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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income attributable to Honeywell $ 1,430 $ 1,081 $ 2,857 $ 2,662
Weighted average shares outstanding 693,800,000 702,300,000 695,000,000.0 705,900,000
Earnings per share of common stock - basic (in dollars per share) $ 2.06 $ 1.54 $ 4.11 $ 3.77
Assuming dilution        
Net income attributable to Honeywell $ 1,430 $ 1,081 $ 2,857 $ 2,662
Average shares        
Weighted average shares outstanding 693,800,000 702,300,000 695,000,000.0 705,900,000
Dilutive securities issuable - stock plans 8,700,000 5,800,000 8,500,000 6,700,000
Total weighted average shares outstanding 702,500,000 708,100,000 703,500,000 712,600,000
Earnings per share of common stock - assuming dilution (in dollars per share) $ 2.04 $ 1.53 $ 4.06 $ 3.74
Earnings Per Share Paragraph Details [Abstract]        
Stock options excluded from diluted computations 1,900,000 7,800,000 1,400,000 6,100,000
Shares outstanding 690,400,000 701,800,000 690,400,000 701,800,000
Common Stock Shares Issued 957,600,000 957,600,000 957,600,000 957,600,000