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Claims and Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Claims and accounts receivable $ 30 $ 30
Government Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government contract receivable 1 1
Disputed costs $ 29 $ 29