v3.26.1
DEBT AND CREDIT AGREEMENTS - Narrative (Details)
€ in Millions
1 Months Ended 3 Months Ended
Apr. 10, 2026
EUR (€)
Mar. 06, 2026
USD ($)
Mar. 17, 2025
USD ($)
Mar. 18, 2024
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Jun. 29, 2026
USD ($)
Jun. 28, 2026
USD ($)
Mar. 24, 2026
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]                      
Commercial paper and other short-term borrowings         $ 4,630,000,000 $ 4,630,000,000         $ 5,893,000,000
Short-term debt, weighted average interest rate, at point in time         3.71% 3.71%         3.68%
Loss on debt extinguishment           $ (239,000,000) $ 0        
Debt restructuring costs           44,000,000 $ 0        
Senior Notes                      
Debt Instrument [Line Items]                      
Principal Amount                   $ 7,500,000,000  
Senior Notes | Honeywell Aerospace Inc                      
Debt Instrument [Line Items]                      
Principal Amount         $ 16,000,000,000.0 16,000,000,000.0          
Term Loan Agreement | Line of Credit                      
Debt Instrument [Line Items]                      
Principal Amount         6,000,000,000.0 6,000,000,000.0          
364-Day Credit Agreement | Line of Credit                      
Debt Instrument [Line Items]                      
Debt term     364 days                
Short-term debt, borrowing capacity     $ 3,000,000,000.0   3,000,000,000.0 3,000,000,000.0          
Short-term outstanding borrowings         0 0          
364-Day Credit Agreement | Line of Credit | Forecast | Spinoff | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity               $ 2,000,000,000.0      
364-Day Credit Agreement | Honeywell Aerospace Inc | Line of Credit                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity         $ 1,000,000,000.0 1,000,000,000.0          
Debt term         364 days            
5-Year Credit Agreement | Line of Credit                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity   $ 4,000,000,000.0   $ 4,000,000,000.0              
Debt term   5 years   5 years              
Long-term outstanding borrowings         $ 0 0          
5-Year Credit Agreement | Line of Credit | Forecast | Spinoff                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity               3,500,000,000 $ 4,500,000,000    
5-Year Credit Agreement | Line of Credit | Forecast | Spinoff | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity               $ 3,000,000,000.0      
5-Year Credit Agreement | Line of Credit | Honeywell Aerospace Inc                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity         $ 3,000,000,000.0 $ 3,000,000,000.0          
Debt term         5 years            
Notes 4.37% Due 2027                      
Debt Instrument [Line Items]                      
Principal Amount         $ 1,000,000,000.0            
Debt instrument, interest rate, stated percentage         4.37% 4.37%          
3.50% euro notes due 2027 | Subsequent Event                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate, stated percentage 3.50%                    
3.50% euro notes due 2027 | Senior Notes                      
Debt Instrument [Line Items]                      
Principal Amount                   $ 529,000,000  
Debt instrument, interest rate, stated percentage         3.50% 3.50%       3.50%  
2.25% euro notes due 2028 | Subsequent Event                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate, stated percentage 2.25%                    
Repayments of senior debt | € € 566                    
2.25% euro notes due 2028 | Senior Notes                      
Debt Instrument [Line Items]                      
Principal Amount                   $ 528,000,000  
Debt instrument, interest rate, stated percentage         2.25% 2.25%       2.25%