Accounts Receivable and Loans (Details 4) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Impaired loans and receivables
Loans over 90 days past due and accruing interest	$ 218	$ 218
Non-accrual loans	205	241
Financing Receivable, Modifications, In-Program, Recorded Investment	260	334
Financing Receivable, Modifications, Out of Program, Recorded Investment	84
Total impaired loans and receivables	767	793
Unpaid principal balance	720	750
Related allowance for Troubled Debt Restructurings	82	102
Accounts Receivable and Loans Textuals [Abstract]
Total loans and receivables modified as a TDR, non-accrual	28	34
Total loans and receivables modified as a TDR, past due 90 days and still accruing	18	26
Financing Receivable, Modifications, Out of Program - success, Recorded Investment	60
Financing Receivable, Modifications, Out of Program - not compliant, Recorded Investment		24
U S Card Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	162	161
Non-accrual loans	205	241
Financing Receivable, Modifications, In-Program, Recorded Investment	238	286
Financing Receivable, Modifications, Out of Program, Recorded Investment	81
Total impaired loans and receivables	686	688
Unpaid principal balance	640	646
Related allowance for Troubled Debt Restructurings	67	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	22	48
Financing Receivable, Modifications, Out of Program, Recorded Investment	3
Total impaired loans and receivables	25	48
Unpaid principal balance	25	48
Related allowance for Troubled Debt Restructurings	15	35
International Card Services [Member] | Card Member Loans [Member]
Impaired loans and receivables
Loans over 90 days past due and accruing interest	56	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	56	57
Unpaid principal balance	55	56
Related allowance for Troubled Debt Restructurings	$ 0	$ 0