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Inventory, Linefill and Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Inventory by category    
Inventory $ 914 $ 1,065
Linefill and base gas 864 798
Long-term inventory 264 251
Total 2,042 2,114
Inventory valuation adjustments 37  
Crude oil
    
Inventory by category    
Inventory 645 540
Linefill and base gas 681 679
Long-term inventory 214 202
Inventory, Volumes (in barrels or in Mcf) 7,274,000 6,951,000
Linefill and base gas, Volumes (in barrels or in Mcf) 11,031,000 10,966,000
Long-term inventory, Volumes (in barrels or Mcf) 2,655,000 2,498,000
Inventory, Price/Unit of measure (in dollars per unit) 88.67 77.69
Linefill and base gas, Price/Unit of measure (in dollars per unit) 61.74 61.92
Long-term inventory, Price/Unit of measure (in dollars per unit) 80.60 80.86
NGL
    
Inventory by category    
Inventory 181 352
Linefill and base gas 61 62
Long-term inventory 50 49
Inventory, Volumes (in barrels or in Mcf) 3,846,000 8,061,000
Linefill and base gas, Volumes (in barrels or in Mcf) 1,431,000 1,341,000
Long-term inventory, Volumes (in barrels or Mcf) 1,210,000 1,161,000
Inventory, Price/Unit of measure (in dollars per unit) 47.06 43.67
Linefill and base gas, Price/Unit of measure (in dollars per unit) 42.63 46.23
Long-term inventory, Price/Unit of measure (in dollars per unit) 41.32 42.20
Natural gas
    
Inventory by category    
Inventory 61 150
Linefill and base gas 122 57
Inventory, Volumes (in barrels or in Mcf) 12,660,000 40,505,000
Linefill and base gas, Volumes (in barrels or in Mcf) 25,612,000 16,615,000
Inventory, Price/Unit of measure (in dollars per unit) 4.82 3.70
Linefill and base gas, Price/Unit of measure (in dollars per unit) 4.76 3.43
Inventory valuation adjustments 37  
Other
    
Inventory by category    
Inventory $ 27 $ 23