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Operating Leases - (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 210 $ 145
Operating lease impairment loss 30  
Variable lease cost 39 34
Operating lease payments 165 139
Right of use asset obtained in exchange for operating lease liability $ 138 $ 112
Weighted average lease term 5 years 9 months 18 days 5 years 10 months 24 days
Weighted average discount rate (percent) 3.20% 3.70%