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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, liability $ 723  
Operating lease, right-of-use asset $ 675  
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, liability   $ 383
Operating lease, right-of-use asset   $ 343