Receivables Held for Sale - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				0 Months Ended	3 Months Ended				0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended			6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Jun. 01, 2013 First Mortgage [Member]	Jun. 30, 2013 First Mortgage [Member]	Mar. 31, 2013 First Mortgage [Member]	Dec. 31, 2012 First Mortgage [Member]	Jun. 30, 2012 First Mortgage [Member]	Aug. 01, 2013 First Mortgage [Member] Subsequent Event [Member]	Jun. 30, 2013 First Mortgage [Member] Loans Receivable [Member]	Apr. 02, 2013 Personal non-credit card [Member]	Jun. 30, 2013 Personal non-credit card [Member]		Mar. 31, 2013 Personal non-credit card [Member]	Jun. 30, 2013 Personal non-credit card [Member]		Dec. 31, 2012 Personal non-credit card [Member]		Jun. 30, 2013 Real Estate Secured [Member]	Jun. 30, 2013 Real Estate Secured [Member]	Jun. 30, 2013 Real Estate Owned [Member]		Jun. 30, 2013 Real Estate Owned [Member]		Mar. 31, 2013 Real Estate Owned [Member]	Dec. 31, 2012 Real Estate Owned [Member]	Jun. 30, 2013 Real Estate Owned [Member]	Jun. 30, 2013 Real Estate Owned [Member]	Jun. 30, 2013 Short Sales [Member]	Jun. 30, 2013 Short Sales [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid principal balance							$ 439,000,000	$ 2,600,000,000			$ 8,100,000,000	$ 685,000,000
Net realizable value of assets									1,800,000,000		4,600,000,000
Mortgage loans held for sale							230,000,000					396,000,000
Proceeds from sale of loans held-for-sale							229,000,000					405,000,000						3,000,000,000
Gain (loss) on sales of loans								(9,000,000)							(11,000,000)
Fair value adjustment on transfter to held-for-sale													100,000,000
Period of receivables sold in multiple transactions			18 months
Servicing Fees															12,000,000
Receivables held for sale	4,991,000,000	[1]	4,991,000,000	[1]	6,354,000,000	6,203,000,000		4,991,000,000		3,022,000,000					0	[1]	2,947,000,000	0	[1]	3,181,000,000	[2]			4,991,000,000	[1]	4,991,000,000	[1]	3,407,000,000	3,022,000,000
Real estate secured receivables held for sale through short sale or transfer to REO	(171,000,000)		(318,000,000)												0			0						(171,000,000)		(318,000,000)				118,000,000	230,000,000	53,000,000	88,000,000
Lower of amortized cost or fair value adjustment	(471,000,000)		(925,000,000)												0		(82,000,000)	82,000,000				(453,000,000)	(947,000,000)	(471,000,000)		(1,007,000,000)				(16,000,000)	(49,000,000)	(2,000,000)	(11,000,000)
Charges														$ 82,000,000

[1] Net of a valuation allowance of $309 million at June 30, 2013.

[2] The majority of the real estate secured receivables held for sale consider collateral value, among other items, in determining fair value. Collateral values are based on the most recently available broker's price opinion and the collateral loss severity rate averaged 31 percent and 37 percent at June 30, 2013 and December 31, 2012, respectively.