Receivables Held for Sale - Summary of Receivables Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Total receivables held-for-sale	$ 4,991	[1]	$ 6,354	$ 6,203
First Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total receivables held-for-sale	4,991			3,022
Personal non-credit card [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total receivables held-for-sale	$ 0	[1]	$ 2,947	$ 3,181	[2]

[1] Net of a valuation allowance of $309 million at June 30, 2013.

[2] The majority of the real estate secured receivables held for sale consider collateral value, among other items, in determining fair value. Collateral values are based on the most recently available broker's price opinion and the collateral loss severity rate averaged 31 percent and 37 percent at June 30, 2013 and December 31, 2012, respectively.