GOODWILL AND OTHER INTANGIBLE ASSETS - NET (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Future Amortization Expense - 2021	$ 335,000,000
Future Amortization Expense - 2022	311,000,000
Future Amortization Expense - 2023	272,000,000
Future Amortization Expense - 2024	250,000,000
Future Amortization Expense - 2025	239,000,000
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,673,000,000	$ 6,443,000,000
Accumulated Amortization	(4,159,000,000)	(3,737,000,000)
Net Carrying Amount	2,514,000,000	2,706,000,000
Goodwill [Line Items]
Balance at beginning of period,	15,563,000,000
Acquisitions/Divestitures	167,000,000
Currency Translation Adjustment	328,000,000
Balance at end of period,	16,058,000,000	15,563,000,000
Finite And Indefinite Other Intangible Assets [Abstract]
Trademarks with indefinite lives	1,046,000,000	1,028,000,000
Gross carrying amount	7,719,000,000	7,471,000,000
Accumulated Amortization	(4,159,000,000)	(3,737,000,000)
Net carrying amount	3,560,000,000	3,734,000,000
Goodwill and Intangible Assets Paragraph Details [Abstract]
Amortization of Intangible Assets	358,000,000	415,000,000	$ 395,000,000
Aerospace [Member]
Goodwill [Line Items]
Balance at beginning of period,	2,266,000,000
Acquisitions/Divestitures	105,000,000
Currency Translation Adjustment	7,000,000
Balance at end of period,	2,378,000,000	2,266,000,000
Performance Materials And Technologies [Member]
Goodwill [Line Items]
Balance at beginning of period,	5,105,000,000
Acquisitions/Divestitures	0
Currency Translation Adjustment	150,000,000
Balance at end of period,	5,255,000,000	5,105,000,000
Honeywell Building Technologies [Member]
Goodwill [Line Items]
Balance at beginning of period,	3,215,000,000
Acquisitions/Divestitures	62,000,000
Currency Translation Adjustment	108,000,000
Balance at end of period,	3,385,000,000	3,215,000,000
Safety And Productivity Solutions [Member]
Goodwill [Line Items]
Balance at beginning of period,	4,977,000,000
Acquisitions/Divestitures	0
Currency Translation Adjustment	63,000,000
Balance at end of period,	5,040,000,000	4,977,000,000
Patents and Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,159,000,000	2,060,000,000
Accumulated Amortization	(1,595,000,000)	(1,481,000,000)
Net Carrying Amount	564,000,000	579,000,000
Finite And Indefinite Other Intangible Assets [Abstract]
Accumulated Amortization	(1,595,000,000)	(1,481,000,000)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,889,000,000	3,769,000,000
Accumulated Amortization	(2,050,000,000)	(1,766,000,000)
Net Carrying Amount	1,839,000,000	2,003,000,000
Finite And Indefinite Other Intangible Assets [Abstract]
Accumulated Amortization	(2,050,000,000)	(1,766,000,000)
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	327,000,000	317,000,000
Accumulated Amortization	(247,000,000)	(228,000,000)
Net Carrying Amount	80,000,000	89,000,000
Finite And Indefinite Other Intangible Assets [Abstract]
Accumulated Amortization	(247,000,000)	(228,000,000)
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	298,000,000	297,000,000
Accumulated Amortization	(267,000,000)	(262,000,000)
Net Carrying Amount	31,000,000	35,000,000
Finite And Indefinite Other Intangible Assets [Abstract]
Accumulated Amortization	$ (267,000,000)	$ (262,000,000)