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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory by category    
Inventory $ 1,031 $ 1,209
Linefill and base gas 704 707
Long-term inventory 244 274
Total 1,979 2,190
Inventory-related disclosures    
Ratio of Mcf of natural gas to crude Btu 6 6
Crude oil
    
Inventory by category    
Inventory 780 737
Linefill and base gas 582 583
Long-term inventory 155 149
Inventory, Volumes (in barrels or in Mcf) 9,173,000 9,492,000
Linefill and base gas, Volumes (in barrels or in Mcf) 9,946,000 9,919,000
Long-term inventory, Volumes (in barrels or Mcf) 2,035,000 1,962,000
Inventory, Price/Unit of measure (in dollars per unit) 85.03 77.64
Linefill and base gas, Price/Unit of measure (in dollars per unit) 58.52 58.78
Long-term inventory, Price/Unit of measure (in dollars per unit) 76.17 75.94
NGL
    
Inventory by category    
Inventory 132 388
Linefill and base gas 68 70
Long-term inventory 89 125
Inventory, Volumes (in barrels or in Mcf) 2,974,000 9,472,000
Linefill and base gas, Volumes (in barrels or in Mcf) 1,400,000 1,400,000
Long-term inventory, Volumes (in barrels or Mcf) 2,221,000 3,238,000
Inventory, Price/Unit of measure (in dollars per unit) 44.38 40.96
Linefill and base gas, Price/Unit of measure (in dollars per unit) 48.57 50.00
Long-term inventory, Price/Unit of measure (in dollars per unit) 40.07 38.60
Natural gas
    
Inventory by category    
Inventory 88 60
Linefill and base gas 54 54
Inventory, Volumes (in barrels or in Mcf) 26,452,000 20,374,000
Linefill and base gas, Volumes (in barrels or in Mcf) 15,755,000 15,755,000
Inventory, Price/Unit of measure (in dollars per unit) 3.33 2.94
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.43 3.43
Inventory-related disclosures    
Number used to divide into natural gas volumes to convert to barrels 6 6
Other
    
Inventory by category    
Inventory $ 31 $ 24