Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities:
Net income (loss)	$ 1,920	$ 1,556	$ (1,881)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	218	1,244	(1,961)
Amortization of other intangible assets	200	179	136
Other non-cash adjustments for depreciation, amortization and accretion	180	(409)	(457)
Extraordinary loss			6,096
(Gains) Losses related to investment securities, net	(67)	286	(141)
Change in trading account assets, net	(183)	(331)	366
Change in accrued income receivable	(89)	(236)	241
Change in collateral deposits	817	(1,900)	1,358
Change in trading liabilities, net	(441)	555
Other, net	819	(121)	(7,988)
Net cash (used in) provided by operating activities	3,374	823	(4,231)
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	(36,652)	4,398	29,222
Net increase in securities purchased under resale agreements	(4,117)	(541)	(752)
Proceeds from sales of available-for-sale securities	16,272	24,736	8,274
Proceeds from maturities of available-for-sale securities	44,810	34,250	43,995
Purchases of available-for-sale securities	(78,748)	(65,485)	(58,780)
Net decrease in securities related to AMLF			6,111
Proceeds from sales of held-to-maturity securities		4,676
Proceeds from maturities of held-to-maturity securities	3,653	5,249	4,498
Purchases of held-to-maturity securities	(457)	(426)	(1,600)
Net (increase) decrease in loans	1,638	(1,320)	800
Business acquisitions, net of cash acquired	(214)	(2,332)
Purchases of equity investments and other long-term assets	(69)	(114)	(241)
Purchases of premises and equipment	(298)	(262)	(325)
Other, net	287	363	430
Net cash (used in) provided by investing activities	(53,895)	3,192	31,632
Financing Activities:
Net increase (decrease) in time deposits	(124)	857	1,267
Net increase (decrease) in all other deposits	59,066	7,426	(23,408)
Net decrease in short term borrowings related to AMLF			(6,042)
Net decrease in short-term borrowings	(8,555)	(11,233)	(4,163)
Proceeds from issuance of long-term debt, net of issuance costs	1,986		4,435
Payments for long-term debt and obligations under capital leases	(2,486)	(341)	(29)
Proceeds from issuance of preferred stock	500
Redemption of TARP preferred stock			(2,000)
Proceeds from public offering of common stock, net of issuance costs			2,231
Repurchase of TARP common stock warrant			(60)
Purchases of common stock	(675)
Proceeds from exercises of common stock options	40	10	34
Repurchases of common stock for employee tax withholding	(63)	(44)	(38)
Proceeds from issuances of treasury stock for common stock awards and option exercises	9
Payments for cash dividends	(295)	(20)	(168)
Net cash (used in) provided by financing activities	49,403	(3,345)	(27,941)
Net increase (decrease)	(1,118)	670	(540)
Cash and due from banks at beginning of year	3,311	2,641	3,181
Cash and due from banks at end of year	2,193	3,311	2,641
Supplemental disclosure:
Interest paid	611	763	722
Income taxes paid (refunded), net	305	(11)	884
Non-cash acquisitions of investment securities			14,111
Non-cash acquisitions of loans			2,510
Non-cash investments in premises and equipment and capital leases			126
Non-cash additions of short-term borrowings			$ 20,919