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Business, Basis of Presentation and Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenue [Line Items]      
Revenue recognition, changes In contract estimates, cost-to-cost method, financial effect, percentage (less than) 1.80% (0.10%)  
Revenue recognition, remaining performance obligations, contract price allocated $ 11,000    
Contract with customer, unapproved change orders and/or claims, amount $ 155   $ 139
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01      
Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01      
Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 9 months    
Revenue recognition, remaining performance obligations, contract price allocated $ 6,700    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01      
Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 2 years    
Revenue recognition, remaining performance obligations, contract price allocated $ 4,300    
Maximum      
Revenue [Line Items]      
Revenue recognition, changes In contract estimates, cost-to-cost method, financial effect, percentage (less than) 5.00% 5.00%  
Change order or claim approval process, term within which expected to be completed 1 year    
Revenue Benchmark | Performance Obligation Concentration Risk | Performance Obligation, Timing Of Recognition, Remainder Of Year      
Revenue [Line Items]      
Concentration risk, percentage of total 60.70%    
Master Service and Other Service Agreements | Revenue Benchmark | Concentration Risk from Type of Arrangement      
Revenue [Line Items]      
Concentration risk, percentage of total 48.00% 40.00%  
Master Service and Other Service Agreements | Revenue Benchmark | Concentration Risk from Type of Arrangement | Point in Time      
Revenue [Line Items]      
Concentration risk, percentage of total 2.00% 2.00%