Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales	$ 6,108	$ 5,984	$ 6,039	$ 5,848	$ 6,157	$ 6,106	$ 6,294	$ 6,104	$ 23,979	$ 24,661	$ 25,218
Operating Income (Loss)	762	769	820	845	768	790	806	759	3,196	3,123	3,130
Intersegment Eliminations [Member]
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales									1,990	1,941	2,084
Operating Income (Loss)									236	256	258
Intersegment Eliminations [Member] | Aerospace Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales									176	149	171
Operating Income (Loss)									22	18	20
Intersegment Eliminations [Member] | Electronic Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales									637	629	607
Operating Income (Loss)									109	125	110
Intersegment Eliminations [Member] | Information Systems
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales									537	504	682
Operating Income (Loss)									57	63	78
Intersegment Eliminations [Member] | Technical Services
Intersegment sales and operating income (Table Amounts) [Abstract]
Total sales									640	659	624
Operating Income (Loss)									$ 48	$ 50	$ 50