Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 491	$ 638
Adjustments to reconcile net income to net cash provided by operating activities:
(Reversal of) provision for loan losses	30	(209)
(Reversal of) provision for losses on off-balance sheet commitments	(7)	(31)
Depreciation, amortization and accretion, net	351	157
Stock-based compensation-restricted stock units		5
Deferred income taxes	3	185
Net gains on sales of securities	(88)	(58)
Net decrease (increase) in trading account assets	(101)	(121)
Net decrease (increase) in other assets	170	13
Net increase (decrease) in trading account liabilities	(88)	171
Net increase (decrease) in other liabilities	(591)	820
Loans originated for resale	(8)	(17)
Net proceeds from sale of loans originated for resale	6	19
Other, net	(85)	(74)
Total adjustments	(408)	860
Net cash provided by operating activities	83	1,498
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	6,109	4,463
Proceeds from matured and called securities available for sale	5,185	3,941
Purchases of securities available for sale and held to maturity	(7,751)	(7,083)
Proceeds from matured securities held to maturity	155	74
Purchases of premises and equipment, net	(50)	(44)
Proceeds from sales of loans	227	186
Net decrease (increase) in loans	(3,256)	(3,376)
Proceeds from FDIC loss share agreements	64	134
Other, net	12	(3)
Net cash provided by (used in) investing activities	695	(1,708)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	713	500
Net increase (decrease) in commercial paper and other short-term borrowings	(1,592)	1,099
Proceeds from issuance of long-term debt	895	2,000
Repayment of long-term debt	(2,025)	(513)
Other, net	2	(2)
Change in noncontrolling interests	6	14
Net cash provided by (used in) financing activities	(2,001)	3,098
Net change in cash and cash equivalents	(1,223)	2,888
Cash and cash equivalents at beginning of period	4,195	1,174
Cash and cash equivalents at end of period	2,972	4,062
Cash Paid During the Period For:
Interest	276	246
Income taxes, net	184	117
Supplemental Schedule of Noncash Investing and Financing Activities:
Carrying amount of securities held to maturity immediately prior to transfer to securities available for sale	1,112
Securities available for sale transferred to securities held to maturity	155
Net transfer of loans held for investment to loans held for sale	200	198
Transfer of loans held for investment to other real estate owned assets (OREO)	$ 83	$ 126