REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Details) - USD ($)	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
Disaggregation of Revenue [Line Items]
Revenue	$ 8,900,000,000	$ 7,797,000,000	$ 7,477,000,000	$ 8,463,000,000	$ 9,496,000,000	$ 9,086,000,000	$ 9,243,000,000	$ 8,884,000,000	$ 32,637,000,000	$ 36,709,000,000	$ 41,802,000,000
Disaggregation of revenue, timing of recognition - percentage									100.00%	100.00%	100.00%
Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 24,737,000,000	$ 27,629,000,000	$ 32,848,000,000
Disaggregation of revenue, timing of recognition - percentage									76.00%	75.00%	79.00%
Products [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									61.00%	61.00%	67.00%
Products [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									15.00%	14.00%	12.00%
Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 7,900,000,000	$ 9,080,000,000	$ 8,954,000,000
Disaggregation of revenue, timing of recognition - percentage									24.00%	25.00%	21.00%
Services [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									8.00%	9.00%	7.00%
Services [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									16.00%	16.00%	14.00%
Aerospace [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 11,544,000,000	$ 14,054,000,000	$ 15,493,000,000
Aerospace [Member] | Commercial Aviation Original Equipment [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,932,000,000	2,997,000,000	2,833,000,000
Aerospace [Member] | Commercial Aviation Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue									3,786,000,000	5,731,000,000	5,373,000,000
Aerospace [Member] | Defense and Space [Member]
Disaggregation of Revenue [Line Items]
Revenue									5,826,000,000	5,326,000,000	4,665,000,000
Aerospace [Member] | Transportation Systems [Member]
Disaggregation of Revenue [Line Items]
Revenue									0	0	2,622,000,000
Aerospace [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									7,194,000,000	8,766,000,000	10,415,000,000
Aerospace [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									4,350,000,000	5,288,000,000	5,078,000,000
Honeywell Building Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue									5,189,000,000	5,717,000,000	9,298,000,000
Honeywell Building Technologies [Member] | Homes Products And Software [Member]
Disaggregation of Revenue [Line Items]
Revenue									0	0	1,732,000,000
Honeywell Building Technologies [Member] | Distribution (ADI) [Member]
Disaggregation of Revenue [Line Items]
Revenue									0	0	2,196,000,000
Honeywell Building Technologies [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,995,000,000	3,314,000,000	2,953,000,000
Honeywell Building Technologies [Member] | Building Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,194,000,000	2,403,000,000	2,417,000,000
Honeywell Building Technologies [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									3,868,000,000	4,395,000,000	7,868,000,000
Honeywell Building Technologies [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,321,000,000	1,322,000,000	1,430,000,000
Performance Materials And Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue									9,423,000,000	10,834,000,000	10,674,000,000
Performance Materials And Technologies [Member] | UOP [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,177,000,000	2,890,000,000	2,845,000,000
Performance Materials And Technologies [Member] | Process Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue									4,590,000,000	5,146,000,000	4,981,000,000
Performance Materials And Technologies [Member] | Specialty Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,075,000,000	1,062,000,000	1,134,000,000
Performance Materials And Technologies [Member] | Fluorine Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,581,000,000	1,736,000,000	1,714,000,000
Performance Materials And Technologies [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									7,548,000,000	8,732,000,000	8,589,000,000
Performance Materials And Technologies [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,875,000,000	2,102,000,000	2,085,000,000
Safety And Productivity Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue									6,481,000,000	6,104,000,000	6,337,000,000
Safety And Productivity Solutions [Member] | Safety and Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,414,000,000	2,215,000,000	2,278,000,000
Safety And Productivity Solutions [Member] | Productivity Solutions and Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									1,256,000,000	1,270,000,000	1,540,000,000
Safety And Productivity Solutions [Member] | Warehouse and Workflow Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue									2,018,000,000	1,771,000,000	1,662,000,000
Safety And Productivity Solutions [Member] | Sensing & Internet-of-Things (IoT)
Disaggregation of Revenue [Line Items]
Revenue									793,000,000	848,000,000	857,000,000
Safety And Productivity Solutions [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Revenue									6,127,000,000	5,736,000,000	5,976,000,000
Safety And Productivity Solutions [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 354,000,000	$ 368,000,000	$ 361,000,000