Contingent Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 811	$ 725
Other Commitment	12,600
Other Financing Arrangements [Member]
Loss Contingencies [Line Items]
Other Commitment	$ 4,900
Commercial Aerospace [Member]
Loss Contingencies [Line Items]
Financing and other contractual commitments		$ 15,000
2019 U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Domain]
Loss Contingencies [Line Items]
Loss Contingency Allegations	As previously disclosed, in April 2019, a Divisional Administrative Contracting Officer (DACO) of the United States DCMA asserted a claim against Pratt & Whitney to recover overpayments of approximately $1.73 billion plus interest ($621 million at June 30, 2020).
2013 U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member]
Loss Contingencies [Line Items]
Loss Contingency Allegations	As previously disclosed, in December 2013, a DCMA DACO asserted a claim against Pratt & Whitney to recover overpayments of approximately $177 million plus interest ($105 million at June 30, 2020).
2018 U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member]
Loss Contingencies [Line Items]
Loss Contingency Allegations	In December 2018, a DCMA DACO issued a second claim against Pratt & Whitney that similarly alleges that its method of determining the cost of collaborator parts does not comply with the cost accounting standards for calendar years 2013 through 2017. This second claim demands payment of $269 million plus interest ($64 million at June 30, 2020), which we also believe is without merit and which Pratt & Whitney appealed to the ASBCA in January 2019.