EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to Honeywell	$ 1,257	$ 758	$ 4,114	$ 3,420
Weighted average shares outstanding	690,600,000	702,600,000	693,600,000	704,800,000
Earnings per share of common stock - basic (in dollars per share)	$ 1.82	$ 1.08	$ 5.93	$ 4.85
Assuming dilution
Net income attributable to Honeywell	$ 1,257	$ 758	$ 4,114	$ 3,420
Average shares
Weighted average shares outstanding	690,600,000	702,600,000	693,600,000	704,800,000
Dilutive securities issuable - stock plans	8,300,000	7,000,000.0	8,400,000	6,800,000
Total weighted average shares outstanding	698,900,000	709,600,000	702,000,000.0	711,600,000
Earnings per share of common stock - assuming dilution (in dollars per share)	$ 1.80	$ 1.07	$ 5.86	$ 4.81
Earnings Per Share Paragraph Details [Abstract]
Stock options excluded from diluted computations	1,900,000	7,100,000	1,600,000	6,400,000
Shares outstanding	688,400,000	701,700,000	688,400,000	701,700,000
Common Stock Shares Issued	957,600,000	957,600,000	957,600,000	957,600,000