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COMMITMENTS AND CONTINGENCIES (Details)
1 Months Ended 7 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2019
USD ($)
claim
Dec. 31, 2019
USD ($)
Oct. 25, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Purchase obligation   $ 210,000,000 $ 210,000,000      
Purchase obligation in 2020   83,000,000 83,000,000      
Purchase obligation in 2021 through 2022   91,000,000 $ 91,000,000      
Agreement to outsource billing and collection function 10 years          
Remaining terms of lease obligations, maximum     28 years      
Litigation reserves   1,000,000 $ 1,000,000   $ 1,000,000  
Self-insurance reserves   $ 132,000,000 132,000,000   $ 125,000,000  
AMAC Data Security Incident            
Debt Instrument [Line Items]            
New claims filed (in lawsuits) | claim   39        
Letter of Credit            
Debt Instrument [Line Items]            
Letters of credit outstanding, amount   $ 71,000,000 71,000,000      
Secured Receivables Credit Facility (3.39% at December 31, 2018)            
Debt Instrument [Line Items]            
Credit facility capacity       $ 600,000,000    
Secured Receivables Credit Facility (3.39% at December 31, 2018) | Letter of Credit            
Debt Instrument [Line Items]            
Credit facility capacity   100,000,000 100,000,000      
Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility capacity           $ 750,000,000
Revolving Credit Facility | Letter of Credit            
Debt Instrument [Line Items]            
Credit facility capacity   $ 150,000,000 $ 150,000,000