Severance and Restructuring Related Costs (Details) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Employee	Dec. 31, 2016 USD ($) Employee	Dec. 31, 2015 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs				$ 91	$ 13	$ 14
Number of employees of restructuring costs | Employee				1,500	700	800
Gain (loss) on sale of property		$ (12)	$ 42
Severance and Restructuring Related Liability [Roll Forward]
Balance at beginning of period				$ 9
Additional provisions				101
Cash payments				(87)
Balance at end of period		$ 23		23	$ 9
Electronic Systems [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs	[1]			14	5	$ 4
Curtailment loss				1
Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs	[1]			24	2	4
Curtailment loss				5
Communication Systems [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs	[2]			48	7	6
Sensor Systems [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs	[3]			15	3	4
Consolidated [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring costs				$ 101	$ 17	$ 18

[1] The severance and restructuring related costs incurred during the year ended December 31, 2017 include $1 million and $5 million of salaried employee pension plan curtailment losses for Electronic Systems and Aerospace Systems segments, respectively. See Note 19 for additional information.

[2] The severance and restructuring related costs incurred during the year ended December 31, 2017 exclude a pre-tax gain of $42 million on the sale of the Company's property in San Carlos, California in the second quarter of 2017.

[3] 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.