REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 8,473	$ 7,797	$ 25,735	$ 23,737
Disaggregation of revenue, timing of recognition - percentage	100.00%	100.00%	100.00%	100.00%
Products [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 6,233	$ 5,885	$ 19,281	$ 17,933
Disaggregation of revenue, timing of recognition - percentage	74.00%	76.00%	75.00%	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	16.00%	15.00%	17.00%	15.00%
Services [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,240	$ 1,912	$ 6,454	$ 5,804
Disaggregation of revenue, timing of recognition - percentage	26.00%	24.00%	25.00%	24.00%
Services [Member] | Transferred At Point In Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	9.00%	7.00%	8.00%	8.00%
Services [Member] | Transferred Over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage	17.00%	17.00%	17.00%	16.00%
Aerospace
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,732	$ 2,662	$ 8,130	$ 8,566
Aerospace | Commercial Aviation Original Equipment [Member]
Disaggregation of Revenue [Line Items]
Net Sales	415	411	1,282	1,532
Aerospace | Commercial Aviation Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,083	779	3,008	2,825
Aerospace | Defense and Space [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,234	1,472	3,840	4,209
Honeywell Building Technologies
Disaggregation of Revenue [Line Items]
Net Sales	1,370	1,305	4,135	3,763
Honeywell Building Technologies | Products [Member]
Disaggregation of Revenue [Line Items]
Net Sales	805	745	2,432	2,145
Honeywell Building Technologies | Building Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	565	560	1,703	1,618
Performance Materials and Technologies
Disaggregation of Revenue [Line Items]
Net Sales	2,510	2,252	7,408	6,867
Performance Materials and Technologies | UOP [Member]
Disaggregation of Revenue [Line Items]
Net Sales	600	461	1,698	1,572
Performance Materials and Technologies | Process Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,160	1,135	3,422	3,379
Performance Materials and Technologies | Advanced Materials [Member]
Disaggregation of Revenue [Line Items]
Net Sales	750	656	2,288	1,916
Safety and Productivity Solutions
Disaggregation of Revenue [Line Items]
Net Sales	1,861	1,578	6,062	4,541
Safety and Productivity Solutions | Safety and Retail [Member]
Disaggregation of Revenue [Line Items]
Net Sales	525	599	1,884	1,612
Safety and Productivity Solutions | Productivity Solutions and Services [Member]
Disaggregation of Revenue [Line Items]
Net Sales	407	322	1,132	877
Safety and Productivity Solutions | Warehouse and Workflow Solutions [Member]
Disaggregation of Revenue [Line Items]
Net Sales	716	445	2,440	1,457
Safety and Productivity Solutions | Advanced Sensing Technologies (formerly Sensing & Internet-of-Things)
Disaggregation of Revenue [Line Items]
Net Sales	$ 213	$ 212	$ 606	$ 595