Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities:
Net income (loss)	$ 427	$ 471
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	78	10
Amortization of other intangible assets	51	49
Other non-cash adjustments for depreciation, amortization and accretion	91	10
(Gains) Losses related to investment securities, net	(11)	7
Change in trading account assets, net	(66)	(1,353)
Change in accrued income receivable	(144)	(117)
Change in collateral deposits, net	(195)	(481)
Change in unrealized (gains) losses on foreign exchange derivatives, net	461	(605)
Change in other assets, net	929	147
Change in trading liabilities, net	34	1,440
Change in accrued expenses and other liabilities, net	156	1,197
Other, net	(496)	(622)
Net cash (used in) provided by operating activities	1,315	153
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	32,177	2,250
Net (increase) decrease in securities purchased under resale agreements	(850)	675
Proceeds from sales of available-for-sale securities	1,087	3,935
Proceeds from maturities of available-for-sale securities	10,790	7,329
Purchases of available-for-sale securities	(15,344)	(19,008)
Proceeds from maturities of held-to-maturity securities	765	629
Purchases of held-to-maturity securities	(2)	(452)
Net (increase) decrease in loans	(2,230)	(775)
Business acquisitions, net of cash acquired	0	(77)
Purchases of equity investments and other long-term assets	(11)	(25)
Purchases of premises and equipment	(85)	(89)
Other, net	26	14
Net cash (used in) provided by investing activities	26,323	(5,594)
Financing Activities:
Net increase (decrease) in time deposits	(5,720)	(4,661)
Net increase (decrease) in all other deposits	(21,387)	13,730
Net decrease in short-term borrowings	(1,177)	(5,744)
Proceeds from issuance of long-term debt, net of issuance costs	0	1,986
Payments for long-term debt and obligations under capital leases	(6)	(1,012)
Proceeds from issuance of preferred stock	0	500
Proceeds from exercises of common stock options	6	30
Repurchases of common stock for employee tax withholding	(69)	(57)
Payments for cash dividends	(95)	(5)
Net cash (used in) provided by financing activities	(28,448)	4,767
Net increase (decrease)	(810)	(674)
Cash and due from banks at beginning of year	2,193	3,311
Cash and due from banks at end of year	$ 1,383	$ 2,637