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Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts $ 974 $ 927
Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 424 346
Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 550 581
Operating Segments | Subtotal    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 974 927
Operating Segments | Subtotal | Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 424 346
Operating Segments | Subtotal | Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 550 581
Operating Segments | Government Solutions    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 650 600
Operating Segments | Government Solutions | Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 318 266
Operating Segments | Government Solutions | Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 332 334
Operating Segments | Technology Solutions    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 73 73
Operating Segments | Technology Solutions | Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 22 11
Operating Segments | Technology Solutions | Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 51 62
Operating Segments | Energy Solutions    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 251 254
Operating Segments | Energy Solutions | Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 84 69
Operating Segments | Energy Solutions | Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 167 185
Operating Segments | Non-strategic Business    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 0 0
Operating Segments | Non-strategic Business | Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts 0 0
Operating Segments | Non-strategic Business | Trade & Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net of allowance for doubtful accounts $ 0 $ 0