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Inventory, Linefill and Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Inventory by category          
Inventory $ 1,198   $ 1,198   $ 1,209
Linefill and base gas 770   770   707
Long-term inventory 218   218   274
Total 2,186   2,186   2,190
Inventory-related disclosures          
Non-cash charges related to the write-down of inventory 7 7 7 128  
Crude oil
          
Inventory by category          
Inventory 535   535   737
Linefill and base gas 645   645   583
Long-term inventory 167   167   149
Inventory, Volumes (in barrels or in Mcf) 5,624,000   5,624,000   9,492,000
Linefill and base gas, Volumes (in barrels or in Mcf) 10,520,000   10,520,000   9,919,000
Long-term inventory, Volumes (in barrels or Mcf) 2,134,000   2,134,000   1,962,000
Inventory, Price/Unit of measure (in dollars per unit) 95.13   95.13   77.64
Linefill and base gas, Price/Unit of measure (in dollars per unit) 61.31   61.31   58.78
Long-term inventory, Price/Unit of measure (in dollars per unit) 78.26   78.26   75.94
NGL
          
Inventory by category          
Inventory 539   539   388
Linefill and base gas 64   64   70
Long-term inventory 51   51   125
Inventory, Volumes (in barrels or in Mcf) 13,767,000   13,767,000   9,472,000
Linefill and base gas, Volumes (in barrels or in Mcf) 1,345,000   1,345,000   1,400,000
Long-term inventory, Volumes (in barrels or Mcf) 1,161,000   1,161,000   3,238,000
Inventory, Price/Unit of measure (in dollars per unit) 39.15   39.15   40.96
Linefill and base gas, Price/Unit of measure (in dollars per unit) 47.58   47.58   50.00
Long-term inventory, Price/Unit of measure (in dollars per unit) 43.93   43.93   38.60
Natural gas
          
Inventory by category          
Inventory 101   101   60
Linefill and base gas 61   61   54
Inventory, Volumes (in barrels or in Mcf) 29,443,000   29,443,000   20,374,000
Linefill and base gas, Volumes (in barrels or in Mcf) 17,615,000   17,615,000   15,755,000
Inventory, Price/Unit of measure (in dollars per unit) 3.43   3.43   2.94
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.46   3.46   3.43
Other
          
Inventory by category          
Inventory $ 23   $ 23   $ 24