Receivables, net - Nonperforming Consumer Receivable Portfolio (Detail) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3]	$ 8,573	$ 9,156
Receivables held for sale	[3]	8,185	8,265
Total	[3]	16,758	17,421
Nonaccrual loans carried at lower of amortized cost of fair value less cost to sell but less than 90 days delinquent		541	501
Accruing Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3]	8,351	8,873
Receivables held for sale	[3]	7,741	7,879
Total	[3]	16,092	16,752
Nonaccrual Loans [Member]
Financing Receivable, Impaired [Line Items]
Real estate secured	[1],[2],[3],[4]	222	283
Receivables held for sale	[3],[4]	444	386
Total	[3],[4]	666	669
Nonperforming receivables held for investment (TDR)		139	178
Nonaccrual Loans [Member] | Real Estate Secured [Member]
Financing Receivable, Impaired [Line Items]
Nonperforming receivables held for investment		$ 149	$ 187

[1] At March 31, 2016 and December 31, 2015, nonperforming real estate secured receivables held for investment include $139 million and $178 million, respectively, of TDR Loans, some of which may also be carried at fair value of the collateral less cost to sell

[2] At March 31, 2016 and December 31, 2015, nonperforming real estate secured receivables held for investment include $149 million and $187 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 balances included in this table reflect the principal amount outstanding on the loan net of any charge-off recorded in accordance with our existing charge-off policies but exclude any basis adjustments to the loan such as unearned income, unamortized deferred fees and costs on originated loans, purchase accounting fair value adjustments and premiums or discounts on purchased receivables. Additionally, the balances in this table related to receivables which have been classified as held for sale have been reduced by the lower of amortized cost or fair value adjustment recorded as well as the credit loss reserves associated with these receivables prior to the transfer.

[4] Nonperforming receivables do not include receivables totaling $541 million and $501 million at March 31, 2016 and December 31, 2015, respectively, which are less than 90 days contractually delinquent and not accruing interest.