Segment Information (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Total assets by segment (Table Amounts) [Abstract]
Assets of discontinued operations		$ 5,212
Total assets	25,411	31,410
Aerospace Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	6,574	6,548
Electronic Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	4,705	4,893
Information Systems
Total assets by segment (Table Amounts) [Abstract]
Total assets	7,144	7,467
Technical Services
Total assets by segment (Table Amounts) [Abstract]
Total assets	1,303	1,381
Total segment
Total assets by segment (Table Amounts) [Abstract]
Total assets	19,726	20,289
Corporate
Total assets by segment (Table Amounts) [Abstract]
Total assets	$ 5,685	$ 5,909