Receivables - Summary of Contractual Delinquency and Delinquency Ratio (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	$ 6,315		$ 6,273
Delinquency Ratio	18.52%		16.03%
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	6,315		6,170
Delinquency Ratio	18.52%		17.16%
First Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	6,041	[1]	5,821	[1]
Delinquency Ratio	19.62%	[1]	18.01%	[1]
First Lien [Member] | Held For Sale [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	3,800		2,200
Second Lien [Member]
Financing Receivable, Modifications [Line Items]
Dollars of Delinquency	274		349
Delinquency Ratio	8.25%		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 $3.8 billion and $2.2 billion of real estate secured receivables classified as held for sale at June 30, 2013 and December 31, 2012, respectively.