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Property and Equipment, net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 88 $ 76 $ 68
Asset impairment charges $ 8 $ 18 $ 11