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DERIVATIVES (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Gross fair value of derivative assets and liabilities outstanding    
Less: counterparty netting and cash collateral, asset $ (755) $ (680)
Less: counterparty netting and cash collateral, liability (779) (736)
Total net fair value, asset 195 295
Total net fair value, liability 184 381
Payables in respect of collateral received netted with derivative assets 39 39
Receivables in respect of collateral paid netted with derivative liabilities 63 95
Collateral deposited with clearing houses and brokers 173 154
Credit risk contingent features    
Net derivative liabilities with credit-risk-related contingent features 58 234
Amount of collateral posted 27 10
Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 950 975
Commodity contract derivative liability, gross 963 1,117
Cash-flow hedges | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 44 60
Commodity contract derivative liability, gross 5 209
Cash-flow hedges | Commodity Contracts | Marketing and trading assets and other
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 41 51
Cash-flow hedges | Commodity Contracts | Long-term receivables and other assets, net
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 3 9
Cash-flow hedges | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 5 209
Not designated as hedging instruments | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 906 915
Commodity contract derivative liability, gross 958 908
Not designated as hedging instruments | Commodity Contracts | Marketing and trading assets and other
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 835 829
Not designated as hedging instruments | Commodity Contracts | Long-term receivables and other assets, net
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 71 86
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 887 823
Not designated as hedging instruments | Commodity Contracts | Deferred credits and other liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross $ 71 $ 85