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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
2018   $ 177    
2019   139    
2020   99    
2021   69    
2022   48    
Thereafter   127    
Minimum lease payments   659    
Operating leases, rent expense   219 $ 216 $ 224
Purchase obligation   99    
Purchase obligation in 2018   53    
Purchase obligation in 2019 through 2020   $ 21    
Agreement to outsource billing and collection function 10 years      
Remaining terms of lease obligations, maximum   30 years    
Litigation reserves   $ 2 5  
Self-insurance reserves   118 $ 117  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 71