BUSINESS ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLE ASSETS - Finite and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 2,456	$ 2,462
Accumulated Amortization	(1,957)	(1,913)
Indefinite-lived Intangible Assets [Line Items]
Total intangible assets, gross (excluding goodwill)	2,981	2,996
Trademarks and other
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	525	534
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,474	1,479
Accumulated Amortization	(1,181)	(1,154)
Patents and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Amount	287	287
Accumulated Amortization	(206)	(201)
Monitoring lines
Finite-Lived Intangible Assets [Line Items]
Gross Amount	66	67
Accumulated Amortization	(53)	(52)
Service portfolios and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	629	629
Accumulated Amortization	$ (517)	$ (506)