Segment Information (Unaudited) Reconciliation to Consolidated Operating Income (Details 1) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Sales	$ 8,720		$ 9,083	$ 27,028	$ 26,587
Operating income	1,043		985	4,909	2,913
Pre-tax gain on sale of business		$ 2,000		2,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	1,035		1,049	3,247	3,047
Operating Segments [Member] | Aeronautics Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,725		2,914	8,628	8,682
Operating income	265		294	873	867
Operating Segments [Member] | Defense Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,409		1,859	4,398	5,626
Operating income	175		217	529	632
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,436		2,551	7,613	7,344
Operating income	372		370	1,177	1,070
Operating Segments [Member] | Space Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,681		2,198	7,950	6,194
Operating income	288		224	865	635
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(531)		(439)	(1,561)	(1,259)
Operating income	(65)		(56)	(197)	(157)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
FAS/CAS operating adjustment	61		108	98	316
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (53)		$ (172)	$ 1,564	$ (450)