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Derivatives (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Gross and net fair values of outstanding derivatives (in millions)    
Less: counterparty netting and cash collateral, asset $ (476) $ (301)
Less: counterparty netting and cash collateral, liability (529) (371)
Total net fair value, asset 96 118
Total net fair value, liability 64 126
Collateral received netted against derivative assets 37 25
Collateral paid netted against derivative liabilities 90 95
Collateral deposited with clearinghouses and brokers 94 116
Credit risk contingent features    
Net derivative liabilities with credit-risk-related contingent features 25 34
Amount of collateral posted 12 64
Commodity Contracts
   
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 572 419
Commodity contract derivative liability, gross 593 497
Cash-flow hedges | Commodity Contracts
   
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 5 11
Commodity contract derivative liability, gross 1 2
Cash-flow hedges | Commodity Contracts | Other current assets
   
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 5 11
Cash-flow hedges | Commodity Contracts | Accrued liabilities
   
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 1 1
Cash-flow hedges | Commodity Contracts | Deferred credits and other 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 567 408
Commodity contract derivative liability, gross 592 495
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 544 386
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 23 22
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities
   
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 573 479
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 $ 19 $ 16