RESTRUCTURING COSTS - Schedules (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	$ 3			$ 34	$ 19	$ 97
Cost of sales
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	(1)			14	5	27
Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	4			20	14	70
2020 Actions
Restructuring Reserve [Roll Forward]
Beginning balance	9		$ 0		0
Net pre-tax restructuring costs	5				18
Utilization, foreign exchange and other costs	(4)				(8)
Ending balance	10	$ 9			10		$ 0
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	22				22
Costs Incurred	(5)	(11)	(2)
Remaining Costs	4				4
2020 Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	8		0		0
Net pre-tax restructuring costs	5				17
Utilization, foreign exchange and other costs	(4)				(8)
Ending balance	9	8			9		0
2020 Actions | Facility Exit, Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	1		0		0
Net pre-tax restructuring costs	0				1
Utilization, foreign exchange and other costs	0				0
Ending balance	1	1			1		0
2020 Actions | Cost of sales
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs					7
2020 Actions | Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs					11
2019 Actions
Restructuring Reserve [Roll Forward]
Beginning balance	27		44		44
Net pre-tax restructuring costs	0				3	82
Utilization, foreign exchange and other costs	(5)				(25)
Ending balance	22	27			22		44
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs				120		120
Costs Incurred	0	0	(3)				(110)
Remaining Costs	7				7
2019 Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	27		43		43
Net pre-tax restructuring costs	0				3
Utilization, foreign exchange and other costs	(5)				(24)
Ending balance	22	27			22		43
2019 Actions | Facility Exit, Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0		1		1
Net pre-tax restructuring costs	0				0
Utilization, foreign exchange and other costs	0				(1)
Ending balance	0	0			0		1
2019 Actions | Cost of sales
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs					0	20
2019 Actions | Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs					3	62
Operating Segments | HVAC
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	0			12	3	47
Operating Segments | Refrigeration
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	(1)			7	2	14
Operating Segments | Fire & Security
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	4			14	13	35
Operating Segments | 2020 Actions | HVAC
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	5				5
Costs Incurred	(1)	(2)	(1)
Remaining Costs	1				1
Operating Segments | 2020 Actions | Refrigeration
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	3				3
Costs Incurred	0	(3)	0
Remaining Costs	0				0
Operating Segments | 2020 Actions | Fire & Security
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	13				13
Costs Incurred	(4)	(5)	(1)
Remaining Costs	3				3
Operating Segments | 2019 Actions | HVAC
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs				53		53
Costs Incurred	(1)	2	(1)				(51)
Remaining Costs	2				2
Operating Segments | 2019 Actions | Refrigeration
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs				16		16
Costs Incurred	1	(1)	0				(14)
Remaining Costs	2				2
Operating Segments | 2019 Actions | Fire & Security
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs				49		49
Costs Incurred	0	(1)	(2)				(43)
Remaining Costs	3				3
Eliminations and other
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	0			1	1	1
Eliminations and other | 2020 Actions
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	1				1
Costs Incurred	0	(1)	0
Remaining Costs	0				0
Eliminations and other | 2019 Actions
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs				$ 2		$ 2
Costs Incurred	0	$ 0	$ 0				$ (2)
Remaining Costs	$ 0				$ 0