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Inventory, Linefill and Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Inventory by category          
Inventory $ 892   $ 892   $ 1,209
Linefill and base gas 707   707   707
Long-term inventory 207   207   274
Total 1,806   1,806   2,190
Inventory-related disclosures          
Non-cash charges related to the write-down of inventory 0 121 0 121  
Crude oil
          
Inventory by category          
Inventory 471   471   737
Linefill and base gas 585   585   583
Long-term inventory 157   157   149
Inventory, Volumes (in barrels or in Mcf) 5,484,000   5,484,000   9,492,000
Linefill and base gas, Volumes (in barrels or in Mcf) 10,026,000   10,026,000   9,919,000
Long-term inventory, Volumes (in barrels or Mcf) 2,038,000   2,038,000   1,962,000
Inventory, Price/Unit of measure (in dollars per unit) 85.89   85.89   77.64
Linefill and base gas, Price/Unit of measure (in dollars per unit) 58.35   58.35   58.78
Long-term inventory, Price/Unit of measure (in dollars per unit) 77.04   77.04   75.94
NGL
          
Inventory by category          
Inventory 316   316   388
Linefill and base gas 64   64   70
Long-term inventory 50   50   125
Inventory, Volumes (in barrels or in Mcf) 8,366,000   8,366,000   9,472,000
Linefill and base gas, Volumes (in barrels or in Mcf) 1,358,000   1,358,000   1,400,000
Long-term inventory, Volumes (in barrels or Mcf) 1,162,000   1,162,000   3,238,000
Inventory, Price/Unit of measure (in dollars per unit) 37.77   37.77   40.96
Linefill and base gas, Price/Unit of measure (in dollars per unit) 47.13   47.13   50.00
Long-term inventory, Price/Unit of measure (in dollars per unit) 43.03   43.03   38.60
Natural gas
          
Inventory by category          
Inventory 78   78   60
Linefill and base gas 58   58   54
Inventory, Volumes (in barrels or in Mcf) 23,058,000   23,058,000   20,374,000
Linefill and base gas, Volumes (in barrels or in Mcf) 16,965,000   16,965,000   15,755,000
Inventory, Price/Unit of measure (in dollars per unit) 3.38   3.38   2.94
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.42   3.42   3.43
Other
          
Inventory by category          
Inventory $ 27   $ 27   $ 24