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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Inventory by category      
Inventory $ 877   $ 916
Linefill and base gas 899   898
Long-term inventory 112   129
Total 1,888   1,943
Inventory-related disclosures      
Charge related to the write-down of inventory 3 $ 24  
Crude oil      
Inventory by category      
Inventory 711   608
Linefill and base gas 711   713
Long-term inventory $ 92   $ 106
Inventory, Volumes (in barrels or in Mcf) | bbl 21,073   16,345
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,060   12,298
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 3,333   3,417
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 33.74   37.20
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 58.96   57.98
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 27.60   31.02
NGL      
Inventory by category      
Inventory $ 102   $ 218
Linefill and base gas 47   44
Long-term inventory $ 20   $ 23
Inventory, Volumes (in barrels or in Mcf) | bbl 6,512   13,907
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,348   1,348
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,652   1,652
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 15.66   15.68
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 34.87   32.64
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 12.11   13.92
Natural gas      
Inventory by category      
Inventory $ 34   $ 53
Linefill and base gas $ 141   $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf 17,150   22,080
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 30,812   30,812
Inventory, Price/Unit of measure (in dollars per unit) | $ / Mcf 1.98   2.40
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.58   4.58
Other      
Inventory by category      
Inventory $ 30   $ 37