Accounts Receivable and Loans (Details 5) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 774	$ 782	$ 775	$ 844
Interest income recognized	19	16	53	49
U S Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	693	675	685	734
Interest income recognized	16	12	43	37
U S Card Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	28	44	35	47
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	53	63	55	63
Interest income recognized	$ 3	$ 4	$ 10	$ 12