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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
2019   $ 181    
2020   143    
2021   106    
2022   79    
2023   60    
Thereafter   122    
Minimum lease payments   691    
Operating leases, rent expense   220 $ 219 $ 216
Purchase obligation   157    
Purchase obligation in 2018   68    
Purchase obligation in 2019 through 2020   $ 66    
Agreement to outsource billing and collection function 10 years      
Remaining terms of lease obligations, maximum   29 years    
Litigation reserves   $ 1 2  
Self-insurance reserves   125 $ 118  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 71