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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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