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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
USD ($)
Years
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
2017   $ 179    
2018   129    
2019   92    
2020   64    
2021   44    
Thereafter   153    
Minimum lease payments   661    
Operating leases, rent expense   216 $ 224 $ 242
Purchase obligation   111    
Purchase obligation in 2017   66    
Purchase obligation in 2018 through 2019   $ 21    
Agreement to outsource billing and collection function 10 years      
Remaining terms of lease obligations, maximum | Years   31    
Litigation reserves   $ 5 9  
Self-insurance reserves   117 $ 124  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 68