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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Sep. 30, 2016
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2015
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Inventory by category    
Inventory $ 1,258 $ 916
Linefill and base gas 899 898
Long-term inventory 146 129
Total 2,303 1,943
Crude oil    
Inventory by category    
Inventory 879 608
Linefill and base gas 712 713
Long-term inventory $ 124 $ 106
Inventory, Volumes (in barrels or in Mcf) | bbl 20,494 16,345
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,215 12,298
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 3,428 3,417
Inventory, Price/Unit of measure | $ / bbl 42.89 37.20
Linefill and base gas, Price/Unit of measure | $ / bbl 58.29 57.98
Long-term inventory, Price/Unit of measure | $ / bbl 36.17 31.02
NGL    
Inventory by category    
Inventory $ 321 $ 218
Linefill and base gas 46 44
Long-term inventory $ 22 $ 23
Inventory, Volumes (in barrels or in Mcf) | bbl 21,087 13,907
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,490 1,348
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,418 1,652
Inventory, Price/Unit of measure | $ / bbl 15.22 15.68
Linefill and base gas, Price/Unit of measure | $ / bbl 30.87 32.64
Long-term inventory, Price/Unit of measure | $ / bbl 15.51 13.92
Natural gas    
Inventory by category    
Inventory $ 32 $ 53
Linefill and base gas $ 141 $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf 15,116 22,080
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 30,812 30,812
Inventory, Price/Unit of measure | $ / Mcf 2.12 2.40
Linefill and base gas, Price/Unit of measure | $ / Mcf 4.58 4.58
Other    
Inventory by category    
Inventory $ 26 $ 37