Summary of Significant Accounting Policies Contract Estimates (Details 5) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in Accounting Estimate [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period		$ 298	$ 447	$ 568
Operating income		2,537	3,601	5,651
Net earnings		$ 2,056	$ 4,896	$ 7,005
Diluted earnings per share		$ 13.53	$ 31.47	$ 43.54
B-21 Charge		$ 1,559	$ 0	$ 0
Space Systems
Change in Accounting Estimate [Line Items]
Inventory Write-down		43	45
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income		84	360	527
Net earnings		$ 66	$ 284	$ 416
Diluted earnings per share		$ 0.43	$ 1.83	$ 2.59
F-35 Program | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems
Change in Accounting Estimate [Line Items]
Operating income				$ (135)
B-21 Program LRIP Options [Member] | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems
Change in Accounting Estimate [Line Items]
Operating income	$ (143)
B-21 Charge	(1,560)
Inventory Write-down	45
Loss Contingency Accrual	1,370	$ 1,370
Loss Contingency, Accrual, Current	631	631
Loss Contingency, Accrual, Noncurrent	$ 740	740
B-21 Program EMD Phase | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems
Change in Accounting Estimate [Line Items]
Operating income			$ 133
HALO Program [Member] | Contracts Accounted for under Percentage of Completion [Member] | Space Systems
Change in Accounting Estimate [Line Items]
Operating income		$ (100)