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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 30, 2015
Jun. 30, 2015
Feb. 29, 2016
Dec. 31, 2015
Debt Instruments [Abstract]        
Debt instrument issued   $ 1,500,000,000    
Net proceeds from issuance of long-term debt   $ 1,480,000,000   $ 1,478,000,000
Republic of Ecuador | International Center for the Settlement of Investment Disputes        
Litigation Settlement        
Pre-tax gain on settlement       $ 322,000,000
Award amount $ 1,000,000,000      
Subsequent event | Republic of Ecuador | International Center for the Settlement of Investment Disputes        
Litigation Settlement        
Proceeds from award     $ 322,000,000  
3.50% senior unsecured notes due 2025        
Debt Instruments [Abstract]        
Debt instrument interest rate stated percentage   3.50%    
Debt instrument issued   $ 750,000,000    
4.625% senior unsecured notes due 2045        
Debt Instruments [Abstract]        
Debt instrument interest rate stated percentage   4.625%   4.625%
Debt instrument issued   $ 750,000,000