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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Table Text Block [Abstract] |
Revenue Recognition Standard Impact [Text Block] | The impact to the 2017 fiscal quarters and years ended December 31, 2017 and 2016 were as follows:
|  |  |  | Increase (Decrease)
|  |  |  | Three months ended |  | Year Ended December
(Millions) |  |  | December 31, 2017 |  |  | September 30, 2017 |  |  | June 30, 2017 |  |  | March 31, 2017 |  |  | 2017 |  |  | 2016
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Discount revenue |  | $ | 981 |  | $ | 930 |  | $ | 928 |  | $ | 868 |  | $ | 3,707 |  | $ | 3,699
| Other |  |  | (78) |  |  | (71) |  |  | (64) |  |  | (65) |  |  | (278) |  |  | (253)
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Marketing and business development |  |  | 617 |  |  | 591 |  |  | 593 |  |  | 549 |  |  | 2,350 |  |  | 2,420
| Card Member rewards |  | $ | 286 |  | $ | 268 |  | $ | 271 |  | $ | 254 |  | $ | 1,079 |  | $ | 1,026

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