Receivables - Receivables Classified as Trouble Debt Restructuring Loan (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Receivables classified as Trouble Debt Restructuring Loans
Total	$ 318	$ 753	$ 715	$ 1,787
Real estate secured [Member]
Receivables classified as Trouble Debt Restructuring Loans
Total	318	678	694	1,585
First Lien [Member]
Receivables classified as Trouble Debt Restructuring Loans
Total	290	608	630	1,430
Second Lien [Member]
Receivables classified as Trouble Debt Restructuring Loans
Total	28	70	64	155
Personal non-credit card [Member]
Receivables classified as Trouble Debt Restructuring Loans
Total	$ 0	$ 75	$ 21	$ 202