Restructuring and Asset Impairment Charges (Details Textual) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Restructuring and Asset Impairment Charges (Textual) [Abstract]
Restructuring and asset impairment charges	$ 2	$ 6	$ 16	$ 42
2010 Defense Segment Realignment Activities [Member]
Restructuring and Asset Impairment Charges (Textual) [Abstract]
Restructuring charge related strategic realignment of defense segment		6		42
Defense [Member]
Restructuring and Asset Impairment Charges (Textual) [Abstract]
Restructuring and asset impairment charges	$ 2		$ 16