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Contingent Liabilities (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2019
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Sep. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]                  
Income tax expense $ 103 $ 143 $ 337   $ 411        
Environmental Regulation                  
Loss Contingencies [Line Items]                  
Loss Contingency Accrual 12   12           $ 12
German Tax Office Against Otis                  
Loss Contingencies [Line Items]                  
Income tax expense     251 € 215          
Disallowed tax benefit, estimated interest expense     138 € 118          
Unrecognized tax benefits, interest on income taxes expense           $ 300 € 275    
Unrecognized tax benefits, interest on income taxes accrued 52   52         € 45  
Asbestos Matter                  
Loss Contingencies [Line Items]                  
Insurance recovery receivable 5   5           5
Asbestos Matter | Maximum                  
Loss Contingencies [Line Items]                  
Estimate of possible loss 45   45           45
Asbestos Matter | Minimum                  
Loss Contingencies [Line Items]                  
Estimate of possible loss $ 24   $ 24           $ 24