Severance and Restructuring Related Costs (Details) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 29, 2018 USD ($)	Dec. 31, 2017 USD ($)		Dec. 31, 2018 USD ($) Employee	Dec. 31, 2017 USD ($) Employee	Dec. 31, 2016 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Number of employees of restructuring costs | Employee				800	1,500	700
Gain (loss) on sale of property	$ 42	$ (12)	[1]
Restructuring Reserve [Roll Forward]
Balance at beginning of period				$ 23
Additional provisions				26	$ 101	$ 17
Cash payments				(35)
Balance at end of period		$ 23		14	23
ISR Systems [Member]
Restructuring Cost and Reserve [Line Items]
Curtailment loss				5
Restructuring Reserve [Roll Forward]
Additional provisions				7	38	5
C&NS [Member]
Restructuring Reserve [Roll Forward]
Additional provisions				11	52	8
Electronic Systems [Member]
Restructuring Cost and Reserve [Line Items]
Curtailment loss				1
Restructuring Reserve [Roll Forward]
Additional provisions				8	11	4
Consolidated Entities [Member]
Restructuring Reserve [Roll Forward]
Additional provisions				$ 26	$ 101	$ 17

[1] The severance and restructuring related costs incurred during the year ended December 31, 2017 include a $12 million loss on the sale of a building in Garland, Texas in the fourth quarter of 2017.