Variable Interest Entities - Loans Sold to Third-Party Sponsored Securitization Entities (Details 5) (Variable Interest Entity, Not Primary Beneficiary [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Variable Interest Entity, Not Primary Beneficiary [Member]
Summary of loan sale activities [Abstract]
Carrying value of loans sold	$ 39,130,000,000	$ 42,543,000,000	$ 110,986,000,000	$ 108,090,000,000
Proceeds received from loan sales as cash	1,298,000,000	2,786,000,000	2,203,000,000	3,386,000,000
Proceeds received from loan sales as securities	37,252,000,000	39,045,000,000	106,935,000,000	102,861,000,000
Total proceeds received from loan sales	38,550,000,000	41,831,000,000	109,138,000,000	106,247,000,000
Gains on loan sales	43,000,000	91,000,000	95,000,000	182,000,000
Loans Repurchased Or Loans With The Option To Repurchase	13,700,000,000		13,700,000,000		13,000,000,000
Real Estate Acquired Through Foreclosure	$ 2,400,000,000		$ 2,400,000,000		$ 1,900,000,000