Summary of Significant Accounting Policies Contract Estimates (Details 5) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in Accounting Estimate [Line Items]
Revenue			$ 396	$ 298	$ 447
Operating income			4,370	2,537	3,601
Net earnings			$ 4,174	$ 2,056	$ 4,896
Diluted earnings per share			$ 28.34	$ 13.53	$ 31.47
B-21 Charge			$ 0	$ 1,559	$ 0
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income			350	84	360
Net earnings			$ 277	$ 66	$ 284
Diluted earnings per share			$ 1.88	$ 0.43	$ 1.83
Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems | B-21 Program EMD Phase
Change in Accounting Estimate [Line Items]
Operating income					$ 133
Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems | B-21 Program LRIP Options [Member]
Change in Accounting Estimate [Line Items]
Operating income				$ (143)
B-21 Charge		$ 1,560
Loss Contingency, Accrual, Current			$ 1,300
Contracts Accounted for under Percentage of Completion [Member] | Space Systems | HALO Program [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 39			$ (100)