Summary of Significant Accounting Policies Contract Estimates (Details 4) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Accounting Estimate [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period			$ 568	$ 504	$ 538
Operating income			5,651	4,065	3,969
Net earnings			$ 7,005	$ 3,189	$ 2,248
Diluted earnings per share			$ 43.54	$ 19.03	$ 13.22
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income			$ 527	$ 466	$ 480
Net earnings			$ 416	$ 368	$ 379
Diluted earnings per share			$ 2.59	$ 2.20	$ 2.23
F-35 Program | Contracts Accounted for under Percentage of Completion [Member] | Aeronautics Systems
Change in Accounting Estimate [Line Items]
Operating income	$ (93)	$ (42)