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Basis of Presentation (Details)
$ in Millions
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset, including amounts held for sale $ 858
Right-of-use asset, held for sale 46
Retained Earnings | Accounting Standards Update 2016-02  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of new accounting principle in period of adoption 61
Retained Earnings | Group of Properties in Latin America | Accounting Standards Update 2016-02  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of new accounting principle in period of adoption $ 82