Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Accrual For Environmental Loss Contingencies	$ 835	$ 725
Commercial Aerospace financing and other contractual commitments	13,400	$ 15,000
Other Commitment	11,000
Other Financing Arrangements [Member]
Loss Contingencies [Line Items]
Other Commitment	4,500
U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	177
Loss Contingency, Interest	113
2019 U. S. Defense Contract Management Agency Claim Against Pratt Whitney Domain [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	1,730
Loss Contingency, Interest	681
U. S. Defense Contract Management Agency Claim Against Pratt Whitney Second Claim [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	269
Loss Contingency, Interest	$ 69