Acquisition of Orbital ATK Operating Results Post Acquisition (Details 1) - USD ($) $ in Millions		3 Months Ended								7 Months Ended	12 Months Ended
	Jun. 06, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 7,742
Revenues		$ 10,212	$ 9,083	$ 8,884	$ 8,620	$ 8,721	$ 8,475	$ 8,456	$ 8,189		$ 36,799	$ 33,841	$ 30,095
Operating Income (Loss)		1,152	985	994	934	1,136	951	946	936		4,065	3,969	3,780
Net earnings		$ 330	$ 986	$ 1,005	$ 868	$ (409)	$ 933	$ 861	$ 863		3,189	2,248	3,229
Business Combination, Acquisition Related Costs												29
Operating Segments [Member]
Business Acquisition [Line Items]
Operating Income (Loss)											4,188	3,978	3,514
Operating Segments [Member] | Space Systems
Business Acquisition [Line Items]
Revenues										$ 3,100	8,744	7,425	5,845
Operating Income (Loss)										342	$ 893	$ 794	$ 644
Net earnings										$ 273