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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  |  |
Discount revenue | $ 19,186 | $ 18,680 | $ 19,297
Other | 1,732 | 2,029 | 2,033
Expenses |  |  |
Marketing and promotion | 3,217 | 3,650 | 3,109
Card Member rewards | 7,608 | 6,793 | $ 6,996
Revenue Recognition Standard [Member] |  |  |
Revenues |  |  |
Discount revenue | 3,707 | 3,699 |
Other | (278) | (253) |
Expenses |  |  |
Marketing and promotion | 2,350 | 2,420 |
Card Member rewards | $ 1,079 | $ 1,026 |

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