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COMMITMENTS AND CONTINGENCIES (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
claim
Oct. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Purchase obligation   $ 252,000,000    
Purchase obligation, 2022   53,000,000    
Purchase obligation, 2023 through 2024   $ 87,000,000    
Agreement to outsource billing and collection function 10 years      
Remaining terms of lease obligations, maximum   26 years    
New claims filed (in lawsuits) | claim     2  
Litigation reserves   $ 4,000,000 $ 1,000,000  
Self-insurance reserves   159,000,000 $ 138,000,000  
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