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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Capitalized computer software $ 175 $ 160 $ 135
Depreciation 145 133 $ 122
Capitalized computer software, net $ 301 $ 298