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	$ 1,479	$ 932
Adjustments to reconcile net income to net cash from operating activities:
Provision for credit losses	805	918
Depreciation	207	196
Amortization of intangibles	82	75
Equity-based compensation	79	73
(Gain) loss on securities, net	12	41
Net write-downs/losses on foreclosed property	152	337
Net change in operating assets and liabilities:
Segregated cash due from banks	17	290
Loans held for sale	(143)	426
FDIC loss share receivable	436	629
Other assets	(653)	126
Accounts payable and other liabilities	438	263
Other, net	(241)	42
Net cash from operating activities	2,670	4,348
Cash Flows From Investing Activities:
Proceeds from sales of securities available for sale	249	401
Proceeds from maturities, calls and paydowns of securities available for sale	2,959	2,395
Purchases of securities available for sale	(4,453)	(11,605)
Proceeds from maturities, calls and paydowns of securities held to maturity	3,566	730
Purchases of securities held to maturity	(1,169)	(523)
Originations and purchases of loans and leases, net of principal collected	(5,773)	(2,865)
Net cash paid for acquisitions	692	0
Purchases of premises and equipment	(117)	(176)
Proceeds from sales of foreclosed property or other real estate held for sale	677	735
Other, net	95	70
Net cash from investing activities	(3,274)	(10,838)
Cash Flows From Financing Activities:
Net change in deposits	1,618	10,427
Net change in federal funds purchased, securities sold under repurchase agreements and short-term borrowed funds	(473)	(1,720)
Proceeds from issuance of long-term debt	1,828	1,999
Repayment of long-term debt	(4,538)	(1,862)
Net cash from common stock transactions	12	22
Net cash from preferred stock transactions	1,679	0
Cash dividends paid on common stock	(391)	(334)
Cash dividends paid on preferred stock	(8)	0
Other, net	36	(23)
Net cash from financing activities	(237)	8,509
Net Change in Cash and Cash Equivalents	(841)	2,019
Cash and Cash Equivalents at Beginning of Period	4,344	2,385
Cash and Cash Equivalents at End of Period	3,503	4,404
Supplemental Disclosure of Cash Flow Information:
Cash paid (received) during the period for interest	839	1,047
Cash paid (received) during the period for income taxes	344	(209)
Noncash investing and financing activities:
Transfer of securities available for sale to securities held to maturity	1	8,341
Transfers of loans to foreclosed property	374	856
Purchases of securities held to maturity not yet settled	$ 1,450	$ 0