Segment Information (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 488	$ 579	$ 473
Depreciation and amortization	544	555	550
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	184	195	211
Depreciation and amortization	200	237	238
Electronic Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	121	176	168
Depreciation and amortization	144	150	140
Information Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	41	31	50
Depreciation and amortization	121	133	138
Technical Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	1	5	3
Depreciation and amortization	4	5	8
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	141	172	41
Depreciation and amortization	$ 75	$ 30	$ 26