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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
numerator
denominator
Dec. 31, 2011
numerator
denominator
Inventory by category    
Inventory $ 1,079 $ 978
Linefill and base gas 577 564
Long-term inventory 146 135
Total 1,802 1,677
Inventory-related disclosures    
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
Crude oil
    
Inventory by category    
Inventory 821 483
Linefill and base gas 526 514
Long-term inventory 138 127
Inventory, Volumes (in barrels or cubic feet) 8,464,000 5,361,000
Linefill and base gas, Volumes (in barrels or cubic feet) 9,410,000 9,366,000
Long-term inventory, Volumes (in barrels or cubic feet) 1,848,000 1,714,000
Inventory, Price/Unit of measure (in dollars per unit) 97.00 90.10
Linefill and base gas, Price/Unit of measure (in dollars per unit) 55.90 54.88
Long-term inventory, Price/Unit of measure (in dollars per unit) 74.68 74.10
NGL
    
Inventory by category    
Inventory 216 438
Linefill and base gas 2 2
Long-term inventory 8 8
Inventory, Volumes (in barrels or cubic feet) 3,829,000 6,885,000
Linefill and base gas, Volumes (in barrels or cubic feet) 31,000 31,000
Long-term inventory, Volumes (in barrels or cubic feet) 150,000 150,000
Inventory, Price/Unit of measure (in dollars per unit) 56.41 63.62
Linefill and base gas, Price/Unit of measure (in dollars per unit) 64.52 64.52
Long-term inventory, Price/Unit of measure (in dollars per unit) 53.33 53.33
Natural gas
    
Inventory by category    
Inventory 33 51
Linefill and base gas 49 48
Inventory, Volumes (in barrels or cubic feet) 14,453,000,000 16,170,000,000
Linefill and base gas, Volumes (in barrels or cubic feet) 14,105,000,000 14,105,000,000
Inventory, Price/Unit of measure (in dollars per unit) 2.28 3.15
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.47 3.40
Inventory-related disclosures    
Number used to divide into natural gas volumes to convert to barrels 6  
Other
    
Inventory by category    
Inventory $ 9 $ 6