Loans and Accounts Receivable (Details 4) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 266	$ 260
Non-accrual loans	190	169
Financing Receivable, Modifications, In-Program, Recorded Investment	214	230
Financing Receivable, Modifications, Out of Program, Recorded Investment	182	171
Total impaired loans and receivables	852	830
Unpaid principal balance	785	767
Related allowance for Troubled Debt Restructurings	69	88
Accounts Receivable and Loans Textuals [Abstract]
Total loans and receivables modified as a TDR, non-accrual	7	11
Total loans and receivables modified as a TDR, past due 90 days and still accruing	18	20
Financing Receivable, Modifications, Out of Program - success, Recorded Investment	139	132
Financing Receivable, Modifications, Out of Program - not compliant, Recorded Investment	43	39
U S Consumer Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	175	178
Non-accrual loans	156	139
Financing Receivable, Modifications, In-Program, Recorded Investment	153	165
Financing Receivable, Modifications, Out of Program, Recorded Investment	132	129
Total impaired loans and receivables	616	611
Unpaid principal balance	560	558
Related allowance for Troubled Debt Restructurings	47	51
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	10	11
Financing Receivable, Modifications, Out of Program, Recorded Investment	8	6
Total impaired loans and receivables	18	17
Unpaid principal balance	18	17
Related allowance for Troubled Debt Restructurings	4	7
International Consumer and Network Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	58	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	58	52
Unpaid principal balance	57	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	33	30
Non-accrual loans	34	30
Financing Receivable, Modifications, In-Program, Recorded Investment	26	26
Financing Receivable, Modifications, Out of Program, Recorded Investment	27	26
Total impaired loans and receivables	120	112
Unpaid principal balance	110	103
Related allowance for Troubled Debt Restructurings	9	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	25	28
Financing Receivable, Modifications, Out of Program, Recorded Investment	15	10
Total impaired loans and receivables	40	38
Unpaid principal balance	40	38
Related allowance for Troubled Debt Restructurings	$ 9	$ 21