Receivables - Summary of Contractual Delinquency and Delinquency Ratio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Mortgage Loans in Process of Foreclosure , Amount	$ 762		$ 745
First Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	1,063	[1]	1,388	[1]
Delinquency Ratio	5.51%	[1]	6.89%	[1]
Second Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	131	[1]	154	[1]
Delinquency Ratio	5.41%	[1]	6.12%	[1]
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	1,867	[1],[2]	2,072	[1],[2]
Delinquency Ratio	8.18%	[1]	8.81%	[1]
Receivables Held For Sale [Member] | Real Estate Secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	$ 673	[1]	$ 530	[1]
Delinquency Ratio	61.35%	[1]	61.63%	[1]

[1] The receivable balances included in this table reflects the principal amount outstanding on the loan net of any charge-off recorded in accordance with our existing charge-off policies but excludes 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, 2015 and December 31, 2014, total real estate secured receivables includes $762 million and $745 million, respectively, that are in the process of foreclosure.