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REDEEMABLE NONCONTROLLING INTERESTS IN EQUITY OF CONSOLIDATED SUBSIDIARIES - Ownership percentage (Details) - United Surgical Partners International - USD ($)
$ in Millions
 1 Months Ended
Jun. 16, 2015
Apr. 30, 2016
Jan. 31, 2016
REDEEMABLE NONCONTROLLING INTEREST      
Payment made to purchase shares in joint venture $ 424    
Redeemable noncontrolling interests      
REDEEMABLE NONCONTROLLING INTEREST      
Payment made to purchase shares in joint venture   $ 127  
Joint venture ownership percentage   56.30%  
Redeemable noncontrolling interests | Put Option | Minimum      
REDEEMABLE NONCONTROLLING INTEREST      
Equity necessary for joint venture (as a percent)     12.50%
Redeemable noncontrolling interests | Put Option | Maximum      
REDEEMABLE NONCONTROLLING INTEREST      
Equity necessary for joint venture (as a percent)     25.00%