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Inventoried Costs, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Production costs of contracts in process $ 451 $ 476
General and administrative expenses 41 31
Inventoried costs 492 507
Progress and performance-based payments received (62) (41)
Inventoried costs, net of progress payments 430 466
Product inventory 329 317
Inventory, Net $ 759 $ 783