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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Mar. 31, 2018
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Inventory by category    
Inventory $ 620 $ 713
Linefill and base gas 870 872
Long-term inventory 159 164
Total 1,649 1,749
Crude oil    
Inventory by category    
Inventory 494 402
Linefill and base gas 719 719
Long-term inventory $ 108 $ 105
Inventory, Volumes (in barrels or in Mcf) | bbl 9,171 7,800
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,428 12,340
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,823 1,870
Inventory (Price/Unit of measure) | $ / bbl 53.87 51.54
Linefill and base gas (Price/Unit of measure) | $ / bbl 57.85 58.27
Long-term inventory (Price/Unit of measure) | $ / bbl 59.24 56.15
NGL    
Inventory by category    
Inventory $ 115 $ 294
Linefill and base gas 43 45
Long-term inventory $ 51 $ 59
Inventory, Volumes (in barrels or in Mcf) | bbl 4,144 10,774
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,596 1,597
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,989 2,167
Inventory (Price/Unit of measure) | $ / bbl 27.75 27.29
Linefill and base gas (Price/Unit of measure) | $ / bbl 26.94 28.18
Long-term inventory (Price/Unit of measure) | $ / bbl 25.64 27.23
Natural gas    
Inventory by category    
Linefill and base gas $ 108 $ 108
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 24,976
Linefill and base gas (Price/Unit of measure) | $ / Mcf 4.32 4.32
Other    
Inventory by category    
Inventory $ 11 $ 17