Receivables, net - Summary of Contractual Delinquency and Delinquency Ratio (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Mortgage Loans in Process of Foreclosure , Amount		$ 363	$ 745
Receivables Held For Sale [Member] | Real Estate Secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 569	$ 530
Delinquency Ratio	[1]	6.88%	61.63%
First lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 272	$ 1,388
Delinquency Ratio	[1]	3.73%	6.89%
Second lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1]	$ 94	$ 154
Delinquency Ratio	[1]	5.07%	6.12%
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	[1],[2]	$ 935	$ 2,072
Delinquency Ratio	[1],[2]	5.37%	8.81%

[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 December 31, 2015 and December 31, 2014, total real estate secured receivables include $363 million and $745 million, respectively, that are in the process of foreclosure.