Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Total assets by segment (Table Amounts) [Abstract]
Total assets	$ 26,572	$ 26,381
Aerospace Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	6,844	6,490
Electronic Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	4,366	4,400
Information Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	6,725	6,887
Technical Services
Total assets by segment (Table Amounts) [Abstract]
Total assets	1,539	1,367
Total segment
Total assets by segment (Table Amounts) [Abstract]
Total assets	19,474	19,144
Corporate
Total assets by segment (Table Amounts) [Abstract]
Total assets	$ 7,098	$ 7,237