Segment Information (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 331	$ 492	$ 585
Depreciation and Amortization	510	544	555
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	154	184	195
Depreciation and Amortization	196	200	237
Electronic Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	84	121	176
Depreciation and Amortization	139	144	150
Information Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	40	45	37
Depreciation and Amortization	100	121	133
Technical Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	3	1	5
Depreciation and Amortization	4	4	5
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	50	141	172
Depreciation and Amortization	$ 71	$ 75	$ 30