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COMMITMENTS AND CONTINGENCIES (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2020
USD ($)
claim
Oct. 22, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Purchase obligation   $ 334,000,000    
Purchase obligation in 2020   106,000,000    
Purchase obligation in 2021 through 2022   $ 103,000,000    
Agreement to outsource billing and collection function 10 years      
Remaining terms of lease obligations, maximum   27 years    
New claims filed (in lawsuits) | claim   2    
Litigation reserves   $ 1,000,000   $ 1,000,000
Self-insurance reserves   138,000,000   $ 132,000,000
Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 70,000,000    
Secured Receivables Credit Facility        
Debt Instrument [Line Items]        
Credit facility capacity     $ 600,000,000  
Secured Receivables Credit Facility | Letter of Credit        
Debt Instrument [Line Items]        
Credit facility capacity     $ 100,000,000