Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities:
Net income	$ 1,591	$ 1,539
Adjustments to reconcile net income to net cash provided by operating activities:
Claims resolution	362	0
Deferred income tax benefit	(44)	(96)
Amortization of other intangible assets	145	149
Other non-cash adjustments for depreciation, amortization and accretion	279	116
Gains related to investment securities, net	(2)	(25)
Change in trading account assets, net	96	(1,297)
Change in accrued income receivable	(111)	(199)
Change in collateral deposits, net	(1,216)	(1,919)
Change in unrealized (gains) losses on foreign exchange derivatives, net	483	(169)
Change in other assets, net	26	(1,170)
Change in trading liabilities, net	0	785
Change in accrued expenses and other liabilities, net	(1,341)	2,183
Other, net	52	328
Net cash (used in) provided by operating activities	(404)	225
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	27,303	(14,250)
Net increase in securities purchased under resale agreements	(1,219)	(3,130)
Proceeds from sales of available-for-sale securities	4,209	11,056
Proceeds from maturities of available-for-sale securities	33,047	33,705
Purchases of available-for-sale securities	(42,152)	(58,901)
Proceeds from maturities of held-to-maturity securities	2,561	2,779
Purchases of held-to-maturity securities	(7)	(455)
Net increase in loans	(4,042)	(52)
Business acquisitions, net of cash acquired	0	(77)
Purchases of equity investments and other long-term assets	(69)	(69)
Purchases of premises and equipment	(254)	(209)
Other, net	105	280
Net cash (used in) provided by investing activities	19,482	(29,323)
Financing Activities:
Net increase in time deposits	2,143	566
Net increase (decrease) in all other deposits	(13,141)	36,087
Net decrease in short-term borrowings	(1,211)	(722)
Proceeds from issuance of long-term debt, net of issuance costs	0	1,986
Payments for long-term debt and obligations under capital leases	(1,768)	(2,474)
Proceeds from issuance of preferred stock	488	500
Proceeds from exercises of common stock options	39	40
Purchases of common stock	(960)	(450)
Repurchases of common stock for employee tax withholding	(88)	(60)
Payments for cash dividends	(341)	(199)
Net cash (used in) provided by financing activities	(14,839)	35,274
Net decrease	4,239	6,176
Cash and due from banks at beginning of year	2,193	3,311
Cash and due from banks at end of year	$ 6,432	$ 9,487