Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	4
Sales	$ 8,189	$ 6,735
Operating income	936	848
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	967	762
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,496	3,280
Operating income	382	341
Operating Segments [Member] | Innovation Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,438	0
Operating income	167	0
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,886	2,883
Operating income	383	371
Operating Segments [Member] | Technology Services [Member]
Segment Reporting Information [Line Items]
Sales	977	1,144
Operating income	102	122
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	608	572
Operating income	67	72
Net FAS (service)/CAS pension adjustment [Member]
Segment Reporting Information [Line Items]
Operating income	108	127
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (139)	$ (41)