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Derivatives (Details 4) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Gross fair value of derivative assets and liabilities outstanding    
Less: counterparty netting and cash collateral, asset $ (1,234) $ (758)
Less: counterparty netting and cash collateral, liability (1,331) (782)
Total net fair value, asset 240 192
Total net fair value, liability 189 181
Payables in respect of collateral received netted with derivative assets 42 42
Receivables in respect of collateral paid netted with derivative liabilities 139 66
Collateral deposited with clearing houses and brokers 175 173
Credit risk contingent features    
Net derivative liabilities with credit-risk-related contingent features 22 58
Amount of collateral posted 76 27
Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 1,474 950
Commodity contract derivative liability, gross 1,520 963
Cash-flow hedges | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross   44
Commodity contract derivative liability, gross   5
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 6 41
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
Cash-flow hedges | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 6 5
Not designated as hedging instruments | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 1,468 906
Commodity contract derivative liability, gross 1,514 958
Not designated as hedging instruments | Commodity Contracts | Marketing and trading assets and other
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivatives asset, gross 1,398 835
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 derivatives asset, gross 70 71
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 1,443 887
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 $ 71 $ 71