Goodwill and Other Purchased Intangible Assets (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill (Table Amounts)
Beginning balance	$ 12,455	$ 12,450
Acquisition of Orbital ATK	6,222
Other	(5)	5
Ending balance	18,672	12,455
Aerospace Systems
Goodwill (Table Amounts)
Beginning balance	3,742	3,742
Acquisition of Orbital ATK	418
Other	0	0
Ending balance	4,160	3,742
Innovation Systems
Goodwill (Table Amounts)
Beginning balance	0	0
Acquisition of Orbital ATK	5,256
Other	0	0
Ending balance	5,256	0
Mission Systems
Goodwill (Table Amounts)
Beginning balance	6,696	6,694
Acquisition of Orbital ATK	469
Other	(2)	2
Ending balance	7,163	6,696
Technology Services
Goodwill (Table Amounts)
Beginning balance	2,017	2,014
Acquisition of Orbital ATK	79
Other	(3)	3
Ending balance	$ 2,093	$ 2,017