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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

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