CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$ 164us-gaap_NetIncomeLoss	$ 104us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37	32
Provision for credit losses	53us-gaap_ProvisionForLoanAndLeaseLosses	16us-gaap_ProvisionForLoanAndLeaseLosses
Other-than-temporary impairment related to securities held-to-maturity	0us-gaap_ImpairmentOfInvestments	2us-gaap_ImpairmentOfInvestments
Net realized gains on securities available-for-sale	(23)	(22)
Net change in other assets and liabilities	650	743
Net change in loans held for sale:
Originations of loans	(760)	(374)
Sales and collection of loans held for sale	758	385
Net change in trading assets and liabilities	1,772	32
Lower of amortized cost or fair value adjustments on loans held for sale	6us-gaap_OtherNoncashIncomeExpense	(1)us-gaap_OtherNoncashIncomeExpense
Gain on instruments designated at fair value and related derivatives	(85)	(28)
Net cash provided by operating activities	2,572	889
Cash flows from investing activities
Net change in interest bearing deposits with banks	(1,442)	(3,852)
Net change in federal funds sold and securities purchased under agreements to resell	(5,552)	767
Securities available-for-sale:
Purchases of securities available-for-sale	(8,509)	(5,783)
Proceeds from sales of securities available-for-sale	5,491	6,855
Proceeds from maturities of securities available-for-sale	236	701
Securities held-to-maturity:
Purchases of securities held-to-maturity	(1,105)	0
Proceeds from maturities of securities held-to-maturity	554	75
Change in loans:
Originations, net of collections	(3,652)	(2,014)
Loans sold to third parties	98	11
Net cash used for acquisitions of properties and equipment	(6)	(5)
Other, net	(209)	0
Net cash used in investing activities	(14,096)	(3,245)
Cash flows from financing activities
Net change in deposits	2,919us-gaap_IncreaseDecreaseInDeposits	(7,147)us-gaap_IncreaseDecreaseInDeposits
Debt:
Net change in short-term borrowings	2,858	9,632
Issuance of long-term debt	8,943	767
Repayment of long-term debt	(7,101)us-gaap_RepaymentsOfLongTermDebt	(690)us-gaap_RepaymentsOfLongTermDebt
Capital contribution from parent	4,000	0
Other increases in capital surplus	4	6
Dividends paid	(18)	(18)
Net cash provided by financing activities	11,605	2,550
Net change in cash and due from banks	81	194
Cash and due from banks at beginning of period	891us-gaap_CashAndDueFromBanks	961us-gaap_CashAndDueFromBanks
Cash and due from banks at end of period	$ 972us-gaap_CashAndDueFromBanks	$ 1,155us-gaap_CashAndDueFromBanks

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Fair value changes on fixed rate debt, loans and certain other financial instruments accounted for under fair value option as well as the fair value changes on the related derivatives and realized gains (losses) on the debt related derivatives.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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The cash flow from the funds lent to and (borrowed from) other financial reporting institutions arising from excess or shortfall in reserve deposited at the Federal Reserve Bank to meet legal requirements. This lending and borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash outflow or inflow from investments purchased under the agreement to resell such investment.

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- Definition

The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 230

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

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- Definition

The cash inflow from sale proceeds and collection of repayments from borrowers on loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization; includes mortgages and other types of loans.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-SubTopic 10

-Section 45

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-Topic 310

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4600-111522

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Name Accounting Standards Codification

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-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from Sales of Loans Held For Investment.

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-Topic 230

-SubTopic 10

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Article 9

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-Subparagraph (SX 210.9-04.11)

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-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

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