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Revenue (Revenue by Contract Type) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total revenues $ 7,339 $ 5,767 $ 5,639
Cost Reimbursable      
Disaggregation of Revenue [Line Items]      
Total revenues 4,175 2,409 2,501
Time-and-Materials      
Disaggregation of Revenue [Line Items]      
Total revenues 1,642 1,823 1,529
Fixed Price      
Disaggregation of Revenue [Line Items]      
Total revenues 1,522 1,535 1,609
Government Solutions      
Disaggregation of Revenue [Line Items]      
Total revenues 6,149 4,055 4,042
Government Solutions | Cost Reimbursable      
Disaggregation of Revenue [Line Items]      
Total revenues 4,175 2,409 2,501
Government Solutions | Time-and-Materials      
Disaggregation of Revenue [Line Items]      
Total revenues 903 608 452
Government Solutions | Fixed Price      
Disaggregation of Revenue [Line Items]      
Total revenues 1,071 1,038 1,089
Sustainable Technology Solutions      
Disaggregation of Revenue [Line Items]      
Total revenues 1,190 1,712 1,597
Sustainable Technology Solutions | Cost Reimbursable      
Disaggregation of Revenue [Line Items]      
Total revenues 0 0 0
Sustainable Technology Solutions | Time-and-Materials      
Disaggregation of Revenue [Line Items]      
Total revenues 739 1,215 1,077
Sustainable Technology Solutions | Fixed Price      
Disaggregation of Revenue [Line Items]      
Total revenues $ 451 $ 497 $ 520