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Segment Information - Revenues and Intersegment Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total revenues $ 2,826 $ 2,693 $ 2,879
Operating Segments | ASC      
Segment Reporting Information [Line Items]      
Total revenues 1,831 1,733 1,940
Operating Segments | IMS      
Segment Reporting Information [Line Items]      
Total revenues 1,021 983 959
Corporate & Eliminations      
Segment Reporting Information [Line Items]      
Total revenues (26) (23) (20)
Corporate & Eliminations | ASC      
Segment Reporting Information [Line Items]      
Total revenues (25) (21) (19)
Corporate & Eliminations | IMS      
Segment Reporting Information [Line Items]      
Total revenues $ (1) $ (2) $ (1)