Card Member Receivables and Loans (Details 2) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
U.S. Consumer Services [Member] | Card Member Receivables [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 5,561	$ 3,501
Total aging	5,601	3,518
U.S. Consumer Services [Member] | Card Member Receivables [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	15	9
U.S. Consumer Services [Member] | Card Member Receivables [Member] | 60 To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	7	3
U.S. Consumer Services [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	18	5
International Consumer and Network Services [Member] | Card Member Receivables [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	1,560	1,506
Total aging	1,579	1,526
International Consumer and Network Services [Member] | Card Member Receivables [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	7	6
International Consumer and Network Services [Member] | Card Member Receivables [Member] | 60 To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	4	4
International Consumer and Network Services [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	8	10
International Consumer and Network Services [Member] | Card Member Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	467	472
Total aging	471	476
International Consumer and Network Services [Member] | Card Member Loans [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	1	1
International Consumer and Network Services [Member] | Card Member Loans [Member] | 60 To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	1	1
International Consumer and Network Services [Member] | Card Member Loans [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	2	2
Global Corporate Payments [Member] | Card Member Receivables [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total aging	13,063	11,956
Global Corporate Payments [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	110	108
Global Small Business Services [Member] | Card Member Receivables [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	1,615	1,202
Total aging	1,633	1,218
Global Small Business Services [Member] | Card Member Receivables [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	7	9
Global Small Business Services [Member] | Card Member Receivables [Member] | 60 To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	3	2
Global Small Business Services [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Period past due	$ 8	$ 5