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Acquisitions - Pro Forma Information (Details) - ODS [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue $ 2,164 $ 2,179 $ 6,778 $ 6,825
Business Acquisition, Pro Forma Net Income (Loss) $ 115 $ 97 $ 182 $ 301