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Inventory, Linefill and Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventory-related disclosures      
Non-cash charges related to the write-down of inventory $ 7 $ 128 $ 4
Gain on sales of linefill and base gas 7 19 21
Cash received for sales of linefill and base gas 40 65 56
Inventory by category      
Inventory 1,065 1,209  
Linefill and base gas 798 707  
Long-term inventory 251 274  
Total 2,114 2,190  
Crude oil
      
Inventory by category      
Inventory 540 737  
Linefill and base gas 679 583  
Long-term inventory 202 149  
Inventory, Volumes (in barrels or in Mcf) 6,951,000 9,492,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 10,966,000 9,919,000  
Long-term inventory, Volumes (in barrels or Mcf) 2,498,000 1,962,000  
Inventory, Price/Unit of measure (in dollars per unit) 77.69 77.64  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 61.92 58.78  
Long-term inventory, Price/Unit of measure (in dollars per unit) 80.86 75.94  
NGL
      
Inventory by category      
Inventory 352 388  
Linefill and base gas 62 70  
Long-term inventory 49 125  
Inventory, Volumes (in barrels or in Mcf) 8,061,000 9,472,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 1,341,000 1,400,000  
Long-term inventory, Volumes (in barrels or Mcf) 1,161,000 3,238,000  
Inventory, Price/Unit of measure (in dollars per unit) 43.67 40.96  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 46.23 50.00  
Long-term inventory, Price/Unit of measure (in dollars per unit) 42.20 38.60  
Natural gas
      
Inventory by category      
Inventory 150 60  
Linefill and base gas 57 54  
Inventory, Volumes (in barrels or in Mcf) 40,505,000 20,374,000  
Linefill and base gas, Volumes (in barrels or in Mcf) 16,615,000 15,755,000  
Inventory, Price/Unit of measure (in dollars per unit) 3.70 2.94  
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.43 3.43  
Other
      
Inventory by category      
Inventory $ 23 $ 24