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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventory-related disclosures      
Gain on sale of linefill $ 19 $ 21 $ 21
Proceeds from sale of pipeline linefill 65 56 72
Non-cash charges related to the write-down of inventory 128 4 3
Ratio of Mcf of natural gas to crude Btu 6 6  
Inventory by category      
Inventory 1,209 978  
Linefill and base gas 707 564  
Long-term inventory 274 135  
Total 2,190 1,677  
Crude oil
      
Inventory by category      
Inventory 737 483  
Linefill and base gas 583 514  
Long-term inventory 149 127  
Inventory, Volumes (in barrels or in Mcf) 9,492,000 5,361,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 9,919,000 9,366,000  
Long-term inventory, Volumes (in barrels or Mcf) 1,962,000 1,714,000  
Inventory, Price/Unit of measure (in dollars per unit) 77.64 90.10  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 58.78 54.88  
Long-term inventory, Price/Unit of measure (in dollars per unit) 75.94 74.10  
NGL
      
Inventory by category      
Inventory 388 438  
Linefill and base gas 70 2  
Long-term inventory 125 8  
Inventory, Volumes (in barrels or in Mcf) 9,472,000 6,885,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 1,400,000 31,000  
Long-term inventory, Volumes (in barrels or Mcf) 3,238,000 150,000  
Inventory, Price/Unit of measure (in dollars per unit) 40.96 63.62  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 50.00 64.52  
Long-term inventory, Price/Unit of measure (in dollars per unit) 38.60 53.33  
Natural gas
      
Inventory-related disclosures      
Number used to divide into natural gas volumes to convert to barrels 6    
Inventory by category      
Inventory 60 51  
Linefill and base gas 54 48  
Inventory, Volumes (in barrels or in Mcf) 20,374,000 16,170,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 15,755,000 14,105,000  
Inventory, Price/Unit of measure (in dollars per unit) 2.94 3.15  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.43 3.40  
Other
      
Inventory by category      
Inventory $ 24 $ 6