Receivables - Nonaccrual Receivables (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Nonaccrual receivables:
Total nonaccrual receivables	$ 5,090		$ 5,193
Criteria for nonaccrual status (Minimum days contractually deliquent)	90 days
Real Estate Secured [Member]
Nonaccrual receivables:
Nonaccrual real estate secured receivables carried at lower amortized cost or fair value	637		1,748
Real estate secured [Member]
Nonaccrual receivables:
Total nonaccrual receivables	1,803	[1]	3,032	[1]
Nonaccrual receivables held for sale [Member]
Nonaccrual receivables:
Total nonaccrual receivables	$ 3,287	[1]	$ 2,161	[1]

[1] At September 30, 2013 and December 31, 2012, nonaccrual real estate secured receivables held for investment include $637 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. For a discussion of the movements between the components of nonaccrual receivables, see Note 6, "Receivables Held for Sale," which includes discussion of the transfer of real estate secured receivables that were carried at the lower of amortized cost or fair value of the collateral less cost to sell to held for sale during the second and third quarters of 2013 as well as discussion regarding the formal program introduced in the second quarter of 2013 to transfer receivables (meeting pre-determined criteria) to held for sale when the receivable is written down to the lower of amortized cost or fair value of the collateral less cost to sell in accordance with our existing charge-off policies.