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Operating Information by Segment and Geographic Area - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 31, 2024
Segment Reporting Information [Line Items]                
Cash divestiture         $ 131 $ 0 $ 0  
Disposal Group, Not Discontinued Operations | Stork                
Segment Reporting Information [Line Items]                
Loss on sale of investments   $ 93            
Cash transferred   31       31    
Divestiture, negative impact on earnings from foreign currency translation   $ 33            
NuScale cash deconsolidated $ 67              
Gain on sale of investments $ 11              
Disposal Group, Not Discontinued Operations | AMECO                
Segment Reporting Information [Line Items]                
Loss on sale of investments     $ 60          
Divestiture, negative impact on earnings from foreign currency translation     35          
NuScale cash deconsolidated     144          
Cash divestiture     $ 17          
NuScale                
Segment Reporting Information [Line Items]                
Recognized pre-tax gain on deconsolidation       $ 1,600        
Share price (in dollars per share)               $ 13.15
Number of shares retained after deconsolidation       126,000,000        
Additional recognized pre-tax gain on deconsolidation       $ 604        
Urban Solutions | LAX Automated People Mover project                
Segment Reporting Information [Line Items]                
Effect of forecast revision on estimated project cost         $ 59      
Effect of forecast revision on estimated project cost (in dollars per share)         $ 0.34      
Energy Solutions                
Segment Reporting Information [Line Items]                
Effect of forecast revision on estimated project cost         $ 66      
Effect of forecast revision on estimated project cost (in dollars per share)         $ 0.26      
Expense from embedded foreign currency derivatives         $ 47 $ (17)    
Energy Solutions | Single customer | Consolidated revenue | Customer concentration                
Segment Reporting Information [Line Items]                
Concentration risk (as a percentage)           10.00% 14.00%  
Energy Solutions | Upstream Project                
Segment Reporting Information [Line Items]                
Effect of forecast revision on estimated project cost           $ 91    
Effect of forecast revision on estimated project cost (in dollars per share)           $ 0.53    
Government Segment | Consolidated revenue | Customer concentration                
Segment Reporting Information [Line Items]                
Concentration risk (as a percentage)         16.00% 9.00% 16.00%  
Mission Solutions | Weapons Facility Project                
Segment Reporting Information [Line Items]                
Effect of forecast revision on estimated project cost         $ 30      
Effect of forecast revision on estimated project cost (in dollars per share)         $ 0.17