Summary of Significant Accounting Policies (Unaudited) Contract Estimates (Details 2) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2023
Change in Accounting Estimate [Line Items]
Operating income	$ 989	$ 573
Net earnings	$ 875	$ 481
Diluted earnings per share	$ 6.14	$ 3.32
B-21 loss provision	$ 0	$ 477
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Revenue	(8)	38
Operating income	(80)	(100)
Net earnings	$ (63)	$ (79)
Diluted earnings per share	$ (0.44)	$ (0.55)
B-21 Program LRIP Options 1-5 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]
Change in Accounting Estimate [Line Items]
B-21 loss provision		$ 477	$ 1,560
Loss Contingency Accrual	$ 1,000
B-21 Program LRIP Options 1-4 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]
Change in Accounting Estimate [Line Items]
Operating income	(157)
GEM 63 Program | Contracts Accounted for under Percentage of Completion [Member] | Space Systems [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ (71)
B-21 Program LRIP Options 1-2 | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems [Member]
Change in Accounting Estimate [Line Items]
Operating income		$ (226)