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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Sep. 30, 2017
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2016
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Inventory by category    
Inventory $ 884 $ 1,343
Linefill and base gas 884 896
Long-term inventory 135 193
Total 1,903 2,432
Crude oil    
Inventory by category    
Inventory 480 1,049
Linefill and base gas 729 710
Long-term inventory $ 86 $ 163
Inventory, Volumes (in barrels or in Mcf) | bbl 10,632 23,589
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,477 12,273
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,800 3,279
Inventory (Price/Unit of measure) | $ / bbl 45.15 44.47
Linefill and base gas (Price/Unit of measure) | $ / bbl 58.43 57.85
Long-term inventory (Price/Unit of measure) | $ / bbl 47.78 49.71
NGL    
Inventory by category    
Inventory $ 390 $ 242
Linefill and base gas 47 45
Long-term inventory $ 49 $ 30
Inventory, Volumes (in barrels or in Mcf) | bbl 16,604 13,497
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,630 1,660
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,120 1,418
Inventory (Price/Unit of measure) | $ / bbl 23.49 17.93
Linefill and base gas (Price/Unit of measure) | $ / bbl 28.83 27.11
Long-term inventory (Price/Unit of measure) | $ / bbl 23.11 21.16
Natural gas    
Inventory by category    
Inventory   $ 32
Linefill and base gas $ 108 $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf   14,540
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 30,812
Inventory (Price/Unit of measure) | $ / Mcf   2.20
Linefill and base gas (Price/Unit of measure) | $ / Mcf 4.32 4.58
Other    
Inventory by category    
Inventory $ 14 $ 20