Guarantees (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Product Warranty Liability [Line Items]
Balance as of January 1	$ 1,057	$ 1,033
Warranties and performance guarantees issued	247	206
Settlements made	(212)	(229)
Other	(3)	(10)
Balance as of September 30	1,089	$ 1,000
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	114		120
Third Party Guarantees
Product Warranty Liability [Line Items]
Maximum Potential Payment	376		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