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Contract Assets and Contract Liabilities (Contract Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]    
Contract assets $ 215 $ 185
Operating Segments | Government Solutions    
Disaggregation of Revenue [Line Items]    
Contract assets 111 123
Operating Segments | Technology Solutions    
Disaggregation of Revenue [Line Items]    
Contract assets 36 19
Operating Segments | Energy Solutions    
Disaggregation of Revenue [Line Items]    
Contract assets 68 43
Subtotal    
Disaggregation of Revenue [Line Items]    
Contract assets 215 185
Non-strategic Business    
Disaggregation of Revenue [Line Items]    
Contract assets $ 0 $ 0