Employee Severance and Termination Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Employees	Dec. 31, 2015 USD ($) Employees	Dec. 31, 2014 USD ($) Employees
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 17	$ 18	$ 29
Number of employees terminated | Employees	700	800	1,800
Remaining balance of employee termination costs	$ 9
Electronic Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	8	$ 8	$ 16
Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	2	4	5
Communication Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 7	6	$ 8
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Payments for employee termination costs		$ 9