level 3	—			—		(63		)	—			—		(63		)
Balance as of June 30, 2018	$	94		$	1	$	273		$	17		$	—	$	385
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2018 recognized in Net income (loss)	$	—		$	—	$	—		$	(3	)	$	—	$	(3	)

Level 3 (In millions)	Corporate bonds and other			States, municipalities and political subdivisions		Asset-backed			Equity securities			Derivative financial instruments			Life settlement contracts			Total
Balance as of January 1, 2017	$	130		$	1	$	199		$	19		$	—		$	58		$	407
Total realized and unrealized investment gains (losses):
Reported in Net realized investment gains (losses)	—			—		1			—			1			—			2
Reported in Other revenues	—			—		—			—			—			6			6
Reported in Other comprehensive income	1			—		3			2			—			—			6
Total realized and unrealized investment gains (losses)	1			—		4			2			1			6			14
Purchases	5			—		51			1			—			—			57
Sales	(1		)	—		—			(3		)	(1		)	(58		)	(63		)
Settlements	(25		)	—		(13		)	—			—			(5		)	(43		)
Transfers into Level 3	—			—		52			—			—			—			52
Transfers out of Level 3	(10		)	—		(75		)	—			—			—			(85		)
Balance as of June 30, 2017	$	100		$	1	$	218		$	19		$	—		$	1		$	339
Unrealized gains (losses) on Level 3 assets and liabilities held as of June 30, 2017 recognized in Net income (loss)	$	—		$	—	$	—		$	—		$	—		$	—		$	—

Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets

The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company.

June 30, 2018	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	130	Discounted cash flow	Credit spread	1% - 12% (3%)

December 31, 2017	Estimated Fair Value (In millions)		Valuation Technique(s)	Unobservable Input(s)	Range  (Weighted Average)
Fixed maturity securities	$	136	Discounted cash flow	Credit spread	1% - 12% (3%)

Carrying amount and estimated fair value of financial instrument assets and liabilities not measured at fair value

The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables.

June 30, 2018	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	865	$	—	$	—	$	850	$	850
Note receivable	34		—		—		34		34
Liabilities
Short term debt	$	30	$	—	$	30	$	—	$	30
Long term debt	2,679		—		2,754		—		2,754

December 31, 2017	Carrying Amount		Estimated Fair Value
(In millions)			Level 1		Level 2		Level 3		Total
Assets
Mortgage loans	$	839	$	—	$	—	$	844	$	844
Note receivable	46		—		—		46		46
Liabilities
Short term debt	$	150	$	—	$	150	$	—	$	150
Long term debt	2,708		—		2,896		—		2,896

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Claim and Claim Adjustment Expense Reserves (Tables)

6 Months Ended

Jun. 30, 2018

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Schedule of liability for unpaid claims and claims adjustment expense

The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of the Life & Group segment.

For the six months ended June 30
(In millions)	2018			2017
Reserves, beginning of year:
Gross	$	22,004		$	22,343
Ceded	3,934			4,094
Net reserves, beginning of year	18,070			18,249
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	2,552			2,443
Decrease in provision for insured events of prior years	(112		)	(159		)
Amortization of discount	92			93
Total net incurred (1)	2,532			2,377
Net payments attributable to:
Current year events	(312		)	(266		)
Prior year events	(2,387		)	(2,331		)
Total net payments	(2,699		)	(2,597		)
Foreign currency translation adjustment and other	(70		)	70
Net reserves, end of period	17,833			18,099
Ceded reserves, end of period	4,157			4,080
Gross reserves, end of period	$	21,990		$	22,179

(1) Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits which are not reflected in the table above.

Net prior year development

The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Specialty	$	(44	)	$	(23	)	$	(74	)	$	(35	)
Commercial	(13		)	(34		)	(22		)	(77		)
International	(2		)	2			(2		)	—
Corporate & Other	—			—			—			—
Total pretax (favorable) unfavorable development	$	(59	)	$	(55	)	$	(98	)	$	(112	)

Specialty

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the development recorded for the Specialty segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Medical Professional Liability	$	3		$	2		$	23		$	22
Other Professional Liability and Management Liability	(34		)	(37		)	(68		)	(69		)
Surety	(15		)	—			(30		)	—
Warranty	(6		)	6			(6		)	6
Other	8			6			7			6
Total pretax (favorable) unfavorable development	$	(44	)	$	(23	)	$	(74	)	$	(35	)

Commercial

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the development recorded for the Commercial segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Commercial Auto	$	—		$	1		$	(1	)	$	(25	)
General Liability	26			1			18			(17		)
Workers' Compensation	(6		)	(47		)	(12		)	(47		)
Property and Other	(33		)	11			(27		)	12
Total pretax (favorable) unfavorable development	$	(13	)	$	(34	)	$	(22	)	$	(77	)

International

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Net prior year claim and allocated claim adjustment expense reserve development

The following table presents further detail of the development recorded for the International segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Pretax (favorable) unfavorable development:
Casualty	$	(6	)	$	1		$	(6	)	$	1
Property	12			(10		)	12			(11		)
Energy and Marine	(5		)	(3		)	(5		)	(3		)
Specialty	9			16			9			15
Healthcare and Technology	(12		)	(2		)	(12		)	(2		)
Total pretax (favorable) unfavorable development	$	(2	)	$	2		$	(2	)	$	—

CNAF Consolidated

Net Incurred Claim and Claim Adjustment Expense [Line Items]

Impact of loss portfolio transfer on the consolidated statement of operations

The following table presents the impact of the Loss Portfolio Transfer on the Condensed Consolidated Statements of Operations.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Additional amounts ceded under LPT:
Net A&EP adverse development before consideration of LPT	$	—		$	—		$	113		$	60
Provision for uncollectible third-party reinsurance on A&EP	—			—			(16		)	—
Total additional amounts ceded under LPT	—			—			97			60
Retroactive reinsurance benefit recognized	(15		)	(3		)	(72		)	(43		)
Pretax impact of deferred retroactive reinsurance	$	(15	)	$	(3	)	$	25		$	17

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Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Components of net periodic cost (benefit)

The components of net periodic pension cost (benefit) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Net periodic pension cost (benefit)
Service cost	$	—		$	—		$	—		$	—
Non-service cost:
Interest cost on projected benefit obligation	24			26			47			52
Expected return on plan assets	(40		)	(39		)	(80		)	(78		)
Amortization of net actuarial loss	9			9			18			18
Settlement loss	1			—			5			2
Total non-service cost	(6		)	(4		)	(10		)	(6		)
Total net periodic pension cost (benefit)	$	(6	)	$	(4	)	$	(10	)	$	(6	)

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Accumulated Other Comprehensive Income (Loss) by Component (Tables)

6 Months Ended

Jun. 30, 2018

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

Accumulated Other Comprehensive Income (Loss) by Component

The tables below display the changes in Accumulated other comprehensive income (loss) by component.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2018	$	21		$	430		$	(765	)	$	(86	)	$	(400	)
Other comprehensive income (loss) before reclassifications	(1		)	(156		)	—			(52		)	(209		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(1), $2, $- and $1	—			3			(7		)	—			(4		)
Other comprehensive income (loss) net of tax (expense) benefit of $1, $46, $(2), $- and $45	(1		)	(159		)	7			(52		)	(205		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of April 1, 2017	$	26		$	709	$	(640	)	$	(187	)	$	(92	)
Other comprehensive income (loss) before reclassifications	(1		)	108		—			42			149
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $1, $(15), $3, $-, and $(11)	(1		)	31		(5		)	—			25
Other comprehensive income (loss) net of tax (expense) benefit of $-, $(48), $(3), $- and $(51)	—			77		5			42			124
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments			Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2018, as previously reported	$	25		$	750		$	(645	)	$	(98	)	$	32
Cumulative effect adjustment from accounting change for adoption of ASU 2018-02(1)	5			137			(130		)	—			12
Cumulative effect adjustment from accounting change for adoption of ASU 2016-01(1) net of tax (expense) benefit of $-, $8, $-, $- and $8	—			(28		)	—			—			(28		)
Balance as of January 1, 2018, as adjusted	30			859			(775		)	(98		)	16
Other comprehensive income (loss) before reclassifications	(11		)	(570		)	—			(40		)	(621		)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $-, $(5), $5, $- and $-	(1		)	18			(17		)	—			—
Other comprehensive income (loss) net of tax (expense) benefit of $3, $155, $(5), $- and $153	(10		)	(588		)	17			(40		)	(621		)
Balance as of June 30, 2018	$	20		$	271		$	(758	)	$	(138	)	$	(605	)

(1) See Note A to the Condensed Consolidated Financial Statements for additional information.

(In millions)	Net unrealized gains (losses) on investments with OTTI losses			Net unrealized gains (losses) on other investments		Pension and postretirement benefits			Cumulative foreign currency translation adjustment			Total
Balance as of January 1, 2017	$	30		$	642	$	(647	)	$	(198	)	$	(173	)
Other comprehensive income (loss) before reclassifications	(1		)	193		—			53			245
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $(1), $(24), $7, $- and $(18)	3			49		(12		)	—			40
Other comprehensive income (loss) net of tax (expense) benefit of $1, $(86), $(7), $- and $(92)	(4		)	144		12			53			205
Balance as of June 30, 2017	$	26		$	786	$	(635	)	$	(145	)	$	32

Reclassification out of Accumulated Other Comprehensive Income

Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows:

Component of AOCI	Condensed Consolidated Statements of Operations Line Item Affected by Reclassifications
Net unrealized gains (losses) on investments with OTTI losses	Net realized investment gains (losses)
Net unrealized gains (losses) on other investments	Net realized investment gains (losses)
Pension and postretirement benefits	Other operating expenses and Insurance claims and policyholders' benefits

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Business Segments (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Significant components of the Company's continuing operations and selected balance sheet items

The Company's results of operations and selected balance sheet items by segment are presented in the following tables.

Three months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations		Total
Operating revenues
Net earned premiums	$	683		$	753		$	248		$	131		$	—		$	—	$	1,815
Net investment income	130			157			15			198			6			—		506
Non-insurance warranty revenue	248			—			—			—			—			—		248
Other revenues	—			8			(1		)	—			(1		)	—		6
Total operating revenues	1,061			918			262			329			5			—		2,575
Claims, benefits and expenses
Net incurred claims and benefits	372			470			166			327			(14		)	—		1,321
Policyholders’ dividends	1			5			—			—			—			—		6
Amortization of deferred acquisition costs	149			127			83			—			—			—		359
Non-insurance warranty expense	225			—			—			—			—			—		225
Other insurance related expenses	70			126			10			30			—			—		236
Other expenses	12			10			7			1			67			—		97
Total claims, benefits and expenses	829			738			266			358			53			—		2,244
Core income (loss) before income tax	232			180			(4		)	(29		)	(48		)	—		331
Income tax (expense) benefit on core income (loss)	(49		)	(37		)	(3		)	19			9			—		(61		)
Core income (loss)	$	183		$	143		$	(7	)	$	(10	)	$	(39	)	$	—	270
Net realized investment gains (losses)																		(1		)
Income tax (expense) benefit on net realized investment gains (losses)																		1
Net realized investment gains (losses), after tax																		—
Net income																		$	270

Three months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	678		$	716		$	206		$	135		$	—		$	(1	)	$	1,734
Net investment income	117			146			13			195			4			—			475
Non-insurance warranty revenue	98			—			—			—			—			—			98
Other revenues	—			9			(1		)	—			1			—			9
Total operating revenues	893			871			218			330			5			(1		)	2,316
Claims, benefits and expenses
Net incurred claims and benefits	394			426			129			328			(2		)	—			1,275
Policyholders’ dividends	1			4			—			—			—			—			5
Amortization of deferred acquisition costs	147			120			45			—			—			—			312
Non-insurance warranty expense	72			—			—			—			—			—			72
Other insurance related expenses	71			129			31			32			(1		)	(1		)	261
Other expenses	11			10			(1		)	1			50			—			71
Total claims, benefits and expenses	696			689			204			361			47			(1		)	1,996
Core income (loss) before income tax	197			182			14			(31		)	(42		)	—			320
Income tax (expense) benefit on core income (loss)	(66		)	(62		)	(4		)	36			15			—			(81		)
Core income (loss)	$	131		$	120		$	10		$	5		$	(27	)	$	—		239
Net realized investment gains (losses)																			50
Income tax (expense) benefit on net realized investment gains (losses)																			(17		)
Net realized investment gains (losses), after tax																			33
Net income																			$	272

Six months ended June 30, 2018	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,355		$	1,496		$	484		$	265		$	—		$	—		$	3,600
Net investment income	252			306			29			398			11			—			996
Non-insurance warranty revenue	486			—			—			—			—			—			486
Other revenues	1			16			(1		)	1			—			(1		)	16
Total operating revenues	2,094			1,818			512			664			11			(1		)	5,098
Claims, benefits and expenses
Net incurred claims and benefits	751			938			308			630			27			—			2,654
Policyholders’ dividends	2			10			—			—			—			—			12
Amortization of deferred acquisition costs	294			248			113			—			—			—			655
Non-insurance warranty expense	441			—			—			—			—			—			441
Other insurance related expenses	134			253			66			60			—			—			513
Other expenses	23			21			3			3			109			(1		)	158
Total claims, benefits and expenses	1,645			1,470			490			693			136			(1		)	4,433
Core income (loss) before income tax	449			348			22			(29		)	(125		)	—			665
Income tax (expense) benefit on core income (loss)	(95		)	(72		)	(6		)	33			26			—			(114		)
Core income (loss)	$	354		$	276		$	16		$	4		$	(99	)	$	—		551
Net realized investment gains (losses)																			11
Income tax (expense) benefit on net realized investment gains (losses)																			(1		)
Net realized investment gains (losses), after tax																			10
Net income																			$	561

June 30, 2018
(In millions)
Reinsurance receivables	$	926	$	695	$	265	$	433	$	2,245	$	—		$	4,564
Insurance receivables	996		1,311		327		8		—		—			2,642
Deferred acquisition costs	317		248		108		—		—		—			673
Goodwill	117		—		30		—		—		—			147
Insurance reserves
Claim and claim adjustment expenses	5,816		8,599		1,706		3,522		2,347		—			21,990
Unearned premiums	2,103		1,608		564		136		—		(1		)	4,410
Future policy benefits	—		—		—		10,667		—		—			10,667

Six months ended June 30, 2017	Specialty			Commercial			International			Life & Group			Corporate & Other
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,332		$	1,377		$	403		$	268		$	—		$	(1	)	$	3,379
Net investment income	265			329			25			392			9			—			1,020
Non-insurance warranty revenue	191			—			—			—			—			—			191
Other revenues	1			18			(1		)	1			1			—			20
Total operating revenues	1,789			1,724			427			661			10			(1		)	4,610
Claims, benefits and expenses
Net incurred claims and benefits	794			849			244			658			19			—			2,564
Policyholders’ dividends	2			7			—			—			—			—			9
Amortization of deferred acquisition costs	289			237			91			—			—			—			617
Non-insurance warranty expense	142			—			—			—			—			—			142
Other insurance related expenses	138			257			58			64			(1		)	(1		)	515
Other expenses	21			25			(7		)	3			94			—			136
Total claims, benefits and expenses	1,386			1,375			386			725			112			(1		)	3,983
Core income (loss) before income tax	403			349			41			(64		)	(102		)	—			627
Income tax (expense) benefit on core income (loss)	(135		)	(118		)	(11		)	73			38			—			(153		)
Core income (loss)	$	268		$	231		$	30		$	9		$	(64	)	$	—		474
Net realized investment gains (losses)																			86
Income tax (expense) benefit on net realized investment gains (losses)																			(28		)
Net realized investment gains (losses), after tax																			58
Net income																			$	532

December 31, 2017
(In millions)
Reinsurance receivables	$	671	$	654	$	212	$	438	$	2,315	$	—	$	4,290
Insurance receivables	969		1,103		254		8		2		—		2,336
Deferred acquisition costs	318		223		93		—		—		—		634
Goodwill	117		—		31		—		—		—		148
Insurance reserves
Claim and claim adjustment expenses	5,669		8,764		1,636		3,499		2,436		—		22,004
Unearned premiums	2,020		1,409		472		128		—		—		4,029
Future policy benefits	—		—		—		11,179		—		—		11,179

Revenues by line of business

The following table presents operating revenue by line of business for each reportable segment.

Periods ended June 30	Three Months						Six Months
(In millions)	2018			2017			2018			2017
Specialty
Management & Professional Liability	$	627		$	620		$	1,251		$	1,258
Surety	145			136			274			260
Warranty & Alternative Risks(1)	289			137			569			271
Specialty revenues	1,061			893			2,094			1,789
Commercial
Middle Market	521			469			1,025			937
Small Business	120			126			239			222
Other Commercial Insurance	277			276			554			565
Commercial revenues	918			871			1,818			1,724
International
Canada	63			52			121			103
CNA Europe	91			79			179			151
Hardy	108			87			212			173
International revenues	262			218			512			427
Life & Group revenues	329			330			664			661
Corporate & Other revenues	5			5			11			10
Eliminations	—			(1		)	(1		)	(1		)
Total operating revenues	2,575			2,316			5,098			4,610
Net realized investment gains (losses)	(1		)	50			11			86
Total revenues	$	2,574		$	2,366		$	5,109		$	4,696

(1) As of January 1, 2018, the Company adopted ASU 2014-09 Revenue Recognition (Topic 606): Revenue from Contracts with Customers. See Note A to the Condensed Consolidated Financial Statements for additional information.

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General (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains (losses) on investments		$ (160)	$ 77	$ (598)	$ 140
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax						$ (50)	$ 0
Accumulated Other Comprehensive (Loss) Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax						(16)	$ 0
ASU 2016-01 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax	$ 28
ASU 2016-01 | Accumulated Other Comprehensive (Loss) Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax						(28)
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains (losses) on investments	142
Decrease in unrecognized pension and postretirement benefits	130
ASU 2018-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax	(12)
ASU 2018-02 | Accumulated Other Comprehensive (Loss) Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments from changes in accounting guidance, net of tax	$ 12					$ 12
Loews | CNAF Consolidated
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Noncontrolling interest, ownership percentage by parent		89.00%		89.00%
Preferred stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Realized gains (losses) on equity securities		$ (10)		$ (25)
Preferred stock | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Realized gains (losses) on equity securities		(10)		(25)
Change in fair value of equity securities recognized in other comprehensive income			2		7
Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Realized gains (losses) on equity securities		2		1
Common Stock | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Realized gains (losses) on equity securities		$ 2		$ 2
Change in fair value of equity securities recognized in other comprehensive income			$ (1)		$ (1)

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General (Impact of Adoption on Condensed Balance Sheet and Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Statement of operations:
Non-insurance warranty revenue	$ 248	$ 98	$ 486	$ 191
Total revenues	2,574	2,366	5,109	4,696
Non-insurance warranty expense	225	72	441	142
Total claims, benefits and expenses	2,244	1,996	4,433	3,983
Income before income tax	330	370	676	713
Income tax expense	(60)	(98)	(115)	(181)
Net income	270	$ 272	561	$ 532
Balance sheets:
Other assets	3,426		3,426		$ 3,015	$ 1,133
Other liabilities	6,667		6,667		6,222	4,253
Deferred income taxes	296		296		158	137
Retained earnings	9,216		9,216		9,348	9,414
Prior to Adoption
Statement of operations:
Non-insurance warranty revenue	105		206
Total revenues	2,431		4,829
Non-insurance warranty expense	80		158
Total claims, benefits and expenses	2,099		4,150
Income before income tax	332		679
Income tax expense	(61)		(116)
Net income	271		563
Balance sheets:
Other assets	3,228		3,228			1,133
Other liabilities	6,466		6,466			4,253
Deferred income taxes	295		295			137
Retained earnings	9,218		9,218			$ 9,414
Effect of Adoption
Statement of operations:
Non-insurance warranty revenue	143		280
Total revenues	143		280
Non-insurance warranty expense	145		283
Total claims, benefits and expenses	145		283
Income before income tax	(2)		(3)
Income tax expense	1		1
Net income	(1)		(2)
Balance sheets:
Other assets	198		198		1,882
Other liabilities	201		201		1,969
Deferred income taxes	1		1		21
Retained earnings	$ (2)		$ (2)		$ (66)

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Earnings (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	835	847	929	915
Antidilutive securities excluded from computation of earnings per share (in shares)	445	1	2	1

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Investments (Net investment income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Investment Income [Line Items]
Gross investment income	$ 522	$ 490	$ 1,027	$ 1,049
Investment expense	(16)	(15)	(31)	(29)
Net investment income	506	475	996	1,020
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	444	457	890	912
Equity securities
Net Investment Income [Line Items]
Gross investment income	12	2	22	3
Limited partnership investments
Net Investment Income [Line Items]
Gross investment income	40	16	70	106
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	14	8	25	15
Short term investments
Net Investment Income [Line Items]
Gross investment income	6	3	12	6
Trading portfolio
Net Investment Income [Line Items]
Gross investment income	3	4	5	6
Other
Net Investment Income [Line Items]
Gross investment income	$ 3	$ 0	$ 3	$ 1

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Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Net Investment Income [Line Items]
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments	$ 1,186	$ 1,186	$ 1,411
Derivative, notional amount	161	161	167
Derivative fair value	4	4
Derivative fair value			$ (3)
Future capital call commitments for limited partnership investments	551	551
Mortgage loan commitments	15	15
Commitments to purchase or fund privately placed debt securities	272	272
Commitments to sell various privately placed debt securities	111	111
Common Stock
Net Investment Income [Line Items]
Net investment income (losses)	2	1
Preferred stock
Net Investment Income [Line Items]
Net investment income (losses)	$ (10)	$ (25)

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Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Net realized investment (losses) gains	$ (1)	$ 50	$ 11	$ 86
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	37		106
Gross realized gains		56		105
Gross realized losses	(33)		(84)
Gross realized losses		(12)		(29)
Net realized investment gains (losses) on fixed maturity securities	4		22
Net realized investment (losses) gains		44		76
Equity securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment (losses) gains		0		0
Equity securities	(10)		(25)
Derivatives
Debt Securities, Available-for-sale [Line Items]
Derivatives	4	(3)	9	(2)
Short term investments and other
Debt Securities, Available-for-sale [Line Items]
Short term investments and other	$ 1	$ 9	$ 5	$ 12

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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]
OTTI losses recognized in earnings	$ 0	$ 2	$ 6	$ 4
Corporate and other bonds
Debt Securities, Available-for-sale [Line Items]
OTTI losses recognized in earnings	0	2	5	4
Asset-backed
Debt Securities, Available-for-sale [Line Items]
OTTI losses recognized in earnings	$ 0	$ 0	$ 1	$ 0

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Investments (Summary of fixed maturity and equity securities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Cost or Amortized Cost	$ 37,911	$ 38,212
Gross Unrealized Gains	2,213
Gross Unrealized Losses	346
Estimated Fair Value	39,778	41,484
Cost or Amortized Cost	37,928
Estimated Fair Value	39,795
Cost or Amortized Cost		38,874
Gross Unrealized Gains		3,397
Gross Unrealized Losses		89
Estimated Fair Value		42,182
Corporate and other bonds
Cost or Amortized Cost	17,883
Gross Unrealized Gains	938
Gross Unrealized Losses	203
Estimated Fair Value	18,618
Cost or Amortized Cost		17,210
Gross Unrealized Gains		1,625
Gross Unrealized Losses		28
Estimated Fair Value		18,807
Unrealized OTTI Losses (Gains)	0	0
States, municipalities and political subdivisions
Cost or Amortized Cost	10,856
Gross Unrealized Gains	1,161
Gross Unrealized Losses	8
Estimated Fair Value	12,009
Cost or Amortized Cost		12,478
Gross Unrealized Gains		1,551
Gross Unrealized Losses		2
Estimated Fair Value		14,027
Unrealized OTTI Losses (Gains)	0	(11)
Residential mortgage-backed
Cost or Amortized Cost	4,961
Gross Unrealized Gains	72
Gross Unrealized Losses	85
Estimated Fair Value	4,948
Cost or Amortized Cost		5,043
Gross Unrealized Gains		109
Gross Unrealized Losses		32
Estimated Fair Value		5,120
Unrealized OTTI Losses (Gains)	(25)	(27)
Commercial mortgage-backed
Cost or Amortized Cost	2,082
Gross Unrealized Gains	23
Gross Unrealized Losses	33
Estimated Fair Value	2,072
Cost or Amortized Cost		1,840
Gross Unrealized Gains		46
Gross Unrealized Losses		14
Estimated Fair Value		1,872
Unrealized OTTI Losses (Gains)	0	0
Other asset-backed
Cost or Amortized Cost	1,557
Gross Unrealized Gains	9
Gross Unrealized Losses	9
Estimated Fair Value	1,557
Cost or Amortized Cost		1,083
Gross Unrealized Gains		16
Gross Unrealized Losses		5
Estimated Fair Value		1,094
Unrealized OTTI Losses (Gains)	0	0
Total asset-backed
Cost or Amortized Cost	8,600
Gross Unrealized Gains	104
Gross Unrealized Losses	127
Estimated Fair Value	8,577
Cost or Amortized Cost		7,966
Gross Unrealized Gains		171
Gross Unrealized Losses		51
Estimated Fair Value		8,086
Unrealized OTTI Losses (Gains)	(25)	(27)
U.S. Treasury and obligations of government-sponsored enterprises
Cost or Amortized Cost	127
Gross Unrealized Gains	3
Gross Unrealized Losses	3
Estimated Fair Value	127
Cost or Amortized Cost		111
Gross Unrealized Gains		2
Gross Unrealized Losses		4
Estimated Fair Value		109
Unrealized OTTI Losses (Gains)	0	0
Foreign government
Cost or Amortized Cost	436
Gross Unrealized Gains	6
Gross Unrealized Losses	5
Estimated Fair Value	437
Cost or Amortized Cost		437
Gross Unrealized Gains		9
Gross Unrealized Losses		2
Estimated Fair Value		444
Unrealized OTTI Losses (Gains)	0	0
Redeemable preferred stock
Cost or Amortized Cost	9
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Estimated Fair Value	10
Cost or Amortized Cost		10
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Estimated Fair Value		11
Unrealized OTTI Losses (Gains)	0	0
Fixed maturity securities
Cost or Amortized Cost	37,911
Gross Unrealized Gains	2,213
Gross Unrealized Losses	346
Estimated Fair Value	39,778
Cost or Amortized Cost		38,212
Gross Unrealized Gains		3,359
Gross Unrealized Losses		87
Estimated Fair Value		41,484
Unrealized OTTI Losses (Gains)	(25)	(38)
Total fixed maturity securities trading
Cost or Amortized Cost	17
Estimated Fair Value	$ 17
Cost or Amortized Cost		3
Estimated Fair Value		3
Common Stock
Cost or Amortized Cost		21
Gross Unrealized Gains		7
Gross Unrealized Losses		1
Estimated Fair Value		27
Preferred stock
Cost or Amortized Cost		638
Gross Unrealized Gains		31
Gross Unrealized Losses		1
Estimated Fair Value		668
Equity securities
Cost or Amortized Cost		659
Gross Unrealized Gains		38
Gross Unrealized Losses		2
Estimated Fair Value		$ 695

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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months		$ 3,620
Gross Unrealized Losses, Less than 12 Months		40
Estimated Fair Value, 12 Months or Longer		1,455
Gross Unrealized Losses, 12 Months or Longer		49
Estimated Fair Value, Total		5,075
Gross Unrealized Losses, Total		89
Corporate and other bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	$ 6,963
Gross Unrealized Losses, Less than 12 Months	192
Estimated Fair Value, 12 Months or Longer	193
Gross Unrealized Losses, 12 Months or Longer	11
Estimated Fair Value, Total	7,156
Gross Unrealized Losses, Total	203
Estimated Fair Value, Less than 12 Months		1,354
Gross Unrealized Losses, Less than 12 Months		21
Estimated Fair Value, 12 Months or Longer		168
Gross Unrealized Losses, 12 Months or Longer		7
Estimated Fair Value, Total		1,522
Gross Unrealized Losses, Total		28
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	723
Gross Unrealized Losses, Less than 12 Months	8
Estimated Fair Value, 12 Months or Longer	3
Gross Unrealized Losses, 12 Months or Longer	0
Estimated Fair Value, Total	726
Gross Unrealized Losses, Total	8
Estimated Fair Value, Less than 12 Months		72
Gross Unrealized Losses, Less than 12 Months		1
Estimated Fair Value, 12 Months or Longer		85
Gross Unrealized Losses, 12 Months or Longer		1
Estimated Fair Value, Total		157
Gross Unrealized Losses, Total		2
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	3,183
Gross Unrealized Losses, Less than 12 Months	68
Estimated Fair Value, 12 Months or Longer	344
Gross Unrealized Losses, 12 Months or Longer	17
Estimated Fair Value, Total	3,527
Gross Unrealized Losses, Total	85
Estimated Fair Value, Less than 12 Months		1,228
Gross Unrealized Losses, Less than 12 Months		5
Estimated Fair Value, 12 Months or Longer		947
Gross Unrealized Losses, 12 Months or Longer		27
Estimated Fair Value, Total		2,175
Gross Unrealized Losses, Total		32
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	913
Gross Unrealized Losses, Less than 12 Months	16
Estimated Fair Value, 12 Months or Longer	228
Gross Unrealized Losses, 12 Months or Longer	17
Estimated Fair Value, Total	1,141
Gross Unrealized Losses, Total	33
Estimated Fair Value, Less than 12 Months		403
Gross Unrealized Losses, Less than 12 Months		4
Estimated Fair Value, 12 Months or Longer		212
Gross Unrealized Losses, 12 Months or Longer		10
Estimated Fair Value, Total		615
Gross Unrealized Losses, Total		14
Other asset-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	632
Gross Unrealized Losses, Less than 12 Months	6
Estimated Fair Value, 12 Months or Longer	27
Gross Unrealized Losses, 12 Months or Longer	3
Estimated Fair Value, Total	659
Gross Unrealized Losses, Total	9
Estimated Fair Value, Less than 12 Months		248
Gross Unrealized Losses, Less than 12 Months		3
Estimated Fair Value, 12 Months or Longer		18
Gross Unrealized Losses, 12 Months or Longer		2
Estimated Fair Value, Total		266
Gross Unrealized Losses, Total		5
Total asset-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	4,728
Gross Unrealized Losses, Less than 12 Months	90
Estimated Fair Value, 12 Months or Longer	599
Gross Unrealized Losses, 12 Months or Longer	37
Estimated Fair Value, Total	5,327
Gross Unrealized Losses, Total	127
Estimated Fair Value, Less than 12 Months		1,879
Gross Unrealized Losses, Less than 12 Months		12
Estimated Fair Value, 12 Months or Longer		1,177
Gross Unrealized Losses, 12 Months or Longer		39
Estimated Fair Value, Total		3,056
Gross Unrealized Losses, Total		51
U.S. Treasury and obligations of government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	49
Gross Unrealized Losses, Less than 12 Months	1
Estimated Fair Value, 12 Months or Longer	19
Gross Unrealized Losses, 12 Months or Longer	2
Estimated Fair Value, Total	68
Gross Unrealized Losses, Total	3
Estimated Fair Value, Less than 12 Months		49
Gross Unrealized Losses, Less than 12 Months		2
Estimated Fair Value, 12 Months or Longer		21
Gross Unrealized Losses, 12 Months or Longer		2
Estimated Fair Value, Total		70
Gross Unrealized Losses, Total		4
Foreign government
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	178
Gross Unrealized Losses, Less than 12 Months	3
Estimated Fair Value, 12 Months or Longer	40
Gross Unrealized Losses, 12 Months or Longer	2
Estimated Fair Value, Total	218
Gross Unrealized Losses, Total	5
Estimated Fair Value, Less than 12 Months		166
Gross Unrealized Losses, Less than 12 Months		2
Estimated Fair Value, 12 Months or Longer		4
Gross Unrealized Losses, 12 Months or Longer		0
Estimated Fair Value, Total		170
Gross Unrealized Losses, Total		2
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	12,641
Gross Unrealized Losses, Less than 12 Months	294
Estimated Fair Value, 12 Months or Longer	854
Gross Unrealized Losses, 12 Months or Longer	52
Estimated Fair Value, Total	13,495
Gross Unrealized Losses, Total	$ 346
Estimated Fair Value, Less than 12 Months		3,520
Gross Unrealized Losses, Less than 12 Months		38
Estimated Fair Value, 12 Months or Longer		1,455
Gross Unrealized Losses, 12 Months or Longer		49
Estimated Fair Value, Total		4,975
Gross Unrealized Losses, Total		87
Common Stock
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months		7
Gross Unrealized Losses, Less than 12 Months		1
Estimated Fair Value, 12 Months or Longer		0
Gross Unrealized Losses, 12 Months or Longer		0
Estimated Fair Value, Total		7
Gross Unrealized Losses, Total		1
Preferred stock
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months		93
Gross Unrealized Losses, Less than 12 Months		1
Estimated Fair Value, 12 Months or Longer		0
Gross Unrealized Losses, 12 Months or Longer		0
Estimated Fair Value, Total		93
Gross Unrealized Losses, Total		1
Equity securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months		100
Gross Unrealized Losses, Less than 12 Months		2
Estimated Fair Value, 12 Months or Longer		0
Gross Unrealized Losses, 12 Months or Longer		0
Estimated Fair Value, Total		100
Gross Unrealized Losses, Total		$ 2

XML

Investments (Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance beginning of period	$ 25	$ 32	$ 27	$ 36
Reductions for securities sold during the period	(4)	(2)	(6)	(6)
Balance end of period	$ 21	$ 30	$ 21	$ 30

XML

Investments (Contractual maturity) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Investments [Abstract]
Due in one year or less, cost or amortized cost	$ 1,301	$ 1,135
Due after one year through five years, cost or amortized cost	8,211	8,165
Due after five years through ten years, cost or amortized cost	16,138	16,060
Due after ten years, cost or amortized cost	12,261	12,852
Cost or Amortized Cost	37,911	38,212
Due in one year or less, estimated fair value	1,322	1,157
Due after one year through five years, estimated fair value	8,421	8,501
Due after five years through ten years, estimated fair value	16,240	16,718
Due after ten years, estimated fair value	13,795	15,108
Total Estimated Fair Value	$ 39,778	$ 41,484

XML

Fair Value (Assets and liabilities measured at fair value) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	$ 39,795	$ 41,487
Equity securities	773
Equity securities		695
Short term and other	1,217	1,354
Assets	41,785	43,536
Liabilities
Other liabilities	(4)	3
Liabilities	(4)	3
Corporate and other bonds
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	19,209	19,374
States, municipalities and political subdivisions
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	12,009	14,027
Total asset-backed
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	8,577	8,086
Common Stock
Assets
Equity securities	89
Equity securities		27
Preferred stock
Assets
Equity securities	684
Equity securities		668
Level 1
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	166	128
Equity securities	152
Equity securities		91
Short term and other	167	396
Assets	485	615
Liabilities
Other liabilities	0	0
Liabilities	0	0
Level 1 | Corporate and other bonds
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	166	128
Level 1 | States, municipalities and political subdivisions
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	0	0
Level 1 | Total asset-backed
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	0	0
Level 1 | Common Stock
Assets
Equity securities	85
Equity securities		23
Level 1 | Preferred stock
Assets
Equity securities	67
Equity securities		68
Level 2
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	39,261	40,925
Equity securities	604
Equity securities		584
Short term and other	1,050	958
Assets	40,915	42,467
Liabilities
Other liabilities	(4)	3
Liabilities	(4)	3
Level 2 | Corporate and other bonds
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	18,949	19,148
Level 2 | States, municipalities and political subdivisions
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	12,008	14,026
Level 2 | Total asset-backed
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	8,304	7,751
Level 2 | Common Stock
Assets
Equity securities	0
Equity securities		0
Level 2 | Preferred stock
Assets
Equity securities	604
Equity securities		584
Level 3
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	368	434
Equity securities	17
Equity securities		20
Short term and other	0	0
Assets	385	454
Liabilities
Other liabilities	0	0
Liabilities	0	0
Level 3 | Corporate and other bonds
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	94	98
Level 3 | States, municipalities and political subdivisions
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	1	1
Level 3 | Total asset-backed
Assets
Fixed maturity securities at fair value (amortized cost of $37,928 and $38,215)	273	335
Level 3 | Common Stock
Assets
Equity securities	4
Equity securities		4
Level 3 | Preferred stock
Assets
Equity securities	$ 13
Equity securities		$ 16

XML

Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 398	$ 443	$ 454	$ 407
Reported in Net realized investment gains (losses)	(1)		3
Reported in Net investment income	0		0
Reported in Other comprehensive income	(2)	2	(7)	6
Total realized and unrealized investment gains (losses)	(3)	3	(4)	14
Purchases	43	13	73	57
Sales	(5)	(46)	(77)	(63)
Settlements	(8)	(18)	(16)	(43)
Transfers into Level 3	13	24	18	52
Transfers out of Level 3	(53)	(80)	(63)	(85)
Balance at end of period	385	339	385	339
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	(1)	0	(3)	0
Corporate and other bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	100	121	98	130
Reported in Net realized investment gains (losses)	0		(1)
Reported in Net investment income	0		0
Reported in Other comprehensive income	(1)	0	(1)	1
Total realized and unrealized investment gains (losses)	(1)	0	(2)	1
Purchases	2	0	2	5
Sales	(5)	0	(5)	(1)
Settlements	(2)	(11)	(4)	(25)
Transfers into Level 3	0	0	5	0
Transfers out of Level 3	0	(10)	0	(10)
Balance at end of period	94	100	94	100
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	0	0	0	0
States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1	1	1	1
Reported in Net realized investment gains (losses)	0		0
Reported in Net investment income	0		0
Reported in Other comprehensive income	0	0	0	0
Total realized and unrealized investment gains (losses)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	1	1	1	1
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	0	0	0	0
Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	279	256	335	199
Reported in Net realized investment gains (losses)	0		7
Reported in Net investment income	0		0
Reported in Other comprehensive income	(1)	1	(6)	3
Total realized and unrealized investment gains (losses)	(1)	2	1	4
Purchases	41	13	71	51
Sales	0	0	(72)	0
Settlements	(6)	(7)	(12)	(13)
Transfers into Level 3	13	24	13	52
Transfers out of Level 3	(53)	(70)	(63)	(75)
Balance at end of period	273	218	273	218
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	18	19	20	19
Reported in Net realized investment gains (losses)	(1)		(3)
Reported in Net investment income	0		0
Reported in Other comprehensive income	0	1	0	2
Total realized and unrealized investment gains (losses)	(1)	1	(3)	2
Purchases	0	0	0	1
Sales	0	(1)	0	(3)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	17	19	17	19
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	(1)	0	(3)	0
Derivative financial instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	0	0	0
Reported in Net realized investment gains (losses)	0		0
Reported in Net investment income	0		0
Reported in Other comprehensive income	0	0	0	0
Total realized and unrealized investment gains (losses)	0	0	0	1
Purchases	0	0	0	0
Sales	0	0	0	(1)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	0	0	0	0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)	$ 0	0	$ 0	0
Life settlement contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		46		58
Reported in Other comprehensive income		0		0
Total realized and unrealized investment gains (losses)		0		6
Purchases		0		0
Sales		(45)		(58)
Settlements		0		(5)
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Balance at end of period		1		1
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss)		0		0
Reported in Net realized investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		1		2
Reported in Net realized investment gains (losses) | Corporate and other bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Net realized investment gains (losses) | States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Net realized investment gains (losses) | Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		1		1
Reported in Net realized investment gains (losses) | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Net realized investment gains (losses) | Derivative financial instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		1
Reported in Net realized investment gains (losses) | Life settlement contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		6
Reported in Other revenues | Corporate and other bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues | States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues | Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues | Derivative financial instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		0		0
Reported in Other revenues | Life settlement contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net realized investment gains (losses)		$ 0		$ 6

XML

Fair Value (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Transfers from Level 2 to Level 1	$ 29,000,000		$ 0
Transfers from Level 1 to Level 2	0		$ 0
Other invested assets overseas deposit	$ 42,000,000	$ 39,000,000

XML

Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Estimated fair value	$ 41,785	$ 43,536
Fixed maturity securities | Discounted cash flow
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Estimated fair value	$ 130	$ 136
Fixed maturity securities | Discounted cash flow | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Credit spread	1.00%	1.00%
Fixed maturity securities | Discounted cash flow | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Credit spread	12.00%	12.00%
Fixed maturity securities | Discounted cash flow | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Credit spread	3.00%	3.00%

XML

Fair Value (Financal assets and liabilities not measure at fair value) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets
Mortgage loans	$ 865	$ 839
Liabilities
Short term debt	30	150
Long term debt	2,679	2,708
Carrying Amount
Assets
Mortgage loans	865	839
Note receivable	34	46
Liabilities
Short term debt	30	150
Long term debt	2,679	2,708
Estimated Fair Value
Assets
Mortgage loans	850	844
Note receivable	34	46
Liabilities
Short term debt	30	150
Long term debt	2,754	2,896
Level 1 | Estimated Fair Value
Assets
Mortgage loans	0	0
Note receivable	0	0
Liabilities
Short term debt	0	0
Long term debt	0	0
Level 2 | Estimated Fair Value
Assets
Mortgage loans	0	0
Note receivable	0	0
Liabilities
Short term debt	30	150
Long term debt	2,754	2,896
Level 3 | Estimated Fair Value
Assets
Mortgage loans	850	844
Note receivable	34	46
Liabilities
Short term debt	0	0
Long term debt	$ 0	$ 0

XML

Claim and Claim Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2010
Liability for Claims and Claims Adjustment Expense [Line Items]
Catastrophe losses net of reinsurance	$ 26	$ 39	$ 60	$ 73
Asbestos and Environmental Reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Net A&EP claim and allocated claim adjustment expense reserves ceded to NICO						$ 1,600
Aggregate limit under A&EP loss portfolio transfer						4,000
A&EP claim and allocated claim adjustment expense reserves ceded under existing third party reinsurance contracts transferred to NICO under A&EP loss portfolio transfer						1,200
Reinsurance premium paid to NICO under A&EP loss portfolio transfer						2,000
Net reinsurance receivables transferrred to NICO under A&EP loss portfolio transfer						215
Total consideration paid to NICO under AEP loss portfolio transfer						$ 2,200
Net A&EP adverse development before consideration of loss portfolio transfer	0	$ 0	113	$ 60
Cumulative amounts ceded under AEP loss portfolio transfer	3,000		3,000		$ 2,900
Deferred reinsurance benefit yet to be recognized	351		351		326
Fair value of collateral trust account established by NICO under A&EP loss portfolio transfer	$ 3,000		$ 3,000		$ 3,100

XML

Claim and Claim Adjustment Expense Reserves (Liability for Unpaid Claim and Claim Adjustment Expense Rollforward) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Reserves, beginning of year:
Gross		$ 22,004	$ 22,343
Ceded		3,934	4,094
Net reserves, beginning of year		18,070	18,249
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year		2,552	2,443
Decrease in provision for insured events of prior years		(112)	(159)
Amortization of discount		92	93
Total net incurred	[1]	2,532	2,377
Net payments attributable to:
Current year events		(312)	(266)
Prior year events		(2,387)	(2,331)
Total net payments		(2,699)	(2,597)
Foreign currency translation adjustment and other		(70)	70
Net reserves, end of period		17,833	18,099
Ceded reserves, end of period		4,157	4,080
Gross reserves, end of period		$ 21,990	$ 22,179

[1] Total net incurred above does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance and loss deductible receivables, and benefit expenses related to future policy benefits which are not reflected in the table above.

XML

Claim and Claim Adjustment Expense Reserves (Net prior year development) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	$ (59)	$ (55)	$ (98)	$ (112)
Specialty
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	(44)	(23)	(74)	(35)
Commercial
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	(13)	(34)	(22)	(77)
International
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	(2)	2	(2)	0
Corporate & Other
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	$ 0	$ 0	$ 0	$ 0

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Claim and Claim Adjustment Expense Reserves (Specialty - Detail of Development Recorded) (Details) - Specialty - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ (44)	$ (23)	$ (74)	$ (35)
Medical Professional Liability
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	3	2	23	22
Other Professional Liability and Management Liability
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(34)	(37)	(68)	(69)
Surety
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(15)	0	(30)	0
Warranty
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(6)	6	(6)	6
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ 8	$ 6	$ 7	$ 6

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Claim and Claim Adjustment Expense Reserves (Commercial - Detail of Develpment Recorded) (Details) - Commercial - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ (13)	$ (34)	$ (22)	$ (77)
Commercial Auto
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	0	1	(1)	(25)
General Liability
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	26	1	18	(17)
Workers' Compensation
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(6)	(47)	(12)	(47)
Property and Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ (33)	$ 11	$ (27)	$ 12

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Claim and Claim Adjustment Expense Reserves (International - Detail of Development Recorded) (Details) - International - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ (2)	$ 2	$ (2)	$ 0
Casualty
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(6)	1	(6)	1
Property
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	12	(10)	12	(11)
Energy and Marine
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	(5)	(3)	(5)	(3)
Specialty
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	9	16	9	15
Healthcare and Technology
Liability for Claims and Claims Adjustment Expense [Line Items]
Total pretax (favorable) unfavorable development	$ (12)	$ (2)	$ (12)	$ (2)

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Claim and Claim Adjustment Expense Reserves (Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations) (Details) - Asbestos and Environmental Reserves - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Additional amounts ceded under LPT:
Net A&EP adverse development before consideration of LPT	$ 0	$ 0	$ 113	$ 60
Provision for uncollectible third-party reinsurance on A&EP	0	0	(16)	0
Total additional amounts ceded under LPT	0	0	97	60
Retroactive reinsurance benefit recognized	(15)	(3)	(72)	(43)
Pretax impact of deferred retroactive reinsurance	$ (15)	$ (3)	$ 25	$ 17

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Legal Proceedings, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Guarantee Obligations
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor obligations, maximum exposure, undiscounted		$ 1,800
Insurance Premium Rate Adjustment | Multi-Peril Package Product
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Loss contingency accrual		47
Guarantee and Indemnification
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor obligations, current carrying calue		5		$ 5
Guarantee Agreement
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor obligations, maximum exposure, undiscounted		375
Indemnification Agreement
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor obligations, maximum exposure, undiscounted		252
Earned Premiums | Insurance Premium Rate Adjustment | Multi-Peril Package Product
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Adjustment for loss contingency	$ (1)		$ 37
Interest Expense | Insurance Premium Rate Adjustment | Multi-Peril Package Product
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Adjustment for loss contingency	$ 1	$ 1	$ 6

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Benefit Plans (Components of net periodic cost (benefit)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Non-service cost:
Insurance claims and policyholders’ benefits	$ 1,327	$ 1,280	$ 2,666	$ 2,573
Other operating expenses	298	292	601	568
Pension Plans, Defined Benefit
Net periodic pension cost (benefit)
Service cost	0	0	0	0
Non-service cost:
Interest cost on projected benefit obligation	24	26	47	52
Expected return on plan assets	(40)	(39)	(80)	(78)
Amortization of net actuarial loss	9	9	18	18
Settlement loss	1	0	5	2
Total non-service cost	(6)	(4)	(10)	(6)
Total net periodic pension cost (benefit)	(6)	(4)	(10)	(6)
Insurance claims and policyholders’ benefits	2	1	3	2
Other operating expenses	$ 4	$ 3	$ 7	$ 4

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Accumulated Other Comprehensive Income (Loss) by Component Schedule of Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			$ 12,244
Other comprehensive income (loss) before reclassifications	$ (209)	$ 149	(621)	$ 245
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(4)	25	0	40
Other comprehensive income (loss) after tax (expense) benefit	(205)	124	(621)	205
Total stockholder's equity at end of period	11,415	12,028	11,415	12,028
Cumulative effect on retained earnings, tax			8
Reclassification from AOCI, tax	1	(11)	0	(18)
Tax (expense) benefit on other comprehensive income (loss)	45	(51)	153	(92)
Net unrealized gains (losses) on investments with OTTI losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	21	26	30	30
Other comprehensive income (loss) before reclassifications	(1)	(1)	(11)	(1)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	(1)	(1)	3
Other comprehensive income (loss) after tax (expense) benefit	(1)	0	(10)	(4)
Total stockholder's equity at end of period	20	26	20	26
Cumulative effect on retained earnings, tax			0
Reclassification from AOCI, tax	0	1	0	(1)
Tax (expense) benefit on other comprehensive income (loss)	1	0	3	1
Net unrealized gains (losses) on other investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	430	709	859	642
Other comprehensive income (loss) before reclassifications	(156)	108	(570)	193
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	3	31	18	49
Other comprehensive income (loss) after tax (expense) benefit	(159)	77	(588)	144
Total stockholder's equity at end of period	271	786	271	786
Cumulative effect on retained earnings, tax			8
Reclassification from AOCI, tax	(1)	(15)	(5)	(24)
Tax (expense) benefit on other comprehensive income (loss)	46	(48)	155	(86)
Pension and postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(765)	(640)	(775)	(647)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(7)	(5)	(17)	(12)
Other comprehensive income (loss) after tax (expense) benefit	7	5	17	12
Total stockholder's equity at end of period	(758)	(635)	(758)	(635)
Cumulative effect on retained earnings, tax			0
Reclassification from AOCI, tax	2	3	5	7
Tax (expense) benefit on other comprehensive income (loss)	(2)	(3)	(5)	(7)
Cumulative foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(86)	(187)	(98)	(198)
Other comprehensive income (loss) before reclassifications	(52)	42	(40)	53
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0	0	0
Other comprehensive income (loss) after tax (expense) benefit	(52)	42	(40)	53
Total stockholder's equity at end of period	(138)	(145)	(138)	(145)
Cumulative effect on retained earnings, tax			0
Reclassification from AOCI, tax	0	0	0	0
Tax (expense) benefit on other comprehensive income (loss)	0	0	0	0
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(400)	(92)	16	(173)
Cumulative effect adjustments from changes in accounting guidance, net of tax						$ (16)	$ 0
Total stockholder's equity at end of period	$ (605)	$ 32	(605)	32
ASU 2018-02 | Net unrealized gains (losses) on investments with OTTI losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						5
ASU 2018-02 | Net unrealized gains (losses) on other investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						137
ASU 2018-02 | Pension and postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						(130)
ASU 2018-02 | Cumulative foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						0
ASU 2018-02 | Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax					$ 12	12
ASU 2016-01 | Net unrealized gains (losses) on investments with OTTI losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						0
ASU 2016-01 | Net unrealized gains (losses) on other investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						(28)
ASU 2016-01 | Pension and postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						0
ASU 2016-01 | Cumulative foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						0
ASU 2016-01 | Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect adjustments from changes in accounting guidance, net of tax						$ (28)
Previously reported | Net unrealized gains (losses) on investments with OTTI losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			25
Previously reported | Net unrealized gains (losses) on other investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			750
Previously reported | Pension and postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			(645)
Previously reported | Cumulative foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			(98)
Previously reported | Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period			$ 32	$ (173)

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Business Segments (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018 segments
Core Segments - Specialty, Commercial and International
Segment Reporting Information [Line Items]
Number of operating segments	3
Non-Core Segments, Life & Group Non-Core and Corporate and Other Non-Core
Segment Reporting Information [Line Items]
Number of operating segments	2

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Business Segments (Income Statement Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues
Net earned premiums	$ 1,815	$ 1,734	$ 3,600	$ 3,379
Net investment income	506	475	996	1,020
Non-insurance warranty revenue	248	98	486	191
Other revenues	6	9	16	20
Total operating revenues	2,575	2,316	5,098	4,610
Claims, Benefits and Expenses
Net incurred claims and benefits	1,321	1,275	2,654	2,564
Policyholders’ dividends	6	5	12	9
Amortization of deferred acquisition costs	359	312	655	617
Non-insurance warranty expense	225	72	441	142
Other insurance related expenses	236	261	513	515
Other expenses	97	71	158	136
Total claims, benefits and expenses	2,244	1,996	4,433	3,983
Core income (loss) before income tax	331	320	665	627
Income tax (expense) benefit on core income (loss)	(61)	(81)	(114)	(153)
Core income (loss)	270	239	551	474
Net realized investment gains (losses)	(1)	50	11	86
Income tax (expense) benefit on net realized investment gains (losses)	1	(17)	(1)	(28)
Net realized investment gains (losses), after tax	0	33	10	58
Net income	270	272	561	532
Operating Segments | Specialty
Operating revenues
Net earned premiums	683	678	1,355	1,332
Net investment income	130	117	252	265
Non-insurance warranty revenue	248	98	486	191
Other revenues	0	0	1	1
Total operating revenues	1,061	893	2,094	1,789
Claims, Benefits and Expenses
Net incurred claims and benefits	372	394	751	794
Policyholders’ dividends	1	1	2	2
Amortization of deferred acquisition costs	149	147	294	289
Non-insurance warranty expense	225	72	441	142
Other insurance related expenses	70	71	134	138
Other expenses	12	11	23	21
Total claims, benefits and expenses	829	696	1,645	1,386
Core income (loss) before income tax	232	197	449	403
Income tax (expense) benefit on core income (loss)	(49)	(66)	(95)	(135)
Core income (loss)	183	131	354	268
Operating Segments | Commercial
Operating revenues
Net earned premiums	753	716	1,496	1,377
Net investment income	157	146	306	329
Non-insurance warranty revenue	0	0	0	0
Other revenues	8	9	16	18
Total operating revenues	918	871	1,818	1,724
Claims, Benefits and Expenses
Net incurred claims and benefits	470	426	938	849
Policyholders’ dividends	5	4	10	7
Amortization of deferred acquisition costs	127	120	248	237
Non-insurance warranty expense	0	0	0	0
Other insurance related expenses	126	129	253	257
Other expenses	10	10	21	25
Total claims, benefits and expenses	738	689	1,470	1,375
Core income (loss) before income tax	180	182	348	349
Income tax (expense) benefit on core income (loss)	(37)	(62)	(72)	(118)
Core income (loss)	143	120	276	231
Operating Segments | International
Operating revenues
Net earned premiums	248	206	484	403
Net investment income	15	13	29	25
Non-insurance warranty revenue	0	0	0	0
Other revenues	(1)	(1)	(1)	(1)
Total operating revenues	262	218	512	427
Claims, Benefits and Expenses
Net incurred claims and benefits	166	129	308	244
Policyholders’ dividends	0	0	0	0
Amortization of deferred acquisition costs	83	45	113	91
Non-insurance warranty expense	0	0	0	0
Other insurance related expenses	10	31	66	58
Other expenses	7	(1)	3	(7)
Total claims, benefits and expenses	266	204	490	386
Core income (loss) before income tax	(4)	14	22	41
Income tax (expense) benefit on core income (loss)	(3)	(4)	(6)	(11)
Core income (loss)	(7)	10	16	30
Operating Segments | Life & Group revenues
Operating revenues
Net earned premiums	131	135	265	268
Net investment income	198	195	398	392
Non-insurance warranty revenue	0	0	0	0
Other revenues	0	0	1	1
Total operating revenues	329	330	664	661
Claims, Benefits and Expenses
Net incurred claims and benefits	327	328	630	658
Policyholders’ dividends	0	0	0	0
Amortization of deferred acquisition costs	0	0	0	0
Non-insurance warranty expense	0	0	0	0
Other insurance related expenses	30	32	60	64
Other expenses	1	1	3	3
Total claims, benefits and expenses	358	361	693	725
Core income (loss) before income tax	(29)	(31)	(29)	(64)
Income tax (expense) benefit on core income (loss)	19	36	33	73
Core income (loss)	(10)	5	4	9
Operating Segments | Corporate & Other
Operating revenues
Net earned premiums	0	0	0	0
Net investment income	6	4	11	9
Non-insurance warranty revenue	0	0	0	0
Other revenues	(1)	1	0	1
Total operating revenues	5	5	11	10
Claims, Benefits and Expenses
Net incurred claims and benefits	(14)	(2)	27	19
Policyholders’ dividends	0	0	0	0
Amortization of deferred acquisition costs	0	0	0	0
Non-insurance warranty expense	0	0	0	0
Other insurance related expenses	0	(1)	0	(1)
Other expenses	67	50	109	94
Total claims, benefits and expenses	53	47	136	112
Core income (loss) before income tax	(48)	(42)	(125)	(102)
Income tax (expense) benefit on core income (loss)	9	15	26	38
Core income (loss)	(39)	(27)	(99)	(64)
Eliminations
Operating revenues
Net earned premiums	0	(1)	0	(1)
Net investment income	0	0	0	0
Non-insurance warranty revenue	0	0	0	0
Other revenues	0	0	(1)	0
Total operating revenues	0	(1)	(1)	(1)
Claims, Benefits and Expenses
Net incurred claims and benefits	0	0	0	0
Policyholders’ dividends	0	0	0	0
Amortization of deferred acquisition costs	0	0	0	0
Non-insurance warranty expense	0	0	0	0
Other insurance related expenses	0	(1)	0	(1)
Other expenses	0	0	(1)	0
Total claims, benefits and expenses	0	(1)	(1)	(1)
Core income (loss) before income tax	0	0	0	0
Income tax (expense) benefit on core income (loss)	0	0	0	0
Core income (loss)	$ 0	$ 0	$ 0	$ 0

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Business Segments (Balance Sheet Information) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Reinsurance receivables	$ 4,564	$ 4,290
Insurance receivables	2,642	2,336
Deferred acquisition costs	673	634
Goodwill	147	148
Insurance reserves
Claim and claim adjustment expenses	21,990	22,004
Unearned premiums	4,410	4,029
Future policy benefits	10,667	11,179
Operating Segments | Specialty
Segment Reporting Information [Line Items]
Reinsurance receivables	926	671
Insurance receivables	996	969
Deferred acquisition costs	317	318
Goodwill	117	117
Insurance reserves
Claim and claim adjustment expenses	5,816	5,669
Unearned premiums	2,103	2,020
Future policy benefits	0	0
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Reinsurance receivables	695	654
Insurance receivables	1,311	1,103
Deferred acquisition costs	248	223
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	8,599	8,764
Unearned premiums	1,608	1,409
Future policy benefits	0	0
Operating Segments | International
Segment Reporting Information [Line Items]
Reinsurance receivables	265	212
Insurance receivables	327	254
Deferred acquisition costs	108	93
Goodwill	30	31
Insurance reserves
Claim and claim adjustment expenses	1,706	1,636
Unearned premiums	564	472
Future policy benefits	0	0
Operating Segments | Life & Group revenues
Segment Reporting Information [Line Items]
Reinsurance receivables	433	438
Insurance receivables	8	8
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	3,522	3,499
Unearned premiums	136	128
Future policy benefits	10,667	11,179
Operating Segments | Corporate & Other
Segment Reporting Information [Line Items]
Reinsurance receivables	2,245	2,315
Insurance receivables	0	2
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	2,347	2,436
Unearned premiums	0	0
Future policy benefits	0	0
Eliminations
Segment Reporting Information [Line Items]
Reinsurance receivables	0	0
Insurance receivables	0	0
Deferred acquisition costs	0	0
Goodwill	0	0
Insurance reserves
Claim and claim adjustment expenses	0	0
Unearned premiums	(1)	0
Future policy benefits	$ 0	$ 0

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Business Segments (Revenues by Line of Business) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 2,574	$ 2,366	$ 5,109	$ 4,696
Net realized investment gains (losses)	(1)	50	11	86
Operating Segments | Specialty
Revenues	1,061	893	2,094	1,789
Operating Segments | Commercial
Revenues	918	871	1,818	1,724
Operating Segments | International
Revenues	262	218	512	427
Operating Segments | Life & Group revenues
Revenues	329	330	664	661
Operating Segments | Corporate & Other revenues
Revenues	5	5	11	10
Eliminations
Revenues	0	(1)	(1)	(1)
Operating segments and eliminations, excluding segment reconciling Items
Revenues	2,575	2,316	5,098	4,610
Management & Professional Liability | Operating Segments | Specialty
Revenues	627	620	1,251	1,258
Surety | Operating Segments | Specialty
Revenues	145	136	274	260
Warranty & Alternative Risks | Operating Segments | Specialty
Revenues	289	137	569	271
Middle Market | Operating Segments | Commercial
Revenues	521	469	1,025	937
Small Business | Operating Segments | Commercial
Revenues	120	126	239	222
Other Commercial Insurance | Operating Segments | Commercial
Revenues	277	276	554	565
Canada | Operating Segments | International
Revenues	63	52	121	103
CNA Europe | Operating Segments | International
Revenues	91	79	179	151
Hardy | Operating Segments | International
Revenues	$ 108	$ 87	$ 212	$ 173

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Non-Insurance Revenues from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Unearned revenue associated with outstanding non-insurance warrany product and service contracts	$ 3,200	$ 3,200	$ 2,900
Contract with customer, liability, revenue recognized	213	435
Amortization of deferred sales commissions	164	$ 321
Minimum
Disaggregation of Revenue [Line Items]
Warranty contract duration		1 month
Maximum
Disaggregation of Revenue [Line Items]
Warranty contract duration		10 years
Capitalized Commission Costs
Disaggregation of Revenue [Line Items]
Capitalized commission costs	2,300	$ 2,300
Capitalized Administrator Service Costs
Disaggregation of Revenue [Line Items]
Capitalized commission costs	$ 19	$ 19

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Non-Insurance Revenues from Contracts with Customers (Recognition of Deferred Revenue Schedule) (Details) $ in Millions	Jun. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 493
Performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 825
Performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 656
Performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 1,200
Performance period