Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Sales	$ 8,456	$ 7,119	$ 16,645	$ 13,854
Operating income	946	817	1,882	1,665
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	978	779	1,945	1,541
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,390	3,337	6,886	6,617
Operating income	361	357	743	698
Operating Segments [Member] | Innovation Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,498	400	2,936	400
Operating income	169	39	336	39
Operating Segments [Member] | Mission Systems [Member]
Segment Reporting Information [Line Items]
Sales	3,128	2,874	6,014	5,757
Operating income	408	352	791	723
Operating Segments [Member] | Technology Services [Member]
Segment Reporting Information [Line Items]
Sales	1,044	1,048	2,021	2,192
Operating income	113	95	215	217
Intersegment sales
Segment Reporting Information [Line Items]
Sales	(604)	(540)	(1,212)	(1,112)
Operating income	(73)	(64)	(140)	(136)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net FAS (service)/ CAS pension adjustment	107	137	215	264
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (139)	$ (99)	$ (278)	$ (140)