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LONG-TERM DEBT - CREDIT FACILITY (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
2014 Credit Facility      
LONG-TERM DEBT      
Credit Facility, maximum borrowing capacity   $ 2,000  
Amount drawn   $ 0  
Average annual facility fee as percent of the total commitment amounts   0.08%  
2018 Credit Facility      
LONG-TERM DEBT      
Credit facility term 5 years    
Credit Facility, maximum borrowing capacity $ 3,000    
Dolphin Energy      
LONG-TERM DEBT      
Notional amount of limited recourse guarantees with respect to Dolphin Energy's debt   $ 272 $ 296