Receivables - Nonperforming Consumer Receivable Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Real estate secured	$ 26,584	[1],[2]	$ 32,939	[1],[2]
Receivables held for sale	2,047	[3]	6,203	[3]	0
Total	28,631		39,142
Performing Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	24,815	[1],[2]	29,907	[1],[2]
Receivables held for sale	625		4,042
Total	25,440		33,949
Nonperforming Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	1,769	[1],[2],[4]	3,032	[1],[2],[4]
Receivables held for sale	1,422	[4]	2,161	[4]
Total	3,191	[4]	5,193	[4]
Nonperforming receivables held for investment (TDR)	1,245		2,096
Nonperforming Loans [Member] | Real Estate Secured [Member]
Financing Receivable, Impaired [Line Items]
Nonperforming receivables held for investment	$ 639		$ 1,748

[1] At December 31, 2013 and December 31, 2012, nonaccrual real estate secured receivables held for investment include $1,245 million and $2,096 million, respectively, of TDR Loans, some of which may also be carried at fair value of the collateral less cost to sell

[2] At December 31, 2013 and December 31, 2012, nonaccrual real estate secured receivables held for investment include $639 million and $1,748 million, 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 $329 million and $1,452 million at December 31, 2013 and December 31, 2012, respectively. The following table provides a rollforward of our valuation allowance for 2013 and 2012:

[4] Nonaccrual loans do not include receivables totaling $953 million and $1,497 million at December 31, 2013 and December 31, 2012, respectively, which have been written down to the lower of amortized cost or fair value of the collateral less cost to sell which are less than 90 days contractually delinquent and not accruing interest.