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Summary of Significant Accounting Policies (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
denominator
numerator
Dec. 31, 2010
numerator
denominator
Dec. 31, 2009
Inventory-related disclosures      
Gain on sale of linefill $ 21,000,000 $ 21,000,000 $ 4,000,000
Proceeds from sale of pipeline linefill 56,000,000 72,000,000 24,000,000
Numerator for ratio of Mcf of natural gas to crude Btu 6 6  
Denominator for ratio of Mcf of natural gas to crude Btu 1 1  
Inventory by category      
Inventory 978,000,000 1,491,000,000  
Linefill and base gas 564,000,000 519,000,000  
Long-term inventory 135,000,000 154,000,000  
Total 1,677,000,000 2,164,000,000  
Crude oil
      
Inventory by category      
Inventory 483,000,000 1,100,000,000  
Linefill and base gas 514,000,000 478,000,000  
Long-term inventory 127,000,000 128,000,000  
Inventory, Volumes (in barrels or cubic feet) 5,361,000 14,132,000  
Linefill and base gas, Volumes (in barrels or cubic feet) 9,366,000 9,159,000  
Long-term inventory, Volumes (in barrels or cubic feet) 1,714,000 1,761,000  
Inventory, Price/Unit of measure (in dollars per unit) 90.10 77.84  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 54.88 52.19  
Long-term inventory, Price/Unit of measure (in dollars per unit) 74.10 72.69  
LPG
      
Inventory by category      
Inventory 438,000,000 366,000,000  
Linefill and base gas 2,000,000 4,000,000  
Long-term inventory 8,000,000 26,000,000  
Inventory, Volumes (in barrels or cubic feet) 6,885,000 7,395,000  
Linefill and base gas, Volumes (in barrels or cubic feet) 31,000 77,000  
Long-term inventory, Volumes (in barrels or cubic feet) 150,000 505,000  
Inventory, Price/Unit of measure (in dollars per unit) 63.62 49.49  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 64.52 51.95  
Long-term inventory, Price/Unit of measure (in dollars per unit) 53.33 51.49  
Other
      
Inventory by category      
Inventory 6,000,000 25,000,000  
Natural gas
      
Inventory-related disclosures      
Number used to divide into natural gas volumes to convert to barrels 6    
Inventory by category      
Inventory 51,000,000    
Linefill and base gas 48,000,000 37,000,000  
Inventory, Volumes (in barrels or cubic feet) 16,170,000,000 13,000,000  
Linefill and base gas, Volumes (in barrels or cubic feet) 14,105,000,000 11,194,000,000  
Inventory, Price/Unit of measure (in dollars per unit) 3.15 3.87  
Linefill and base gas, Price/Unit of measure (in dollars per unit) $ 3.40 $ 3.31