Acquisition of Orbital ATK (Details 1) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenues	$ 8,156	$ 8,085	$ 7,119	$ 6,735	$ 6,552	$ 6,569	$ 6,473	$ 6,410	$ 30,095	$ 26,004	$ 24,706
Operating Income (Loss)	943	1,172	817	848	672	829	864	853	3,780	3,218	3,277
Net earnings	$ 356	$ 1,244	$ 789	$ 840	$ 672	$ 750	$ 677	$ 770	3,229	2,869	2,043
Business Combination, Acquisition Related Costs									29
Operating Segments [Member]
Business Acquisition [Line Items]
Operating Income (Loss)									3,447	2,903	2,864
Innovation Systems | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues									3,276	0	0
Operating Income (Loss)									343	$ 0	$ 0
Net earnings									$ 273