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DERIVATIVES (Details 2) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Gross and net fair values of outstanding derivatives (in millions)    
Less: counterparty netting and cash collateral, asset $ (535) $ (742)
Less: counterparty netting and cash collateral, liability (525) (756)
Total net fair value, asset 109 97
Total net fair value, liability 423 240
Collateral received netted against derivative assets 14 0
Collateral paid netted against derivative liabilities 4 8
Collateral deposited with clearinghouses and brokers 3 44
Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 644 839
Commodity contract derivative liability, gross 948 996
Cash-flow hedges | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 9  
Commodity contract derivative liability, gross 1  
Cash-flow hedges | Commodity Contracts | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 1  
Not designated as hedging instruments | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 635 839
Commodity contract derivative liability, gross 947 996
Not designated as hedging instruments | Commodity Contracts | Other current assets    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 626 828
Not designated as hedging instruments | Commodity Contracts | Long-term receivables and other assets, net    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 9 11
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 672 886
Not designated as hedging instruments | Commodity Contracts | Deferred credits and other liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross $ 275 $ 110