Contract Assets and Contract Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]
Change in net contract assets (liabilities)	$ 577
Change in contract assets	528
Total contract value related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	1,200
Sales recognized for work performed to date related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	400
Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	500
Net contract assets related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	100
Net contract liabilities related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	200
Contract assets expected to be collected outside of one year	24
Retentions	94
Retentions to be collected next year	20
Revenue recognized on contract liabilities	$ 1,919	$ 1,453	$ 1,434