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Acquisitions - Unaudited Pro forma Financial Information (Details) - NYX - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Revenue since acquisition $ 198  
Net loss since acquisition (41)  
Revenue 3,363 $ 3,265
Net loss $ (345) $ (308)