Accounts Receivable and Loans (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 782	$ 987	$ 844	$ 1,139
Interest income recognized	16	15	49	46
U S Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	675	859	734	982
Interest income recognized	12	11	37	34
U S Card Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	44	62	47	89
Interest income recognized	0	0	0	0
International Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	63	66	63	68
Interest income recognized	$ 4	$ 4	$ 12	$ 12