Segment Information (Unaudited) Sales by Customer Type (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue, Major Customer [Line Items]
Revenues	$ 9,881	$ 9,468
US Government
Revenue, Major Customer [Line Items]
Revenues	$ 8,464	$ 8,023
Sales percentage	86.00%	84.00%
International(2)
Revenue, Major Customer [Line Items]
Revenues	$ 1,281	$ 1,286
Sales percentage	13.00%	14.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 136	$ 159
Sales percentage	1.00%	2.00%
Aeronautics Systems [Member] | US Government
Revenue, Major Customer [Line Items]
Revenues	$ 2,694	$ 2,290
Sales percentage	83.00%	83.00%
Aeronautics Systems [Member] | International(2)
Revenue, Major Customer [Line Items]
Revenues	$ 540	$ 478
Sales percentage	17.00%	17.00%
Aeronautics Systems [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 15	$ 5
Sales percentage	0.00%	0.00%
Aeronautics Systems [Member] | Intersegment Sales [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 34	$ 41
Aeronautics Systems [Member] | Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenues	3,283	2,814
Defense Systems [Member] | US Government
Revenue, Major Customer [Line Items]
Revenues	$ 1,591	$ 1,451
Sales percentage	86.00%	83.00%
Defense Systems [Member] | International(2)
Revenue, Major Customer [Line Items]
Revenues	$ 235	$ 289
Sales percentage	13.00%	16.00%
Defense Systems [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 21	$ 20
Sales percentage	1.00%	1.00%
Defense Systems [Member] | Intersegment Sales [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 52	$ 45
Defense Systems [Member] | Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenues	1,899	1,805
Mission Systems [Member] | US Government
Revenue, Major Customer [Line Items]
Revenues	$ 1,979	$ 1,973
Sales percentage	80.00%	80.00%
Mission Systems [Member] | International(2)
Revenue, Major Customer [Line Items]
Revenues	$ 464	$ 475
Sales percentage	19.00%	19.00%
Mission Systems [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 33	$ 24
Sales percentage	1.00%	1.00%
Mission Systems [Member] | Intersegment Sales [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 385	$ 335
Mission Systems [Member] | Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenues	2,861	2,807
Space Systems [Member] | US Government
Revenue, Major Customer [Line Items]
Revenues	$ 2,200	$ 2,309
Sales percentage	95.00%	94.00%
Space Systems [Member] | International(2)
Revenue, Major Customer [Line Items]
Revenues	$ 42	$ 44
Sales percentage	2.00%	2.00%
Space Systems [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 67	$ 110
Sales percentage	3.00%	4.00%
Space Systems [Member] | Intersegment Sales [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 171	$ 105
Space Systems [Member] | Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 2,480	$ 2,568