Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows From Operating Activities:
Net income	$ 1,332	$ 854	$ 877
Adjustments to reconcile net income to net cash from operating activities:
Provision for credit losses	1,190	2,638	2,811
Depreciation	264	260	225
Amortization of intangibles	99	122	114
Equity-based compensation	98	79	62
(Gain) loss on sales of securities, net	(62)	(554)	(199)
Net write-downs/losses on foreclosed property	655	576	253
Net change in operating assets and liabilities:
Segregated cash due from banks	289	(39)	109
Trading securities	38	3	(260)
Loans held for sale	(583)	(620)	(31)
FDIC loss share receivable	869	921	0
Other assets	(55)	(2,006)	(1,058)
Accounts payable and other liabilities	572	689	(3,390)
Other, net	(141)	(25)	(6)
Net cash from operating activities	4,565	2,898	(493)
Cash Flows From Investing Activities:
Proceeds from sales of securities available for sale	4,006	31,334	17,074
Proceeds from maturities, calls and paydowns of securities available for sale	3,271	6,049	7,918
Purchases of securities available for sale	(13,926)	(26,598)	(21,924)
Proceeds from maturities, calls and paydowns of securities held to maturity	1,828	0	0
Purchases of securities held to maturity	(7,578)	0	0
Originations and purchases of loans and leases, net of principal collected	(6,240)	(4,594)	(392)
Net cash from divestitures	0	(832)	27
Net cash from business combinations	(86)	(7)	4,475
Purchases of premises and equipment	(224)	(428)	(174)
Proceeds from sales of foreclosed property or other real estate held for sale	1,017	967	404
Other, net	106	88	(175)
Net cash from investing activities	(17,826)	5,979	7,233
Cash Flows From Financing Activities:
Net change in deposits	17,799	(6,843)	(2,901)
Net change in federal funds purchased, securities sold under repurchase agreements and short-term borrowed funds	(2,107)	(2,434)	(2,756)
Proceeds from issuance of long-term debt	2,010	500	3,758
Repayment of long-term debt	(2,190)	(336)	(3,749)
Net proceeds from common stock issued	22	110	2,727
Retirement of preferred stock and warrant			(3,201)
Cash dividends paid on common stock	(446)	(415)	(727)
Cash dividends paid on preferred stock			(93)
Other, net	132	277	111
Net cash from financing activities	15,220	(9,141)	(6,831)
Net Change in Cash and Cash Equivalents	1,959	(264)	(91)
Cash and Cash Equivalents at Beginning of Period	2,385	2,649	2,740
Cash and Cash Equivalents at End of Period	4,344	2,385	2,649
Supplemental Disclosure of Cash Flow Information:
Cash paid during the period for interest	1,404	1,868	2,126
Cash paid (received) during the period for income taxes	(82)	972	431
Noncash investing and financing activities:
Transfer of securities available for sale to securities held to maturity	8,341	0	0
Transfers of loans to foreclosed property	1,083	1,521	1,551
Transfers of loans held for investment to loans held for sale	226	1,604	731
Common stock issued in business combinations	$ 1	$ 2	$ 40