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Claims and Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Claims and accounts receivable $ 99 $ 98
Government Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government contract receivable 73 73
Disputed costs $ 26 $ 25