Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total assets by segment (Table Amounts) [Abstract]
Total assets	$ 26,543	$ 25,411
Aerospace Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	6,657	6,525
Electronic Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	4,551	4,705
Information Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	6,940	7,144
Technical Services
Total assets by segment (Table Amounts) [Abstract]
Total assets	1,313	1,352
Total segment
Total assets by segment (Table Amounts) [Abstract]
Total assets	19,461	19,726
Corporate
Total assets by segment (Table Amounts) [Abstract]
Total assets	$ 7,082	$ 5,685