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Business Combinations and Divestitures Other 2019 Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,832 | $ 2,692 | $ 2,741
Other Hospitality Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 20 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 2 |  |
Goodwill | 17 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 6 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 8 years |  |

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