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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Mar. 31, 2019
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2018
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Inventory by category    
Inventory $ 498 $ 640
Linefill and base gas 907 916
Long-term inventory 181 136
Total 1,586 1,692
Crude oil    
Inventory by category    
Inventory 439 367
Linefill and base gas 751 761
Long-term inventory $ 129 $ 79
Inventory, Volumes (in barrels or in Mcf) | bbl 8,949 9,657
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 13,169 13,312
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,315 1,890
Inventory (Price/Unit of measure) | $ / bbl 49.06 38.00
Linefill and base gas (Price/Unit of measure) | $ / bbl 57.03 57.17
Long-term inventory (Price/Unit of measure) | $ / bbl 55.72 41.80
NGL    
Inventory by category    
Inventory $ 45 $ 262
Linefill and base gas 48 47
Long-term inventory $ 52 $ 57
Inventory, Volumes (in barrels or in Mcf) | bbl 2,366 10,384
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,720 1,730
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,363 2,368
Inventory (Price/Unit of measure) | $ / bbl 19.02 25.23
Linefill and base gas (Price/Unit of measure) | $ / bbl 27.91 27.17
Long-term inventory (Price/Unit of measure) | $ / bbl 22.01 24.07
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 $ 14 $ 11