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Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total assets $ 6,811 $ 6,973
Reportable Segments | Energy Solutions    
Segment Reporting Information [Line Items]    
Total assets 956 1,053
Reportable Segments | Urban Solutions    
Segment Reporting Information [Line Items]    
Total assets 1,336 1,211
Reportable Segments | Mission Solutions    
Segment Reporting Information [Line Items]    
Total assets 585 577
Reportable Segments | Other    
Segment Reporting Information [Line Items]    
Total assets 226 509
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 3,708 $ 3,623