Guarantees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Product Warranty Liability [Line Items]
Balance as of January 1	$ 1,057	$ 1,033
Warranties and performance guarantees issued	113	90
Settlements made	(69)	(87)
Other	(1)	(11)
Balance as of March 31	1,100	$ 1,025
Commercial Aerospace Financing Arrangements
Product Warranty Liability [Line Items]
Maximum Potential Payment	314		$ 322
Carrying Amount of Liability	6		6
Guarantee Type, Other
Product Warranty Liability [Line Items]
Carrying Amount of Liability	118		120
third party guarantees
Product Warranty Liability [Line Items]
Maximum Potential Payment	379		386
Carrying Amount of Liability	2		3
Commercial Aerospace [Member]
Product Warranty Liability [Line Items]
Partner Share of Guarantor Obligations, Maximum Exposure, Undiscounted	$ 144		$ 142