Receivables - Nonperforming Consumer Receivable Portfolio (Detail) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3]	$ 10,307	$ 22,670
Receivables held for sale	[3]	10,310	860
Total	[3]	20,617	23,530
Nonaccrual loans carried at lower of amortized cost of fair value less cost to sell but less than 90 days delinquent		499	627
Accruing Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3]	9,987	21,646
Receivables held for sale	[3]	9,504	351
Total	[3]	19,491	21,997
Nonaccrual Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3],[4]	320	1,024
Receivables held for sale	[3],[4]	806	509
Total	[3],[4]	1,126	1,533
Nonperforming receivables held for investment (TDR)		197	739
Nonaccrual Loans [Member] | Real Estate Secured [Member]
Financing Receivable, Impaired [Line Items]
Nonperforming receivables held for investment		$ 208	$ 417

[1] At June 30, 2015 and December 31, 2014, nonaccrual real estate secured receivables held for investment include $197 million and $739 million, 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, 2015 and December 31, 2014, nonaccrual real estate secured receivables held for investment include $208 million and $417 million, respectively, of receivables that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.

[3] The receivable balances included in this table reflect the current carrying amount of the loan excluding certain basis adjustments to the loan such as deferred fees and costs on originated loans, purchase accounting fair value adjustments and premiums or discounts on purchased receivables.

[4] Nonaccrual loans do not include receivables totaling $499 million and $627 million at June 30, 2015 and December 31, 2014, 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.