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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 07, 2025
Dec. 31, 2021
Income Tax Contingency [Line Items]          
Undistributed Earnings of Foreign Subsidiaries $ 23,000        
Tax audit settlements 275        
U.S. research and development credit 188 $ 168 $ 164    
Foreign Derived Intangible Income (FDII) (126) (142) (214)    
Deferred income tax benefit (47) (402) (1,663)    
Effective Income Tax Rate Reconciliation, Disposition of Business, Total Tax Expense Amount 224        
Tax charge related to taxes owed from favorable Otis non-US tax ruling in pre-separation years 212        
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount 56        
Pre-tax benefit indemnity owed by Otis pursuant to tax matters agreement 212        
Pre-tax charge related to indemnified amounts from Carrier and Otis per tax matters agreement 32        
U.S. federal audit settlements and statute lapse (277) (59) 0    
Effective Income Tax Reconciliation, Reorganization, Amount     207    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,254        
Unrecognized Tax Benefits 1,263 $ 1,442 $ 1,515   $ 1,458
Forecast [Member]          
Income Tax Contingency [Line Items]          
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority       $ 230  
Legal Entity Reorganization          
Income Tax Contingency [Line Items]          
Deferred income tax benefit (138)        
Minimum          
Income Tax Contingency [Line Items]          
Decrease in Unrecognized Tax Benefits is Reasonably Possible 200        
Minimum | Forecast [Member]          
Income Tax Contingency [Line Items]          
Estimated Net Income Charge from Unfavorable Tax Decision from the Kingdom of Saudi Arabia       30  
Maximum          
Income Tax Contingency [Line Items]          
Increase in Unrecognized Tax Benefits is Reasonably Possible $ 25        
Maximum | Forecast [Member]          
Income Tax Contingency [Line Items]          
Estimated Net Income Charge from Unfavorable Tax Decision from the Kingdom of Saudi Arabia       $ 50