Variable Interest Entities - Loans Sold to Third-Party Sponsored Securitization Entities (Details 5) (Variable Interest Entity, Not Primary Beneficiary [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity, Not Primary Beneficiary [Member]
Summary of loan sale activities [Abstract]
Carrying value of loans sold	$ 166,028,000,000	$ 179,008,000,000	$ 149,247,000,000
Proceeds from Sale of Mortgage Loans Held-for-sale	782,000,000	195,000,000	122,000,000
Proceeds received from loan sales as securities	163,373,000,000	176,592,000,000	146,704,000,000
Total proceeds received from loan sales	164,155,000,000	176,787,000,000	146,826,000,000
Gains on loan sales	302,000,000	141,000,000	133,000,000
Loans Repurchased Or Loans With The Option To Repurchase	14,300,000,000	15,600,000,000
Real Estate Acquired Through Foreclosure	$ 2,000,000,000	$ 1,600,000,000