RESTRUCTURING COSTS - Schedules (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	$ 11		$ 30	$ 16	$ 63
Cost of sales
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	5		8	6	13
Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	6		22	10	50
2020 Actions
Restructuring Reserve [Roll Forward]
Beginning balance	2	$ 0		0
Net pre-tax restructuring costs	11			13
Utilization, foreign exchange and other costs	(4)			(4)
Ending balance	9	2		9		$ 0
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	20			20
Costs Incurred	(11)	(2)
Remaining Costs	7			7
2020 Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	2	0		0
Net pre-tax restructuring costs	10			12
Utilization, foreign exchange and other costs	(4)			(4)
Ending balance	8	2		8		0
2020 Actions | Facility Exit, Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0		0
Net pre-tax restructuring costs	1			1
Utilization, foreign exchange and other costs	0			0
Ending balance	1	0		1		0
2020 Actions | Cost of sales
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs				5
2020 Actions | Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs				8
2019 Actions
Restructuring Reserve [Roll Forward]
Beginning balance	32	44		44
Net pre-tax restructuring costs	0			3	49
Utilization, foreign exchange and other costs	(5)			(20)
Ending balance	27	32		27		44
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs			120		120
Costs Incurred	0	(3)				(110)
Remaining Costs	7			7
2019 Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	32	43		43
Net pre-tax restructuring costs	0			3
Utilization, foreign exchange and other costs	(5)			(19)
Ending balance	27	32		27		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				1	8
2019 Actions | Selling, general and administrative
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs				2	41
Operating Segments | HVAC
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	1		18	3	35
Operating Segments | Refrigeration
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	3		4	3	7
Operating Segments | Fire & Security
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	6		8	9	21
Operating Segments | 2020 Actions | HVAC
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	5			5
Costs Incurred	(2)	(1)
Remaining Costs	2			2
Operating Segments | 2020 Actions | Refrigeration
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	5			5
Costs Incurred	(3)	0
Remaining Costs	2			2
Operating Segments | 2020 Actions | Fire & Security
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	8			8
Costs Incurred	(5)	(1)
Remaining Costs	2			2
Operating Segments | 2019 Actions | HVAC
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs			53		53
Costs Incurred	2	(1)				(51)
Remaining Costs	3			3
Operating Segments | 2019 Actions | Refrigeration
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs			16		16
Costs Incurred	(1)	0				(14)
Remaining Costs	1			1
Operating Segments | 2019 Actions | Fire & Security
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs			49		49
Costs Incurred	(1)	(2)				(43)
Remaining Costs	3			3
Eliminations and other
Restructuring Reserve [Roll Forward]
Net pre-tax restructuring costs	1		0	1	0
Eliminations and other | 2020 Actions
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs	2			2
Costs Incurred	(1)	0
Remaining Costs	1			1
Eliminations and other | 2019 Actions
Restructuring and Related Cost, Expected Cost [Abstract]
Expected Costs			$ 2		$ 2
Costs Incurred	0	$ 0				$ (2)
Remaining Costs	$ 0			$ 0