Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Contracts in process	$ 862	$ 647
Inventory, Raw Materials, Net of Reserves	357	338
Inventory, Work in Process, Net of Reserves	92	72
Inventory, Finished Goods, Net of Reserves	59	52
Total product inventory	508	462
Inventoried costs, net	$ 1,370	$ 1,109