Contract Asset and Liability (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Apr. 03, 2020	Dec. 31, 2019
Revenue from contract with customer [Line Items]
Contract assets	$ 9,617		$ 9,617			$ 4,462
Contract liabilities, current	(12,208)		(12,208)			(9,014)
Contract liabilities, non-current (included within Other long-term liabilities)	(120)		(120)			0
Net contract liabilities	(2,711)		(2,711)			$ (4,552)
Contract with Customer, Asset, Change			5,200
Contract with Customer, Liability, Change			(3,300)
Contract with Customer, Liability, Revenue Recognized	480	$ 770	2,288	$ 2,308
Contract with Customer, Asset, Allowance for Credit Loss	169		169
Total contract value related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	1,200		1,200
Sales recognized for work performed to date related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	150		150		$ 400
Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	450		450
Net contract assets related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	200		200
Net contract liabilities related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval	100		100
Contract with Customer, Asset, Allowance for Credit Loss, Writeoff			111
Raytheon Company [Member]
Revenue from contract with customer [Line Items]
Contract with Customer, Asset, Change			5,300
Contract with Customer, Liability, Change			(3,500)
COVID-19 [Member]
Revenue from contract with customer [Line Items]
Contract with Customer, Asset, Credit Loss Expense (Reversal)			127
Pratt & Whitney [Member]
Revenue from contract with customer [Line Items]
Unfavorable EAC adjustment related to the restructuring of a customer contract	$ 129		$ 129