Receivables - Additional Information Relating to Trouble Debt Restructuring Loan (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Average balance of TDR Loans:
Total average balance of TDR Loans	$ 15,710	$ 16,801	$ 13,512
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	1,075	1,149	785
Real estate secured [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	15,566	15,876	12,351
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	1,035	975	652
First Lien [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	14,430	14,657	11,450
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	927	871	590
Second Lien [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	1,136	1,219	901
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	108	104	62
Personal non-credit card [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	144	925	1,161
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	$ 40	$ 174	$ 133