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Operating Leases - (Narratives) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 145
Variable lease cost 34
Operating lease payments 139
Right of use asset obtained in exchange for operating lease liability $ 112
Weighted average lease term 5 years 10 months 24 days
Weighted average discount rate (percent) 3.70%