Fair Value (Nonrecurring Fair Value Measurements) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010		Dec. 31, 2010
Nonaccrual Loans [Member]
Fair Value	$ 339	[1]			$ 339	[1]			$ 429	[1]
Gains (Losses)	(42)	[1]	26	[1]	(81)	[1]
Loans Held for Sale [Member]
Fair Value	267	[1]			267	[1]			350	[1]
Gains (Losses)	(18)	[1]	(78)	[1]	(18)	[1]	(78)	[1]
Commercial Mortgage Servicing Rights [Member]
Fair Value	575	[1]			575	[1]			644	[1]
Gains (Losses)	(40)	[1]	(14)	[1]	(75)	[1]	(18)	[1]
Other Intangible Assets [Member]
Fair Value	0	[1]			0	[1]			1	[1]
Gains (Losses)	0	[1]			0	[1]
Foreclosed and Other Assets [Member]
Fair Value	175	[1]			175	[1]			245	[1]
Gains (Losses)	(22)	[1]	(35)	[1]	(42)	[1]	(58)	[1]
Long-Lived Assets Held for Sale [Member]
Fair Value	5	[1]			5	[1]			25	[1]
Gains (Losses)	(1)	[1]	(4)	[1]	(2)	[1]	(13)	[1]
Equity Investments [Member]
Fair Value	0	[1],[2]			0	[1],[2]			3	[1],[2]
Gains (Losses)	0	[1],[2]			0	[1],[2]
Total Assets [Member]
Fair Value	1,361	[1]			1,361	[1]			1,697	[1]
Gains (Losses)	$ (123)	[1]	$ (105)	[1]	$ (218)	[1]	$ (167)	[1]

[1] All Level 3.

[2] Includes LIHTC and other equity investments.