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Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 6,700 | $ 6,973
Reportable Segments | Energy Solutions |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,085 | 1,053
Reportable Segments | Urban Solutions |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,350 | 1,211
Reportable Segments | Mission Solutions |  |
Segment Reporting Information [Line Items] |  |
Total assets | 573 | 577
Reportable Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Total assets | 267 | 509
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 3,425 | $ 3,623

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