Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 409us-gaap_NetIncomeLoss	$ 363us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense	0us-gaap_DeferredIncomeTaxExpenseBenefit	(34)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of other intangible assets	50us-gaap_AmortizationOfIntangibleAssets	54us-gaap_AmortizationOfIntangibleAssets
Other non-cash adjustments for depreciation, amortization and accretion, net	135	99
Losses (gains) related to investment securities, net	1us-gaap_MarketableSecuritiesGainLoss	(6)us-gaap_MarketableSecuritiesGainLoss
Change in trading account assets, net	(221)	(46)
Change in accrued interest and fees receivable, net	(39)	(74)
Change in collateral deposits, net	(3,199)	(419)
Change in unrealized losses (gains) on foreign exchange derivatives, net	563	267
Change in other assets, net	1,528	34
Change in accrued expenses and other liabilities, net	982	1,542
Other, net	188us-gaap_OtherNoncashIncomeExpense	126us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities	397	1,906
Investing Activities:
Net decrease (increase) in interest-bearing deposits with banks	10,125	(11,539)
Net (increase) decrease in securities purchased under resale agreements	(8,941)	143
Proceeds from sales of available-for-sale securities	1,656	1,816
Proceeds from maturities of available-for-sale securities	6,467	8,733
Purchases of available-for-sale securities	(10,979)	(10,377)
Proceeds from maturities of available-for-sale securities	993	669
Purchases of held-to-maturity securities	(2)	(1,157)
Net increase in loans	(111)	(2,628)
Purchases of equity investments and other long-term assets	(114)	(82)
Purchases of premises and equipment	(96)	(110)
Other, net	11	18
Net cash used in investing activities	(991)	(14,514)
Financing Activities:
Net decrease in time deposits	(2,224)us-gaap_IncreaseDecreaseInTimeDeposits	(1,084)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in all other deposits	4,536us-gaap_IncreaseDecreaseInOtherDeposits	13,464us-gaap_IncreaseDecreaseInOtherDeposits
Net increase in short-term borrowings	1,194	1,030
Payments for long-term debt and obligations under capital leases	(915)	(257)
Proceeds from issuance of preferred stock	0	742
Proceeds from exercises of common stock options	4	9
Purchases of common stock	(470)	(420)
Excess tax benefit related to stock-based compensation	34	41
Repurchases of common stock for employee tax withholding	(115)	(140)
Payments for cash dividends	(156)us-gaap_PaymentsOfDividends	(120)us-gaap_PaymentsOfDividends
Net cash provided by financing activities	1,888	13,265
Net increase	1,294	657
Cash and due from banks at beginning of period	1,855us-gaap_CashAndDueFromBanks	3,220us-gaap_CashAndDueFromBanks
Cash and due from banks at end of period	$ 3,149us-gaap_CashAndDueFromBanks	$ 3,877us-gaap_CashAndDueFromBanks

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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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.

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

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

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