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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Revenue $ 977 $ 1,038 $ 2,872 $ 3,092
Segment profit (loss) 52 76 142 210
Unallocated Costs        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Segment profit (loss) (87) (89) (218) (247)
Commercial: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 504 493 1,486 1,493
Segment profit (loss) 44 16 94 59
Government Services: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 291 346 856 996
Segment profit (loss) 79 125 224 320
Transportation: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 182 180 523 549
Segment profit (loss) 16 13 40 51
Divestitures | Divestitures        
Segment Reporting Information [Line Items]        
Revenue 0 19 7 54
Segment profit (loss) $ 0 $ 11 $ 2 $ 27