REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 8,808	$ 7,477	$ 17,262	$ 15,940
Disaggregation of revenue, timing of recognition - percentage	100.00%	100.00%	100.00%	100.00%
Products [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 6,639	$ 5,743	$ 13,048	$ 12,048
Disaggregation of revenue, timing of recognition - percentage	75.00%	77.00%	76.00%	76.00%
Products [Member] | Transferred At Point In Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	58.00%	61.00%	58.00%	61.00%
Products [Member] | Transferred Over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	17.00%	16.00%	18.00%	15.00%
Services [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,169	$ 1,734	$ 4,214	$ 3,892
Disaggregation of revenue, timing of recognition - percentage	25.00%	23.00%	24.00%	24.00%
Services [Member] | Transferred At Point In Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	7.00%	7.00%	7.00%	8.00%
Services [Member] | Transferred Over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	18.00%	16.00%	17.00%	16.00%
Aerospace
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,766	$ 2,543	$ 5,398	$ 5,904
Aerospace | Commercial Aviation Original Equipment [Member]
Disaggregation of Revenue [Line Items]
Net Sales	436	446	867	1,121
Aerospace | Commercial Aviation Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,015	661	1,925	2,046
Aerospace | Defense and Space [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,315	1,436	2,606	2,737
Honeywell Building Technologies
Disaggregation of Revenue [Line Items]
Net Sales	1,407	1,177	2,765	2,458
Honeywell Building Technologies | Products [Member]
Disaggregation of Revenue [Line Items]
Net Sales	830	659	1,628	1,400
Honeywell Building Technologies | Building Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	577	518	1,137	1,058
Performance Materials and Technologies
Disaggregation of Revenue [Line Items]
Net Sales	2,552	2,218	4,898	4,615
Performance Materials and Technologies | UOP [Member]
Disaggregation of Revenue [Line Items]
Net Sales	571	517	1,098	1,111
Performance Materials and Technologies | Process Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,166	1,093	2,262	2,244
Performance Materials and Technologies | Advanced Materials [Member]
Disaggregation of Revenue [Line Items]
Net Sales	815	608	1,538	1,260
Safety and Productivity Solutions
Disaggregation of Revenue [Line Items]
Net Sales	2,083	1,539	4,201	2,963
Safety and Productivity Solutions | Safety and Retail [Member]
Disaggregation of Revenue [Line Items]
Net Sales	616	511	1,359	1,013
Safety and Productivity Solutions | Productivity Solutions and Services [Member]
Disaggregation of Revenue [Line Items]
Net Sales	383	268	726	555
Safety and Productivity Solutions | Warehouse and Workflow Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	880	554	1,724	1,012
Safety and Productivity Solutions | Advanced Sensing Technologies (formerly Sensing & Internet-of-Things)
Disaggregation of Revenue [Line Items]
Net Sales	$ 204	$ 206	$ 392	$ 383