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Revenue (Revenue by Product Line) (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
Other countries      
Disaggregation of Revenue [Line Items]      
Total revenues 39 193 111
Government Solutions      
Disaggregation of Revenue [Line Items]      
Total revenues 6,149 4,055 4,042
Government Solutions | Other countries      
Disaggregation of Revenue [Line Items]      
Total revenues 1 56 55
Government Solutions | Science & Space      
Disaggregation of Revenue [Line Items]      
Total revenues 1,018 967 863
Government Solutions | Defense & Intel      
Disaggregation of Revenue [Line Items]      
Total revenues 1,475 959 782
Government Solutions | Readiness & Sustainment      
Disaggregation of Revenue [Line Items]      
Total revenues 2,644 1,153 1,400
Government Solutions | International      
Disaggregation of Revenue [Line Items]      
Total revenues 1,012 976 997
Sustainable Technology Solutions      
Disaggregation of Revenue [Line Items]      
Total revenues 1,190 1,712 1,597
Sustainable Technology Solutions | Other countries      
Disaggregation of Revenue [Line Items]      
Total revenues $ 38 $ 137 $ 56