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Derivatives (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Gross fair value of derivative assets and liabilities outstanding    
Less: counterparty netting and cash collateral, asset $ (1,197) $ (758)
Less: counterparty netting and cash collateral, liability (1,272) (782)
Total net fair value, asset 232 192
Total net fair value, liability 248 181
Payables in respect of collateral received netted with derivative assets 66 42
Receivables in respect of collateral paid netted with derivative liabilities 141 66
Collateral deposited with clearing houses and brokers 51 173
Credit risk contingent features    
Net derivative liabilities with credit-risk-related contingent features 32 58
Amount of collateral posted 73 27
Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 1,429 950
Commodity contract derivative liability, gross 1,520 963
Cash-flow hedges | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative 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 derivative asset, gross 4 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 1 5
Not designated as hedging instruments | Commodity Contracts
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative asset, gross 1,425 906
Commodity contract derivative liability, gross 1,519 958
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 1,369 835
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 56 71
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities
   
Gross fair value of derivative assets and liabilities outstanding    
Commodity contract derivative liability, gross 1,465 887
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 $ 54 $ 71