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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Inventory by category        
Inventory $ 1,172 $ 1,172   $ 978
Linefill and base gas 645 645   564
Long-term inventory 291 291   135
Total 2,108 2,108   1,677
Inventory-related disclosures        
Ratio of Mcf of natural gas to crude Btu 6 6   6
Non-cash charges related to the write-down of inventory 121 121 2  
Crude oil
        
Inventory by category        
Inventory 636 636   483
Linefill and base gas 517 517   514
Long-term inventory 143 143   127
Inventory, Volumes (in barrels or cubic feet) 7,786,000 7,786,000   5,361,000
Linefill and base gas, Volumes (in barrels or cubic feet) 9,278,000 9,278,000   9,366,000
Long-term inventory, Volumes (in barrels or cubic feet) 1,914,000 1,914,000   1,714,000
Inventory, Price/Unit of measure (in dollars per unit) 81.69 81.69   90.10
Linefill and base gas, Price/Unit of measure (in dollars per unit) 55.72 55.72   54.88
Long-term inventory, Price/Unit of measure (in dollars per unit) 74.71 74.71   74.10
NGL
        
Inventory by category        
Inventory 469 469   438
Linefill and base gas 79 79   2
Long-term inventory 148 148   8
Inventory, Volumes (in barrels or cubic feet) 11,202,000 11,202,000   6,885,000
Linefill and base gas, Volumes (in barrels or cubic feet) 1,685,000 1,685,000   31,000
Long-term inventory, Volumes (in barrels or cubic feet) 3,620,000 3,620,000   150,000
Inventory, Price/Unit of measure (in dollars per unit) 41.87 41.87   63.62
Linefill and base gas, Price/Unit of measure (in dollars per unit) 46.88 46.88   64.52
Long-term inventory, Price/Unit of measure (in dollars per unit) 40.88 40.88   53.33
Natural gas
        
Inventory by category        
Inventory 54 54   51
Linefill and base gas 49 49   48
Inventory, Volumes (in barrels or cubic feet) 23,530,000,000 23,530,000,000   16,170,000,000
Linefill and base gas, Volumes (in barrels or cubic feet) 14,105,000,000 14,105,000,000   14,105,000,000
Inventory, Price/Unit of measure (in dollars per unit) 2.29 2.29   3.15
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.47 3.47   3.40
Inventory-related disclosures        
Number used to divide into natural gas volumes to convert to barrels 6 6   6
Other
        
Inventory by category        
Inventory $ 13 $ 13   $ 6