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Derivatives (Details 4) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Gross fair value of derivative assets and liabilities outstanding    
Less: counterparty netting and cash collateral, asset $ (432) $ (758)
Less: counterparty netting and cash collateral, liability (515) (782)
Total net fair value, asset 157 192
Total net fair value, liability 141 181
Payables in respect of collateral received netted with derivative assets 17 42
Receivables in respect of collateral paid netted with derivative liabilities 100 66
Collateral deposited with clearinghouses and brokers 131 173
Credit risk contingent features    
Net derivative liabilities with credit-risk-related contingent features 25 58
Amount of collateral posted 59 27
Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 589 950
Commodity contract derivative liability, gross 656 963
Cash-flow hedges | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 3 44
Commodity contract derivative liability, gross 3 5
Cash-flow hedges | Commodity Contracts | Marketing and trading assets and other
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 3 41
Cash-flow hedges | Commodity Contracts | Long-term receivables and other assets, net
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross   3
Cash-flow hedges | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 3 5
Not designated as hedging instruments | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 586 906
Commodity contract derivative liability, gross 653 958
Not designated as hedging instruments | Commodity Contracts | Marketing and trading assets and other
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 556 835
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 derivative asset, gross 30 71
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 626 887
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 $ 27 $ 71