SEGMENT FINANCIAL DATA (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segments	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Net Sales	$ 9,243	$ 10,919	$ 18,127	$ 21,311
Total segment profit	1,970	2,145	$ 3,779	4,140
Number of Operating Segments | segments			4
Products [Member]
Segment Reporting Information [Line Items]
Net Sales	6,990	8,703	$ 13,703	16,937
Services [Member]
Segment Reporting Information [Line Items]
Net Sales	2,253	2,216	4,424	4,374
Corporate
Segment Reporting Information [Line Items]
Total segment profit	(72)	(64)	(148)	(128)
Aerospace
Segment Reporting Information [Line Items]
Net Sales	3,508	4,058	6,849	8,035
Aerospace | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	3,508	4,058	6,849	8,035
Total segment profit	907	918	1,745	1,811
Aerospace | Operating Segments [Member] | Products [Member]
Segment Reporting Information [Line Items]
Net Sales	2,174	2,800	4,249	5,528
Aerospace | Operating Segments [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net Sales	1,334	1,258	2,600	2,507
Performance Materials and Technologies
Segment Reporting Information [Line Items]
Net Sales	2,735	2,698	5,307	5,232
Performance Materials and Technologies | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	2,735	2,698	5,307	5,232
Total segment profit	644	597	1,208	1,116
Performance Materials and Technologies | Operating Segments [Member] | Products [Member]
Segment Reporting Information [Line Items]
Net Sales	2,238	2,194	4,308	4,257
Performance Materials and Technologies | Operating Segments [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net Sales	497	504	999	975
Honeywell Building Technologies
Segment Reporting Information [Line Items]
Net Sales	1,450	2,546	2,839	4,979
Honeywell Building Technologies | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	1,450	2,546	2,839	4,979
Total segment profit	300	427	571	843
Honeywell Building Technologies | Operating Segments [Member] | Products [Member]
Segment Reporting Information [Line Items]
Net Sales	1,119	2,183	2,192	4,266
Honeywell Building Technologies | Operating Segments [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net Sales	331	363	647	713
Safety and Productivity Solutions
Segment Reporting Information [Line Items]
Net Sales	1,550	1,617	3,132	3,065
Safety and Productivity Solutions | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	1,550	1,617	3,132	3,065
Total segment profit	191	267	403	498
Safety and Productivity Solutions | Operating Segments [Member] | Products [Member]
Segment Reporting Information [Line Items]
Net Sales	1,459	1,526	2,954	2,886
Safety and Productivity Solutions | Operating Segments [Member] | Services [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 91	$ 91	$ 178	$ 179