Basis of Presentation (Unaudited) Contract Estimates (Details 1) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in Accounting Estimate [Line Items]
Revenue	$ 125	$ 154	$ 261	$ 320
Operating income	994	946	1,928	1,882
Net earnings	$ 1,005	$ 861	$ 1,873	$ 1,724
Diluted earnings per share	$ 6.01	$ 5.06	$ 11.16	$ 10.11
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating income	$ 112	$ 158	$ 236	$ 296
Net earnings	$ 88	$ 125	$ 186	$ 234
Diluted earnings per share	$ 0.53	$ 0.73	$ 1.11	$ 1.37