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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 36 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Effective tax rate | 15.10% |  | 20.20% | 13.70% | 23.50% |
Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Provisional discrete net tax expense (benefit) | $ (16) | $ 434 |  | $ (32) |  |
Equipment [Member] | Franchise and property expenses [Member] | Unallocated and General and administrative expenses [Domain] |  |  |  |  |  |
Costs associated with KFC U.S. Acceleration Agreement |  |  |  |  |  | $ 115
Equipment [Member] | Franchise and property expenses [Member] | Unallocated and General and administrative expenses [Domain] | Previously Reported [Member] |  |  |  |  |  |
Costs associated with KFC U.S. Acceleration Agreement |  |  | $ 4 |  | $ 12 |
Tax Year 2018 [Member] |  |  |  |  |  |
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Limit on deductibility of interest expense |  |  |  | 30.00% |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |  |
Tax Year 2017 [Member] |  |  |  |  |  |
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  |

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