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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value - Other Financial Instruments        
Debt carrying value $ 8,357   $ 8,357 $ 6,857
Carrying value of debt, net of unamortized discount 8,400   8,400  
Chemical        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges       149
Non Cash Asset Impairment loss     121  
Midstream        
Fair Value - Other Financial Instruments        
Asset impairment and related items 814      
Non Cash Asset Impairment loss     841  
Williston proved oil and gas assets        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss   $ 763    
Piceance basin        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     460  
Proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss     1,030  
Proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss     4,693  
Impaired proved oil and gas assets - South Texas        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     554  
Impaired proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     4,700  
Oman        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     1,800  
Iraq and Libya        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     1,300  
Qatar        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     1,000  
Colombia and Bolivia        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     550  
Discontinued Operations, Disposed of by Sale | Williston proved oil and gas assets        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     $ 763  
Low end of range        
Fair Value - Other Financial Instruments        
Risk adjusted discount rate     8.00%  
High end of range        
Fair Value - Other Financial Instruments        
Risk adjusted discount rate     20.00%  
Level 3 | Chemical        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets 3   $ 3  
Level 3 | Midstream        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets 50   50  
Level 3 | Williston proved oil and gas assets        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets   615    
Level 3 | Proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets 625   625  
Level 3 | Proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets 2,666   2,666  
Level 3 | Impaired proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets       2,249
Level 3 | Impaired proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets       45
Level 3 | Property, plant, and equipment | Chemical        
Fair Value - Other Financial Instruments        
Carrying value of impaired assets       18
Net Book Value | Chemical        
Fair Value - Other Financial Instruments        
Net book value of impaired assets 124   124  
Net Book Value | Midstream        
Fair Value - Other Financial Instruments        
Net book value of impaired assets 891   891  
Net Book Value | Williston proved oil and gas assets        
Fair Value - Other Financial Instruments        
Net book value of impaired assets   $ 1,378    
Net Book Value | Proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Net book value of impaired assets 1,655   1,655  
Net Book Value | Proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Net book value of impaired assets 7,359   7,359  
Net Book Value | Impaired proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Net book value of impaired assets       5,008
Net Book Value | Impaired proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Net book value of impaired assets       1,084
Net Book Value | Property, plant, and equipment | Chemical        
Fair Value - Other Financial Instruments        
Net book value of impaired assets       129
Netting and Collateral        
Assets:        
Commodity derivatives       (742)
Netting and Collateral | Impaired proved oil and gas assets - domestic        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss       2,759
Netting and Collateral | Impaired proved oil and gas assets - international        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss       1,039
Netting and Collateral | Property, plant, and equipment | Chemical        
Fair Value - Other Financial Instruments        
Non Cash Asset Impairment loss       111
Recurring | Level 1        
Assets:        
Commodity derivatives 557   557 712
Available for sale investment 167   167 394
Liabilities:        
Commodity derivatives 544   544 750
Recurring | Level 2        
Assets:        
Commodity derivatives 87   87 127
Liabilities:        
Commodity derivatives 404   404 246
Recurring | Netting and Collateral        
Assets:        
Commodity derivatives (535)   (535)  
Liabilities:        
Commodity derivatives (525)   (525) (756)
Recurring | Total Fair Value        
Assets:        
Commodity derivatives 109   109 97
Available for sale investment 167   167 394
Liabilities:        
Commodity derivatives $ 423   423 $ 240
Non recurring | Domestic and international proved and unproved oil and gas properties member        
Fair Value - Other Financial Instruments        
Pre-tax impairment charges     $ 6,500