Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Contract with Customer, Asset, Change	$ 5,469
Contract asset write-offs or reclassifications related to precision guided munitions to certain Middle Eastern customers	335
Impairment and incremental credit loss reserves on contract assets	132
Contract with Customer, Liability, Change	3,875
Revenue reversed related to precision guided munitions to certain Middle Eastern customers	119
Impairment on inventory that cannot be utilized related to precision guided munitions to certain Middle Eastern customers	516
Backlog reversed related to precision guided munitions for certain Middle Eastern customers	755
Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers	405
Contract Receivable Retainage	98
Contract with Customer, Asset, Allowance for Credit Loss	177
Contract with Customer, Asset, Allowance for Credit Loss, Writeoff	111
Contract with Customer, Liability, Revenue Recognized	2,763	$ 2,850	$ 2,269
Pratt and Whitney [Member]
Capitalized Contract Cost [Line Items]
Unfavorable EAC adjustment related to the restructuring of a customer contract	129
COVID 19 [Member]
Capitalized Contract Cost [Line Items]
Contract with Customer, Asset, Credit Loss Expense (Reversal)	132
Raytheon Company [Member]
Capitalized Contract Cost [Line Items]
Contract with Customer, Asset, Change	5,500
Contract with Customer, Liability, Change	$ 3,800