Acquisitions and Divestitures Textual ( Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Business Events Textuals [Abstract] | ||
| Card Member loans and receivables held for sale | $ 14,992 | $ 0 |
| CardMember Receivables And Loans Reserves | 224 | |
| Total Impairment Charge | 384 | |
| Impairment Of Goodwill Prepaid Services | 219 | |
| Impairment Charge - Technology And Other Assets writedown to Fair Value | 165 | |
| Gain on business travel joint venture transaction | $ 630 | |
| Airline [Member] | JetBlue [Member] | ||
| Business Events Textuals [Abstract] | ||
| Card Member loans and receivables held for sale | 1,100 | |
| Retail | Costco [Member] | ||
| Business Events Textuals [Abstract] | ||
| Card Member loans and receivables held for sale | $ 13,900 | |