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ACQUISITIONS AND DISPOSITIONS (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 12, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired   $ (2,000,000) $ 4,000,000  
Dublin EfW Facility        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Equity method investment, percent       50.00%
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates $ 167,000,000      
Proceeds from Divestiture of Interest in Consolidated Subsidiaries, Net of Cash $ 98,000,000      
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount       $ 204,000,000
Equity Method Investments   $ 146,000,000   149,000,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity       $ 0
Green Investment Group Limited | Dublin EfW Facility        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Equity method investment, percent       50.00%