Segment Information (Details 1) (Unaudited) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	$ 6,560	$ 7,255	$ 13,294	$ 14,169
Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	2,592	2,842	5,328	5,538
Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	1,791	1,984	3,599	3,866
Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	2,031	2,123	4,056	4,187
Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	656	801	1,344	1,564
Intersegment eliminations
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales and service revenues	$ (510)	$ (495)	$ (1,033)	$ (986)