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INTANGIBLE ASSETS AND GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2020
OTHER INTANGIBLE ASSETS AND GOODWILL [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  As of December 31, 2020As of December 31, 2019
 Remaining Weighted Average Useful Life (in years)Gross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Waste, service and energy contracts
18$447 $227 $220 $447 $211 $236 
Customer relationships, permits and other
553 36 17 52 30 22 
Intangible assets, net
$500 $263 $237 $499 $241 $258 
Waste and service contracts (liability)
16$(67)$(62)$(5)$(72)$(66)$(6)
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
The following table details the amount of amortization expense and contra-expense associated with our intangible assets and liabilities that was included in our consolidated statements of operations for each of the years indicated (in millions):
Year Ended December 31,
202020192018
Intangible assets$21 $22 $20 
Waste and service contracts (contra-expense) $(1)$(2)$(2)
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The following table details the amount of estimated amortization expense associated with our intangible assets and liabilities expected to be included in our consolidated statements of operations for each of the years indicated as of December 31, 2020 (in millions):
Year Ended December 31,
20212022202320242025
Intangible assets$20 $20 $18 $15 $15 
Schedule of Goodwill [Table Text Block]
Goodwill

The following table details the changes in carrying value of goodwill (in millions):
 Total
Balance at December 31, 2018$321 
Goodwill related to acquisitions— 
Balance at December 31, 2019321 
Impairment charges (1)
(19)
Balance at December 31, 2020$302 
(1)For additional information, see Note 1. Organization and Summary of Significant Accounting Policies - Goodwill and Note 8. Supplementary Information - Impairment Charges.