Accounts Receivable and Loans (Details 2) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
U S Card Services [Member] | Card Member Loans [Member]
Financing receivable recorded investment aging
Current	$ 61,184	$ 61,995
30 to 59 days past due	163	179
60 to 89 days past due	119	128
90+ days past due	265	290
Total aging	61,731	62,592
U S Card Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	21,758	22,096
30 to 59 days past due	114	129
60 to 89 days past due	65	72
90+ days past due	150	171
Total aging	22,087	22,468
International Card Services [Member] | Card Member Loans [Member]
Financing receivable recorded investment aging
Current	7,053	7,621
30 to 59 days past due	36	39
60 to 89 days past due	25	27
90+ days past due	56	57
Total aging	7,170	7,744
International Card Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	6,707	7,557
30 to 59 days past due	29	29
60 to 89 days past due	19	20
90+ days past due	49	47
Total aging	6,804	7,653
Global Commercial Services [Member] | Card Member Receivables [Member]
Financing receivable recorded investment aging
90+ days past due	108	120
Total aging	$ 15,853	$ 14,583