Receivables, net - Summary of Contractual Delinquency and Delinquency Ratio (Detail) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Mortgage Loans in Process of Foreclosure , Amount		$ 382	$ 363
Receivables Held For Sale [Member] | Real Estate Secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 596	$ 569
Delinquency Ratio	[1]	7.28%	6.88%
First lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 209	$ 272
Delinquency Ratio	[1]	3.07%	3.73%
Second lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 72	$ 94
Delinquency Ratio	[1]	4.08%	5.07%
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1],[2]	$ 877	$ 935
Delinquency Ratio	[1],[2]	5.23%	5.37%

[1] The receivable 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 loans. 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.

[2] At March 31, 2016 and December 31, 2015, total real estate secured receivables include $382 million and $363 million, respectively, that are in the process of foreclosure.