Accounts Receivable and Loans (Details 4) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 241	$ 218
Non-accrual loans	175	241
Financing Receivable, Modifications, In-Program, Recorded Investment	250	334
Financing Receivable, Modifications, Out of Program, Recorded Investment	113
Total impaired loans and receivables	779	793
Unpaid principal balance	728	750
Related allowance for Troubled Debt Restructurings	84	102
Accounts Receivable and Loans Textuals [Abstract]
Total loans and receivables modified as a TDR, non-accrual	25	34
Total loans and receivables modified as a TDR, past due 90 days and still accruing	19	26
Financing Receivable, Modifications, Out of Program - success, Recorded Investment	82
Financing Receivable, Modifications, Out of Program - not compliant, Recorded Investment	31
U S Card Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	192	161
Non-accrual loans	175	241
Financing Receivable, Modifications, In-Program, Recorded Investment	224	286
Financing Receivable, Modifications, Out of Program, Recorded Investment	109
Total impaired loans and receivables	700	688
Unpaid principal balance	649	646
Related allowance for Troubled Debt Restructurings	66	67
U S Card 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	26	48
Financing Receivable, Modifications, Out of Program, Recorded Investment	4
Total impaired loans and receivables	30	48
Unpaid principal balance	30	48
Related allowance for Troubled Debt Restructurings	18	35
International Card Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	49	57
Non-accrual loans	0	0
Financing Receivable, Modifications, In-Program, Recorded Investment	0	0
Financing Receivable, Modifications, Out of Program, Recorded Investment	0
Total impaired loans and receivables	49	57
Unpaid principal balance	49	56
Related allowance for Troubled Debt Restructurings	$ 0	$ 0