Receivables - Nonperforming Consumer Receivable Portfolio (Detail) (USD $)	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Real estate secured	$ 29,112,000,000	[1],[2]		$ 32,939,000,000	[1],[2]
Receivables held for sale	4,991,000,000	[3]	6,354,000,000	6,203,000,000
Personal non-credit card				6,203,000,000
Total	34,103,000,000			39,142,000,000
Performing Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	27,533,000,000	[1],[2]		29,907,000,000	[1],[2]
Receivables held for sale	1,265,000,000
Personal non-credit card				4,042,000,000
Total	28,798,000,000			33,949,000,000
Nonperforming Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	1,579,000,000	[1],[2]		3,032,000,000	[1],[2]
Receivables held for sale	3,726,000,000
Personal non-credit card				2,161,000,000
Total	5,305,000,000			5,193,000,000
Nonperforming receivables held for investment (TDR)	1,200,000,000			2,100,000,000
Real Estate Secured [Member] | Nonperforming Loans [Member]
Financing Receivable, Impaired [Line Items]
Nonperforming receivables held for investment	$ 642,000,000			$ 1,700,000,000

[1] At June 30, 2013 and December 31, 2012, nonaccrual real estate secured receivables held for investment include $1.2 billion and $2.1 billion, respectively, of TDR Loans, some of which may also be carried at fair value of the collateral less cost to sell

[2] At June 30, 2013 and December 31, 2012, nonaccrual real estate secured receivables held for investment include $642 million and $1.7 billion, respectively, of receivables that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.

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