Segment Information (Unaudited) Reconciliation to Consolidated Operating Income (Details 1) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Sales	$ 8,884	$ 8,456	$ 17,504	$ 16,645
Operating income	994	946	1,928	1,882
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	1,031	993	1,998	1,971
Operating Segments [Member] | Aeronautics Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,925	2,721	5,768	5,539
Operating income	310	299	573	610
Operating Segments [Member] | Defense Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,886	1,916	3,767	3,684
Operating income	217	212	415	416
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,446	2,404	4,793	4,614
Operating income	347	338	700	661
Operating Segments [Member] | Space Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,048	1,788	3,996	3,589
Operating income	209	193	411	383
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(421)	(373)	(820)	(781)
Operating income	(52)	(49)	(101)	(99)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net FAS (service)/ CAS pension adjustment	103	107	208	215
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (140)	$ (154)	$ (278)	$ (304)