Contingent Liabilities (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2021 EUR (€)
Loss Contingencies [Line Items]
Income Tax Expense (Benefit)	$ 541		$ 455	$ 594
Gross interest expense related to unrecognized tax benefits	2		10	8
Total accrued interest balance at December 31	152		153	$ 141
Environmental Regulation
Loss Contingencies [Line Items]
Loss Contingency Accrual	12		12
German Tax Office Against Otis
Loss Contingencies [Line Items]
Income Tax Expense (Benefit)	243	€ 215
Disallowed tax benefit, estimated interest expense	134	€ 118
Gross interest expense related to unrecognized tax benefits					$ 300	€ 275
Total accrued interest balance at December 31	50						€ 45
Asbestos Matter
Loss Contingencies [Line Items]
Insurance recovery receivable	5		5
Asbestos Matter | Minimum
Loss Contingencies [Line Items]
Estimate of possible loss	22		23
Asbestos Matter | Maximum
Loss Contingencies [Line Items]
Estimate of possible loss	$ 45		$ 45