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Property and Equipment, net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 101 $ 96 $ 88
Asset impairment charges $ 0 $ 9 $ 8