Acquisitions and Divestitures Textual ( Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Business Events Textuals [Abstract] | |||
| Card Member loans and receivables held for sale | $ 0 | $ 14,992 | |
| CardMember Receivables And Loans Reserves | 0 | 224 | $ 0 |
| Total Impairment Charge | 0 | 384 | 0 |
| Impairment Of Goodwill Prepaid Services | 219 | ||
| Impairment Charge - Technology And Other Assets writedown to Fair Value | 165 | ||
| Gain on sale of HFS Portfolios | (1,218) | 0 | 0 |
| Gain on business travel joint venture transaction | 0 | $ 0 | $ 630 |
| Costco [Member] | Other Expense [Member] | |||
| Business Events Textuals [Abstract] | |||
| Gain on sale of HFS Portfolios | (1,091) | ||
| JetBlue [Member] | Other Expense [Member] | |||
| Business Events Textuals [Abstract] | |||
| Gain on sale of HFS Portfolios | $ (127) | ||