Segment Information (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 561	$ 364	$ 331
Depreciation and Amortization	462	495	510
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	387	198	154
Depreciation and Amortization	206	210	196
Electronic Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	82	76	84
Depreciation and Amortization	119	134	139
Information Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	40	27	40
Depreciation and Amortization	70	81	100
Technical Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	1	3	3
Depreciation and Amortization	7	4	4
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	51	60	50
Depreciation and Amortization	$ 60	$ 66	$ 71