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Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 3,368 $ 4,094 $ 11,327 $ 12,055
Total segment profit (loss) (496) 49 (431) 277
G&A (43) (37) (131) (147)
Foreign currency gain (loss) (4) (2) (47) 58
Interest income (expense), net 13 37 48 114
Earnings (loss) attributable to NCI (10) (29) (23) (63)
Earnings (loss) before taxes (483) 86 (383) 391
Reportable Segments        
Segment Reporting Information [Line Items]        
Total revenue 3,368 4,094 11,327 12,055
Total cost of revenue (3,817) (4,005) (11,581) (11,689)
Total segment profit (loss) (439) 117 (230) 429
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Total revenue 58 70 178 226
Urban Solutions | Reportable Segments        
Segment Reporting Information [Line Items]        
Total revenue 2,343 1,931 6,570 5,240
Total cost of revenue (2,297) (1,863) (6,447) (5,011)
Total segment profit (loss) 61 68 160 223
Energy Solutions | Reportable Segments        
Segment Reporting Information [Line Items]        
Total revenue 262 1,428 2,611 4,456
Total cost of revenue (793) (1,376) (3,077) (4,260)
Total segment profit (loss) (533) 50 (470) 193
Mission Solutions | Reportable Segments        
Segment Reporting Information [Line Items]        
Total revenue 761 635 2,120 1,940
Total cost of revenue (724) (584) (2,038) (1,819)
Total segment profit (loss) 34 45 73 108
Other | Reportable Segments        
Segment Reporting Information [Line Items]        
Total revenue 2 100 26 419
Total cost of revenue (3) (182) (19) (598)
Total segment profit (loss) $ (1) $ (46) $ 7 $ (95)