Loans and Accounts Receivable (Details 4) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 244	$ 216
Non-accrual loans	173	150
Financing Receivable, Modifications, In-Program, Recorded Investment	228	199
Financing Receivable, Modifications, Out of Program, Recorded Investment	151	113
Total impaired loans and receivables	796	678
Unpaid principal balance	738	632
Related allowance for Troubled Debt Restructurings	81	73
Accounts Receivable and Loans Textuals [Abstract]
Total loans and receivables modified as a TDR, non-accrual	16	18
Total loans and receivables modified as a TDR, past due 90 days and still accruing	19	20
Financing Receivable, Modifications, Out of Program - success, Recorded Investment	114	84
Financing Receivable, Modifications, Out of Program - not compliant, Recorded Investment	37	29
U S Consumer Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	162	140
Non-accrual loans	141	124
Financing Receivable, Modifications, In-Program, Recorded Investment	174	149
Financing Receivable, Modifications, Out of Program, Recorded Investment	116	89
Total impaired loans and receivables	593	502
Unpaid principal balance	545	463
Related allowance for Troubled Debt Restructurings	52	44
U S Consumer Services [Member] | Card Member Receivables [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Financing Receivable, Modifications, In-Program, Recorded Investment	8	11
Financing Receivable, Modifications, Out of Program, Recorded Investment	4	3
Total impaired loans and receivables	12	14
Unpaid principal balance	11	14
Related allowance for Troubled Debt Restructurings	5	8
International Consumer and Network Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	53	52
Non-accrual loans	0	0
Financing Receivable, Modifications, In-Program, Recorded Investment	0	0
Financing Receivable, Modifications, Out of Program, Recorded Investment	0	0
Total impaired loans and receivables	53	52
Unpaid principal balance	53	51
Related allowance for Troubled Debt Restructurings	0	0
Global Commercial Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	29	24
Non-accrual loans	32	26
Financing Receivable, Modifications, In-Program, Recorded Investment	28	23
Financing Receivable, Modifications, Out of Program, Recorded Investment	24	18
Total impaired loans and receivables	113	91
Unpaid principal balance	104	85
Related allowance for Troubled Debt Restructurings	10	9
Global Commercial Services [Member] | Card Member Receivables [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	0	0
Non-accrual loans	0	0
Financing Receivable, Modifications, In-Program, Recorded Investment	18	16
Financing Receivable, Modifications, Out of Program, Recorded Investment	7	3
Total impaired loans and receivables	25	19
Unpaid principal balance	25	19
Related allowance for Troubled Debt Restructurings	$ 14	$ 12