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Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Total revenue $ 3,982 $ 3,734
Total segment profit 91 52
G&A (36) (59)
Foreign currency gain (loss) (13) 12
Interest income (expense), net 17 39
Earnings (loss) attributable to NCI 9 (19)
Earnings before taxes 108 91
Reportable Segments    
Segment Reporting Information [Line Items]    
Total revenue 3,982 3,734
Total cost of revenue (3,842) (3,635)
Total segment profit 131 118
Consolidation, Eliminations    
Segment Reporting Information [Line Items]    
Total revenue 58 81
Urban Solutions | Reportable Segments    
Segment Reporting Information [Line Items]    
Total revenue 2,157 1,479
Total cost of revenue (2,081) (1,427)
Total segment profit 70 50
Energy Solutions | Reportable Segments    
Segment Reporting Information [Line Items]    
Total revenue 1,206 1,432
Total cost of revenue (1,158) (1,363)
Total segment profit 47 68
Mission Solutions | Reportable Segments    
Segment Reporting Information [Line Items]    
Total revenue 597 601
Total cost of revenue (590) (575)
Total segment profit 5 22
Other | Reportable Segments    
Segment Reporting Information [Line Items]    
Total revenue 22 222
Total cost of revenue (13) (270)
Total segment profit $ 9 $ (22)