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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Jun. 30, 2016
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Dec. 31, 2015
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Inventory by category    
Inventory $ 1,085 $ 916
Linefill and base gas 902 898
Long-term inventory 184 129
Total 2,171 1,943
Crude oil    
Inventory by category    
Inventory 819 608
Linefill and base gas 716 713
Long-term inventory $ 162 $ 106
Inventory, Volumes (in barrels or in Mcf) | bbl 20,013 16,345
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,227 12,298
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 3,396 3,417
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 40.92 37.20
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 58.56 57.98
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 47.70 31.02
NGL    
Inventory by category    
Inventory $ 209 $ 218
Linefill and base gas 45 44
Long-term inventory $ 22 $ 23
Inventory, Volumes (in barrels or in Mcf) | bbl 12,813 13,907
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,355 1,348
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,418 1,652
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 16.31 15.68
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 33.21 32.64
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 15.51 13.92
Natural gas    
Inventory by category    
Inventory $ 31 $ 53
Linefill and base gas $ 141 $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf 15,055 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 2.06 2.40
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.58 4.58
Other    
Inventory by category    
Inventory $ 26 $ 37