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Revenue (Revenue by Contract Type) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total net revenue $ 1,536 $ 1,385 $ 2,997 $ 2,922
Cost Reimbursable        
Disaggregation of Revenue [Line Items]        
Total net revenue 728 570 1,417 1,153
Time-and-Materials        
Disaggregation of Revenue [Line Items]        
Total net revenue 413 437 815 965
Fixed Price        
Disaggregation of Revenue [Line Items]        
Total net revenue 395 378 765 804
Government Solutions        
Disaggregation of Revenue [Line Items]        
Total net revenue 1,231 953 2,395 1,935
Government Solutions | Cost Reimbursable        
Disaggregation of Revenue [Line Items]        
Total net revenue 728 570 1,417 1,153
Government Solutions | Time-and-Materials        
Disaggregation of Revenue [Line Items]        
Total net revenue 226 140 438 264
Government Solutions | Fixed Price        
Disaggregation of Revenue [Line Items]        
Total net revenue 277 243 540 518
Sustainable Technology Solutions        
Disaggregation of Revenue [Line Items]        
Total net revenue 305 432 602 987
Sustainable Technology Solutions | Cost Reimbursable        
Disaggregation of Revenue [Line Items]        
Total net revenue 0 0 0 0
Sustainable Technology Solutions | Time-and-Materials        
Disaggregation of Revenue [Line Items]        
Total net revenue 187 297 377 701
Sustainable Technology Solutions | Fixed Price        
Disaggregation of Revenue [Line Items]        
Total net revenue $ 118 $ 135 $ 225 $ 286