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Property and Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment      
Right-of-use asset obtained in exchange for finance lease liability $ 21 $ 215  
Depreciation and amortization 3,714 2,444 $ 1,420
Property plant and equipment including that recorded under capital leases      
Property, Plant and Equipment      
Depreciation and amortization $ 252 $ 201 $ 184