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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Table Text Block [Abstract] |
Revenue Recognition Standard Impact [Text Block] | Beginning with the quarter ending March 31, 2018, the Company’s consolidated financial statements will reflect the adoption of the standard using the full retrosp ective method, which applies the new standard to each prior reporting period presented. The most significant impacts of the adoption are changes to the presentation of certain credit and charge card related costs that previously were netted against D iscoun t revenue, including Card Member cash-back reward costs and statement credits, corporate client incentive payments, as well as payments to third-party card issuing partners. Under the new standard, these costs are not considered components of the transacti on price of our card acceptance agreements with merchants and thus are not netted against Discount revenue, but instead recognized as expense s. Our p ayments to third-party card issuing partners will be presented net of related Other revenues earned from th e partners. These reclassifications are expected to have the following impacts to the reported re sults for the fiscal years ended:
|  |  |  | Increase (Decrease)
December 31 (Millions) |  |  | 2017 |  |  | 2016
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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