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INCOME TAXES (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income (loss) before income taxes          
Income / (loss) before income taxes     $ (5,476.0) $ (2,421.0) $ 1,447.0
Provision (benefit) for federal, state and local income taxes          
Current United States Federal tax expense (benefit)     255.0 66.0 227.0
Current State and Local tax expense (benefit)     81.0 99.0 91.0
Current Total tax expense (benefit)     336.0 165.0 318.0
Deferred United States Federal tax expense (benefit)     (1,961.0) (840.0) 222.0
Deferred State and Local tax expense (benefit)     (297.0) (312.0) 38.0
Deferred Total tax expense (benefit)     (2,258.0) (1,152.0) 260.0
United States Federal Total tax expense (benefit)     (1,706.0) (774.0) 449.0
State and Local Total tax expense (benefit)     (216.0) (213.0) 129.0
Total tax expense (benefit)     $ (1,922.0) $ (987.0) $ 578.0
Reconciliation of the United States federal statutory income tax rate to our effective tax rate on income          
United States federal statutory tax rate (as a percent)     35.00% 35.00% 35.00%
State income taxes, net of federal provision (as a percent)     5.00% 6.00% 6.00%
Valuation allowance (as a percent)     (5.00%)    
Other (as a percent)         (1.00%)
Effective tax rate (as a percent)     35.00% 41.00% 40.00%
Deferred Tax Assets and Liabilities          
Deferred Tax Assets, long-term debt $ 608.0 $ 608.0 $ 608.0    
Deferred Tax Assets, property, plant and equipment differences 132.0 132.0 132.0    
Deferred Tax Assets, postretirement benefit accruals 41.0 41.0 41.0 $ 39.0  
Deferred Tax Assets, deferred compensation and benefits 75.0 75.0 75.0 62.0  
Deferred Tax Assets, asset retirement obligations 156.0 156.0 156.0 184.0  
Deferred Tax Assets, federal benefit of state income taxes 28.0 28.0 28.0 68.0  
Deferred Tax Assets, net operating loss carryforwards 7.0 7.0 7.0 64.0  
Deferred Tax Assets, all other 47.0 47.0 47.0 27.0  
Deferred Tax Assets, subtotal 1,094.0 1,094.0 1,094.0 444.0  
Deferred Tax Assets, valuation allowance (382.0) (382.0) (382.0)    
Deferred Tax Assets, total net deferred taxes 712.0 712.0 712.0 444.0  
Deferred Tax Liabilities, property, plant and equipment differences (427.0) (427.0) (427.0) (2,437.0)  
Deferred Tax Liabilities, federal effect of state income taxes (24.0) (24.0) (24.0)    
Deferred Tax Liabilities, all other (3.0) (3.0) (3.0) (1.0)  
Deferred Tax Liabilities, subtotal (454.0) (454.0) (454.0) (2,438.0)  
Deferred Tax Liabilities, net deferred taxes (454.0) (454.0) (454.0) (2,438.0)  
Net Operating Loss Carryforwards          
Current income tax provision     336.0 165.0 $ 318.0
Valuation Allowance net of federal benefit for state portion   294.0      
Cancellation of debt income, for tax purposes 1,390.0        
Original issue discount, for tax purposes 830.0 830.0 $ 830.0    
Amortization period of debt issue discount     7 years    
Amounts due to Occidental under tax sharing agreement     $ 0.0 0.0  
Liabilities for unrecognized tax benefits 0.0 0.0 0.0 0.0  
Interest and penalties related to uncertain tax positions     0.0 0.0 $ 0.0
US federal          
Net Operating Loss Carryforwards          
Deferred Tax Assets, net operating loss carryforwards 40.0 40.0 40.0    
State and Local Jurisdiction          
Net Operating Loss Carryforwards          
Deferred Tax Assets, net operating loss carryforwards 106.0 106.0 106.0    
Other current assets          
Deferred Tax Assets and Liabilities          
Net Deferred Tax Assets, Current $ 59.0 $ 59.0 59.0 $ 61.0  
Other long-term liabilities          
Provision (benefit) for federal, state and local income taxes          
Current provision reported in other long-term liabilities     $ 310.0