Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 745	$ 773	$ 743	$ 780
Interest income recognized	19	17	38	34
U S Consumer Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	551	582	555	578
Interest income recognized	12	11	24	22
U S Consumer Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	13	10	12	14
Interest income recognized	0	0	0	0
International Consumer and Network Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	54	55	53	58
Interest income recognized	4	3	8	7
Global Commercial Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	102	109	103	106
Interest income recognized	3	3	6	5
Global Commercial Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	25	17	20	24
Interest income recognized	$ 0	$ 0	$ 0	$ 0