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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2015
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Inventory by category      
Inventory $ 941   $ 891
Linefill and base gas 976   930
Long-term inventory 159   186
Total 2,076   2,007
Inventory-related disclosures      
Charge related to the write-down of inventory 24 $ 37  
Crude oil      
Inventory by category      
Inventory 649   304
Linefill and base gas 790   744
Long-term inventory $ 134   $ 136
Inventory, Volumes (in barrels or in Mcf) | bbl 12,916   6,465
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 13,195   11,810
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,420   2,582
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 50.25   47.02
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 59.87   63.00
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 55.37   52.67
NGL      
Inventory by category      
Inventory $ 213   $ 454
Linefill and base gas 48   52
Long-term inventory $ 25   $ 50
Inventory, Volumes (in barrels or in Mcf) | bbl 12,931   13,553
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,348   1,212
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,652   1,681
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 16.47   33.50
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 35.61   42.90
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 15.13   29.74
Natural gas      
Inventory by category      
Inventory $ 45   $ 102
Linefill and base gas $ 138   $ 134
Inventory, Volumes (in barrels or in Mcf) | Mcf 16,342   32,317
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 29,812   28,612
Inventory, Price/Unit of measure (in dollars per unit) | $ / Mcf 2.75   3.16
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.63   4.68
Other      
Inventory by category      
Inventory $ 34   $ 31