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Property and Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Capital lease and other financing obligations incurred $ 91 $ 84 $ 43
Depreciation and amortization 1,420 1,366 1,153
Property plant and equipment including that recorded under capital leases      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 184 $ 180 $ 185