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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle\    
Operating lease ROU assets $ 521  
Operating lease liability $ 554  
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle\    
Operating lease ROU assets   $ 442
Operating lease liability   $ 446
Minimum    
New Accounting Pronouncements or Change in Accounting Principle\    
Lease renewal options 1 year  
Maximum    
New Accounting Pronouncements or Change in Accounting Principle\    
Lease renewal options 5 years