EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to Honeywell	$ 1,359	$ 758	$ 1,081	$ 1,581	$ 1,562	$ 1,624	$ 1,541	$ 1,416	$ 4,779	$ 6,143	$ 6,765
Weighted average shares outstanding									704.1	721.0	743.0
Earnings per share of common stock - basic	$ 1.94	$ 1.08	$ 1.54	$ 2.23	$ 2.19	$ 2.26	$ 2.13	$ 1.94	$ 6.79	$ 8.52	$ 9.10
Earnings Per Share, Diluted [Abstract]
Net income attributable to Honeywell	$ 1,359	$ 758	$ 1,081	$ 1,581	$ 1,562	$ 1,624	$ 1,541	$ 1,416	$ 4,779	$ 6,143	$ 6,765
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average shares outstanding									704.1	721.0	743.0
Dilutive securities issuable - stock plans									7.1	9.3	10.0
Total weighted average diluted shares outstanding									711.2	730.3	753.0
Earnings per share of common stock - assuming dilution	$ 1.91	$ 1.07	$ 1.53	$ 2.21	$ 2.16	$ 2.23	$ 2.10	$ 1.92	$ 6.72	$ 8.41	$ 8.98
Earnings Per Share Paragraph Details [Abstract]
Stock options excluded from diluted computations									5.5	2.5	2.5