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Basis of Presentation and Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
ASU 2016-02 Transition [Abstract]      
Operating lease assets $ 397   $ 0
Present value of lease liabilities $ 469    
Accounting Standards Update 2016-02 [Member]      
ASU 2016-02 Transition [Abstract]      
Operating lease assets   $ 448  
Present value of lease liabilities   521  
Deferred rent liabilities   $ 73