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Operating Leases - (Narratives) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Leases [Abstract]    
Operating lease cost $ 39 $ 103
Variable lease cost $ 10 25
Operating lease payments   99
Right of use asset obtained in exchange for operating lease liability   $ 51
Weighted average lease term 5 years 10 months 24 days 5 years 10 months 24 days
Weighted average discount rate (percent) 3.70% 3.70%