Goodwill and Other Purchased Intangible Assets Goodwill Rollforward (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill (Table Amounts)
Beginning balance	$ 18,672	$ 12,455
Acquisition of Orbital ATK	37	6,222
Other	(1)	(5)
Ending balance	18,708	18,672
Aerospace Systems
Goodwill (Table Amounts)
Beginning balance	4,160	3,742
Acquisition of Orbital ATK	0	418
Other	0	0
Ending balance	4,160	4,160
Innovation Systems
Goodwill (Table Amounts)
Beginning balance	5,256	0
Acquisition of Orbital ATK	37	5,256
Other	0	0
Ending balance	5,293	5,256
Mission Systems
Goodwill (Table Amounts)
Beginning balance	7,163	6,696
Acquisition of Orbital ATK	0	469
Other	0	(2)
Ending balance	7,163	7,163
Technology Services
Goodwill (Table Amounts)
Beginning balance	2,093	2,017
Acquisition of Orbital ATK	0	79
Other	(1)	(3)
Ending balance	$ 2,092	$ 2,093