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Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |  |  |  |  |  |  |
Discount revenue | $ 6,181 |  | $ 5,700 |  |  | $ 18,264 | $ 16,830 |  |
Other | 334 |  | 372 |  |  | 1,060 | 1,112 |  |
Expenses |  |  |  |  |  |  |  |  |
Marketing and business development | 1,642 |  | 1,446 |  |  | 4,650 | 4,187 |  |
Card Member rewards | $ 2,400 |  | 2,168 |  |  | $ 7,180 | $ 6,425 |  |
Revenue Recognition Standard Impacts [Member] |  |  |  |  |  |  |  |  |
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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