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Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 11,788	$ 9,143
Reportable Segments | Urban Solutions
Segment Reporting Information [Line Items]
Total assets	1,906	1,472
Reportable Segments | Energy Solutions
Segment Reporting Information [Line Items]
Total assets	737	729
Reportable Segments | Mission Solutions
Segment Reporting Information [Line Items]
Total assets	886	734
Reportable Segments | Other
Segment Reporting Information [Line Items]
Total assets	6	72
Corporate | Corporate
Segment Reporting Information [Line Items]
Total assets	3,253	3,870
Investment in NuScale
Segment Reporting Information [Line Items]
Total assets	$ 5,000	$ 2,266

X

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