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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Jun. 30, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2016
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Inventory by category    
Inventory $ 936 $ 1,343
Linefill and base gas 894 896
Long-term inventory 117 193
Total 1,947 2,432
Crude oil    
Inventory by category    
Inventory 675 1,049
Linefill and base gas 741 710
Long-term inventory $ 77 $ 163
Inventory, Volumes (in barrels or in Mcf) | bbl 14,854 23,589
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,834 12,273
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,922 3,279
Inventory (Price/Unit of measure) | $ / bbl 45.44 44.47
Linefill and base gas (Price/Unit of measure) | $ / bbl 57.74 57.85
Long-term inventory (Price/Unit of measure) | $ / bbl 40.06 49.71
NGL    
Inventory by category    
Inventory $ 245 $ 242
Linefill and base gas 45 45
Long-term inventory $ 40 $ 30
Inventory, Volumes (in barrels or in Mcf) | bbl 11,507 13,497
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,625 1,660
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,863 1,418
Inventory (Price/Unit of measure) | $ / bbl 21.29 17.93
Linefill and base gas (Price/Unit of measure) | $ / bbl 27.69 27.11
Long-term inventory (Price/Unit of measure) | $ / bbl 21.47 21.16
Natural gas    
Inventory by category    
Inventory $ 1 $ 32
Linefill and base gas $ 108 $ 141
Inventory, Volumes (in barrels or in Mcf) | Mcf 316 14,540
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 30,812
Inventory (Price/Unit of measure) | $ / Mcf 3.16 2.20
Linefill and base gas (Price/Unit of measure) | $ / Mcf 4.32 4.58
Other    
Inventory by category    
Inventory $ 15 $ 20