Receivables - Summary of Contractual Delinquency and Delinquency Ratio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	$ 6,167		$ 6,273
Delinquency Ratio	18.94%		16.03%
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	6,167		6,170
Delinquency Ratio	18.94%		17.16%
First Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	5,878	[1]	5,821	[1]
Delinquency Ratio	19.99%	[1]	18.01%	[1]
First Lien [Member] | Held For Sale [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	3,411		2,176
Second Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	289		349
Delinquency Ratio	9.13%		9.59%
Personal non-credit card [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	$ 0		$ 103
Delinquency Ratio	0.00%		3.24%

[1] Dollars of delinquency for first lien real estate secured receivables includes $3,411 million and $2,176 million of real estate secured receivables classified as held for sale at September 30, 2013 and December 31, 2012, respectively.