Receivables Held for Sale - Additional Information (Detail) (USD $)	3 Months Ended					3 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 First Mortgage [Member]	Dec. 31, 2012 First Mortgage [Member]	Jun. 30, 2012 First Mortgage [Member]	Mar. 31, 2013 Personal non-credit card [Member]	Dec. 31, 2012 Personal non-credit card [Member]	Mar. 31, 2013 Real Estate Owned [Member]	Mar. 31, 2013 Short Sales [Member]	Mar. 31, 2013 Real Estate Owned [Member]	Mar. 31, 2013 Additions [Member] First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid principal balance			$ 490,000,000		$ 8,100,000,000
Net realizable value of assets					4,600,000,000
Period of receivables sold in multiple transactions	2 years
Real estate secured receivables held for sale through short sale or transfer to REO	(147,000,000)					0		(147,000,000)	(35,000,000)	112,000,000
Receivables held for sale	6,354,000,000	6,203,000,000	3,407,000,000	3,022,000,000		2,947,000,000	3,181,000,000	3,407,000,000
Proceeds from Sale of Loans Held-for-sale						2,900,000,000
Lower of amortized cost or fair value adjustment	$ (454,000,000)					$ 82,000,000		$ (536,000,000)	$ (9,000,000)	$ (33,000,000)	$ (536,000,000)