Card Member Receivables and Loans (Details 2) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Card Member receivables Total Aging | $ 22,792 | $ 20,276 |
Global Consumer Services Group [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Card Member receivables Total Aging | 6,428 | 5,384 |
Card Member loans Total aging | 581 | 561 |
Global Consumer Services Group [Member] | Card Member Receivables [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Current | 6,380 | 5,336 |
Global Consumer Services Group [Member] | Card Member Receivables [Member] | 30 to 59 Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 16 | 18 |
Global Consumer Services Group [Member] | Card Member Receivables [Member] | 60 To 89 Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 9 | 11 |
Global Consumer Services Group [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 23 | 19 |
Global Consumer Services Group [Member] | Card Member Loans [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Current | 577 | 557 |
Global Consumer Services Group [Member] | Card Member Loans [Member] | 30 to 59 Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 1 | 1 |
Global Consumer Services Group [Member] | Card Member Loans [Member] | 60 To 89 Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 1 | 1 |
Global Consumer Services Group [Member] | Card Member Loans [Member] | 90+ Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 2 | 2 |
Global Commercial Services [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Card Member receivables Total Aging | 16,364 | 14,892 |
Global Small Business Services [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Card Member receivables Total Aging | 1,633 | 1,412 |
Global Small Business Services [Member] | Card Member Receivables [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Current | 1,617 | 1,397 |
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 | 6 | 5 |
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 | 4 |
Global Small Business Services [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | 7 | 6 |
Global Corporate Payments [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Card Member receivables Total Aging | 14,731 | 13,480 |
Global Corporate Payments [Member] | Card Member Receivables [Member] | 90+ Days Past Due [Member] | | |
Financing Receivable, Recorded Investment, Aging [Abstract] | | |
Period past due | $ 119 | $ 112 |