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Basis of Presentation (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
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 $ 36 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