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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Effective tax rate | 9.90% |  | 33.80% | 12.90% | 26.20% |
Provisional discrete net tax expense (benefit) | $ 19 |  |  |  |  |
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% |  |
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 Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax And Effective Tax Rate [Abstract] |  |  |  |  |  |
Provisional discrete net tax expense (benefit) | $ (32) | $ 434 |  | $ (16) |  |
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 |  |  | $ 5 |  | $ 8 |

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