Segment Information (Unaudited) Reconciliation to Consolidated Operating Income (Details 1) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Sales	$ 9,151		$ 8,884	$ 18,308	$ 17,504
Operating income	1,044		994	3,866	1,928
Pre-tax gain on sale of business		$ 2,000		2,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	1,117		1,031	2,212	1,998
Operating Segments [Member] | Aeronautics Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,913		2,925	5,903	5,768
Operating income	300		310	608	573
Operating Segments [Member] | Defense Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,427		1,886	2,989	3,767
Operating income	177		217	354	415
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,588		2,446	5,177	4,793
Operating income	408		347	805	700
Operating Segments [Member] | Space Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,748		2,048	5,269	3,996
Operating income	301		209	577	411
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(525)		(421)	(1,030)	(820)
Operating income	(69)		(52)	(132)	(101)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
FAS/CAS operating adjustment	18		103	37	208
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (91)		$ (140)	$ 1,617	$ (278)