Segment Information (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 471	$ 561	$ 364
Depreciation and Amortization	467	462	495
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	240	387	198
Depreciation and Amortization	213	206	210
Electronic Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	111	82	76
Depreciation and Amortization	120	119	134
Information Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	28	40	27
Depreciation and Amortization	65	70	81
Technical Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	2	1	3
Depreciation and Amortization	6	7	4
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	90	51	60
Depreciation and Amortization	$ 63	$ 60	$ 66