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BUSINESS ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLE ASSETS - Finite and Indefinite-lived Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 2,418 $ 2,462
Accumulated Amortization (1,901) (1,913)
Indefinite-lived Intangible Assets [Line Items]    
Total intangible assets, gross (excluding goodwill) 2,915 2,996
Trademarks and other    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets (excluding goodwill) 497 534
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 1,448 1,479
Accumulated Amortization (1,142) (1,154)
Patents and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 284 287
Accumulated Amortization (201) (201)
Monitoring lines    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 62 67
Accumulated Amortization (49) (52)
Service portfolios and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 624 629
Accumulated Amortization $ (509) $ (506)