Goodwill and Other Purchased Intangible Assets (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill (Table Amounts)
Beginning balance	$ 12,460	$ 12,466
Businesses sold and other	(10)	(6)
Ending balance	12,450	12,460
Aerospace Systems
Goodwill (Table Amounts)
Beginning balance	3,742	3,742
Businesses sold and other	0	0
Ending balance	3,742	3,742
Mission Systems
Goodwill (Table Amounts)
Beginning balance	6,704	6,706
Businesses sold and other	(10)	(2)
Ending balance	6,694	6,704
Technology Services
Goodwill (Table Amounts)
Beginning balance	2,014	2,018
Businesses sold and other	0	(4)
Ending balance	$ 2,014	$ 2,014