Fair Value (Fair Value Option - Changes in Fair Value) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Customer Resale Agreements [Member]
Gains (Losses) - FVO: Changes in Fair Value	$ (2,000,000)		$ (3,000,000)	$ (5,000,000)
Trading Loans [Member]
Gains (Losses) - FVO: Changes in Fair Value			1,000,000	2,000,000
Loans Held For Sale [Member] | Commercial Mortgage [Member]
Gains (Losses) - FVO: Changes in Fair Value	6,000,000	1,000,000	13,000,000	(11,000,000)
Loans Held For Sale [Member] | Residential Mortgage [Member]
Gains (Losses) - FVO: Changes in Fair Value	26,000,000	72,000,000	155,000,000	64,000,000
Quantifying Misstatement In Current Year Financial Statements Amount				29,000,000
Loans - Portfolio [Member] | Residential Mortgage [Member]
Gains (Losses) - FVO: Changes in Fair Value	26,000,000	13,000,000	113,000,000	45,000,000
Quantifying Misstatement In Current Year Financial Statements Amount				(22,000,000)
BlackRock Series C Preferred Stock
Gains (Losses) - FVO: Changes in Fair Value	10,000,000	14,000,000	13,000,000	74,000,000
Other Borrowed Funds [Member]
Gains (Losses) - FVO: Changes in Fair Value	$ (3,000,000)	$ (2,000,000)		$ (5,000,000)