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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
Schedule of Equity Method Investments [Line Items] |  |  |
Future lease payments due from franchisees on a nominal basis | $ 725 |  |
Reclassification of Retained Earnings to Common Stock for Share Repurchase | 1,915 | $ 5,399 | $ 1,124
Retained Earnings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Employee Stock Option and SARs Exercises, Value | $ 20 |  |

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