Basis of Presentation (Unaudited) Contract Estimates (Details 2) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Change in Accounting Estimate [Line Items]
Revenue	$ 202	$ 136
Operating income	2,822	934
Net earnings	$ 2,195	$ 868
Diluted earnings per share	$ 13.43	$ 5.15
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 190	$ 124
Net earnings	$ 150	$ 98
Diluted earnings per share	$ 0.92	$ 0.58