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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Mar. 31, 2017
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Dec. 31, 2016
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Inventory by category    
Inventory $ 1,219 $ 1,343
Linefill and base gas 883 896
Long-term inventory 131 193
Total 2,233 2,432
Crude oil    
Inventory by category    
Inventory 1,071 1,049
Linefill and base gas 729 710
Long-term inventory $ 101 $ 163
Inventory, Volumes (in barrels or in Mcf) | bbl 21,710 23,589
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,679 12,273
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,345 3,279
Inventory, Price/Unit of measure | $ / bbl 49.33 44.47
Linefill and base gas, Price/Unit of measure | $ / bbl 57.50 57.85
Long-term inventory, Price/Unit of measure | $ / bbl 43.07 49.71
NGL    
Inventory by category    
Inventory $ 120 $ 242
Linefill and base gas 46 45
Long-term inventory $ 30 $ 30
Inventory, Volumes (in barrels or in Mcf) | bbl 5,396 13,497
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,646 1,660
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,418 1,418
Inventory, Price/Unit of measure | $ / bbl 22.24 17.93
Linefill and base gas, Price/Unit of measure | $ / bbl 27.95 27.11
Long-term inventory, Price/Unit of measure | $ / bbl 21.16 21.16
Natural gas    
Inventory by category    
Inventory $ 10 $ 32
Linefill and base gas $ 108 $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf 3,630 14,540
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 30,812
Inventory, Price/Unit of measure | $ / Mcf 2.75 2.20
Linefill and base gas, Price/Unit of measure | $ / Mcf 4.32 4.58
Other    
Inventory by category    
Inventory $ 18 $ 20