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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Reportable segments, number | segment	3
Revenue	$ 3,858	$ 4,140	$ 4,163
Segment profit (loss)	176	237	265
Commercial:
Segment Reporting Information [Line Items]
Revenue	1,992	2,017	2,104
Segment profit (loss)	124	95	98
Government:
Segment Reporting Information [Line Items]
Revenue	1,150	1,307	1,268
Segment profit (loss)	294	409	375
Transportation:
Segment Reporting Information [Line Items]
Revenue	709	746	719
Segment profit (loss)	49	72	82
Other:
Segment Reporting Information [Line Items]
Revenue	7	70	72
Other: | Education
Segment Reporting Information [Line Items]
Revenue	0	0	0
Segment profit (loss)	0	1	9
Other: | Divestitures
Segment Reporting Information [Line Items]
Revenue	7	70	72
Segment profit (loss)	2	32	33
Unallocated Costs
Segment Reporting Information [Line Items]
Revenue	0	0	0
Segment profit (loss)	$ (293)	$ (372)	$ (332)

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