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Acquisitions - Pro Forma Information (Details) - ODS [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue $ 2,306 $ 2,285 $ 4,614 $ 4,645
Business Acquisition, Pro Forma Net Income (Loss) $ (59) $ 121 $ 67 $ 208