Segment Information (Unaudited) Reconciliation to Consolidated Operating Income (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Sales	$ 9,157	$ 8,620
Operating income	2,822	934
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	1,095	967
Operating Segments [Member] | Aeronautics Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,990	2,843
Operating income	308	263
Operating Segments [Member] | Defense Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,562	1,881
Operating income	177	198
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,589	2,347
Operating income	397	353
Operating Segments [Member] | Space Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,521	1,948
Operating income	276	202
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(505)	(399)
Operating income	(63)	(49)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
FAS/CAS operating adjustment	19	105
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ 1,708	$ (138)