Receivables - Nonaccrual Receivables (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Nonaccrual receivables:
Criteria for nonaccrual status (Minimum days contractually delinquent)	90 days
Total nonaccrual receivables	$ 1,533	[1]	$ 3,191	[1]
Nonaccrual loans carried at lower of amortized cost of fair value less cost to sell but less than 90 days delinquent	627		953
Real Estate Secured [Member]
Nonaccrual receivables:
Nonaccrual real estate secured receivables carried at lower amortized cost or fair value	417		639
Real estate secured [Member]
Nonaccrual receivables:
Total nonaccrual receivables	1,024	[2]	1,769	[2]
Nonaccrual receivables held for sale [Member]
Nonaccrual receivables:
Total nonaccrual receivables	$ 509	[3]	$ 1,422	[3]

[1] Nonaccrual receivables do not include receivables totaling $627 million and $953 million at December 31, 2014 and December 31, 2013, 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.

[2] At December 31, 2014 and December 31, 2013, nonaccrual real estate secured receivables held for investment include $417 million and $639 million, respectively, of receivables that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.

[3] For a discussion of the movements between the components of nonaccrual receivables, see Note 7, "Receivables Held for Sale," which includes discussion of 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.