Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income/(loss) including income attributable to noncontrolling interest	$ 358	$ 260
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation, amortization, and accretion	184	192
Origination of mortgage servicing rights	(110)	(83)
Provisions for credit losses and foreclosed property	228	362
Mortgage repurchase provision	14	175
Stock option compensation and amortization of restricted stock compensation	8	8
Gain (Loss) on Sale of Securities, Net	2	18
Net gain on sale of assets	(198)	(252)
Net decrease/(increase) in loans held for sale	404	246
Net (increase)/decrease in other assets	(437)	(251)
Net increase/(decrease) in other liabilities	172	(537)
Net cash provided by operating activities	621	102
Cash Flows from Investing Activities:
Proceeds from maturities, calls, and paydowns of securities available for sale	1,614	1,506
Proceeds from sales of securities available for sale	33	670
Purchases of securities available for sale	(3,678)	(992)
Net (increase)/decrease in loans including purchases of loans	(167)	(1,296)
Proceeds from sales of loans	494	252
Capital expenditures	(28)	(48)
Proceeds from the sale of other assets	145	121
Net cash (used in)/provided by investing activities	(1,587)	213
Cash Flows from Financing Activities:
Net (decrease)/increase in total deposits	(2,401)	2,110
Net increase/(decrease) in funds purchased, securities sold under agreements to repurchase, and other short-term borrowings	1,134	(1,899)
Proceeds from the issuance of long-term debt	12	1,000
Repayment of long-term debt	(44)	(34)
Common and preferred dividends paid	(36)	(30)
Stock option activity	6	10
Net cash provided by/(used in) financing activities	(1,329)	1,157
Net (decrease)/increase in cash and cash equivalents	(2,295)	1,472
Cash and cash equivalents at beginning of period	8,257	4,509
Cash and cash equivalents at end of period	5,962	5,981
Supplemental Disclosures:
Loans transferred from loans held for sale to loans	12	11
Loans transferred from loans to loans held for sale	57	429
Transfer to Other Real Estate	$ 66	$ 96