Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities:
Net income	$ 464	$ 427
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense	57	78
Amortization of other intangible assets	53	51
Other non-cash adjustments for depreciation, amortization and accretion	107	55
Gains related to investment securities, net	(2)	(11)
Change in trading account assets, net	(17)	(66)
Change in accrued income receivable	(133)	(144)
Change in collateral deposits, net	(321)	(195)
Change in unrealized losses on foreign exchange derivatives, net	72	461
Change in other assets, net	639	478
Change in trading liabilities, net	0	34
Change in accrued expenses and other liabilities, net	(846)	(514)
Other, net	40	(31)
Net cash provided by operating activities	113	623
Investing Activities:
Net decrease in interest-bearing deposits with banks	11,539	32,177
Net increase in securities purchased under resale agreements	(3,687)	(850)
Proceeds from sales of available-for-sale securities	2,750	1,087
Proceeds from maturities of available-for-sale securities	9,723	10,790
Purchases of available-for-sale securities	(8,240)	(14,884)
Proceeds from maturities of available-for-sale securities	437	765
Purchases of held-to-maturity securities	(2,570)	(2)
Net increase in loans	(1,702)	(2,230)
Purchases of equity investments and other long-term assets	(51)	(11)
Purchases of premises and equipment	(119)	(85)
Other, net	36	26
Net cash provided by investing activities	8,116	26,783
Financing Activities:
Net decrease in time deposits	(10,218)	(5,720)
Net increase (decrease) in all other deposits	812	(21,387)
Net increase (decrease) in short-term borrowings	3,555	(1,177)
Payments for long-term debt and obligations under capital leases	(7)	(6)
Proceeds related to common stock awards and option exercises	329	238
Purchases of common stock	(360)	0
Repurchases of common stock for employee tax withholding	(112)	(69)
Payments for cash dividends	(110)	(95)
Net cash used in financing activities	(6,111)	(28,216)
Net increase (decrease)	2,118	(810)
Cash and due from banks at beginning of period	2,590	2,193
Cash and due from banks at end of period	$ 4,708	$ 1,383