Financial Derivatives (Derivatives Not Designated as Hedging Instruments under GAAP) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Total gains (losses) from derivatives not designated as hedging instruments	$ 166		$ 358		$ 185		$ 418
Commercial Mortgage Banking Interest Rate Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(8)		(50)		(5)		(71)
Commercial Mortgage Banking Credit Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	2		(2)		4		(9)
Residential Mortgage Banking Servicing Interest Rate Contract [Member]
Total gains (losses) from derivatives not designated as hedging instruments	154		351		165		421
Residential Mortgage Banking Loan Sales Interest Rate Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(18)		(56)		(3)		(77)
Customer Related Activities Interest Rate Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	12		(21)		40		(27)
Customer Related Activities Foreign Exchange Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	8		(7)		22		6
Customer Related Activities Equity Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(1)		2		(3)		1
Customer Related Activities Credit Participation Risk Agreements [Member]
Total gains (losses) from derivatives not designated as hedging instruments	2		(1)		2		(2)
Other Risk Management Activities Interest Rate Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(3)		(15)		(2)		(14)
Other Risk Management Activities Foreign Exchange Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(2)		3		(3)		2
Other Risk Management Activities Credit Contracts Default Swaps [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(1)				(2)		4
Other Risk Management Activities Other Contracts [Member]
Total gains (losses) from derivatives not designated as hedging instruments	21	[1]	154	[1]	(30)	[1]	184	[1]
Derivatives Used for Residential Mortgage Banking Activities [Member]
Total gains (losses) from derivatives not designated as hedging instruments	136	[2]	295	[2]	162	[2]	344	[2]
Derivatives Used for Commercial Mortgage Banking Activities [Member]
Total gains (losses) from derivatives not designated as hedging instruments	(6)	[3]	(52)	[3]	(1)	[3]	(80)	[3]
Derivatives Used for Customer-Related Activities [Member]
Total gains (losses) from derivatives not designated as hedging instruments	21	[3]	(27)	[3]	61	[3]	(22)	[3]
Derivatives used for other risk management activities [Member]
Total gains (losses) from derivatives not designated as hedging instruments	$ 15	[3]	$ 142	[3]	$ (37)	[3]	$ 176	[3]

[1] Relates to BlackRock LTIP.

[2] Included in residential mortgage noninterest income

[3] Included in other noninterest income.