Accounts Receivable and Loans (Details 2) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
U S Card Services [Member] | Card Member Loans [Member]
Financing receivable recorded investment aging
Current	$ 61,530	$ 61,995
30 to 59 days past due	191	179
60 to 89 days past due	131	128
90+ days past due	281	290
Total aging	62,133	62,592
U S Card Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	21,612	22,096
30 to 59 days past due	133	129
60 to 89 days past due	73	72
90+ days past due	147	171
Total aging	21,965	22,468
International Card Services [Member] | Card Member Loans [Member]
Financing receivable recorded investment aging
Current	6,604	7,621
30 to 59 days past due	35	39
60 to 89 days past due	22	27
90+ days past due	49	57
Total aging	6,710	7,744
International Card Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	6,412	7,557
30 to 59 days past due	29	29
60 to 89 days past due	22	20
90+ days past due	48	47
Total aging	6,511	7,653
Global Commercial Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
90+ days past due	112	120
Total aging	$ 15,748	$ 14,583