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Inventoried Costs, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Production costs of contracts in process $ 402 $ 312
General and administrative expenses 16 30
Inventoried costs 418 342
Progress and performance-based payments received (41) (41)
Inventoried costs, net of progress payments 377 301
Product inventory 277 97
Inventory, Net $ 654 $ 398