Basis of Presentation (Unaudited) Contract Estimates (Details 2) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Change in Accounting Estimate [Line Items]
Revenue	$ 160	$ 125	$ 362	$ 261
Operating income	1,044	994	3,866	1,928
Net earnings	$ 1,037	$ 1,005	$ 3,232	$ 1,873
Diluted earnings per share	$ 6.42	$ 6.01	$ 19.89	$ 11.16
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 154	$ 112	$ 344	$ 236
Net earnings	$ 122	$ 88	$ 272	$ 186
Diluted earnings per share	$ 0.76	$ 0.53	$ 1.67	$ 1.11