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Receivables (Details) - USD ($)
$ in Millions
Sep. 29, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 709 $ 626
Less allowances for collection losses (3) (3)
Receivables, net 706 623
Trade Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross 422 368
Cost-Plus | Unbilled Revenues    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables, gross $ 287 $ 258