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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Jun. 30, 2019
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2018
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Inventory by category    
Inventory $ 558 $ 640
Linefill and base gas 922 916
Long-term inventory 152 136
Total 1,632 1,692
Crude oil    
Inventory by category    
Inventory 427 367
Linefill and base gas 766 761
Long-term inventory $ 126 $ 79
Inventory, Volumes (in barrels or in Mcf) | bbl 8,177 9,657
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 13,325 13,312
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,448 1,890
Inventory (Price/Unit of measure) | $ / bbl 52.22 38.00
Linefill and base gas (Price/Unit of measure) | $ / bbl 57.49 57.17
Long-term inventory (Price/Unit of measure) | $ / bbl 51.47 41.80
NGL    
Inventory by category    
Inventory $ 117 $ 262
Linefill and base gas 48 47
Long-term inventory $ 26 $ 57
Inventory, Volumes (in barrels or in Mcf) | bbl 6,887 10,384
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,699 1,730
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,875 2,368
Inventory (Price/Unit of measure) | $ / bbl 16.99 25.23
Linefill and base gas (Price/Unit of measure) | $ / bbl 28.25 27.17
Long-term inventory (Price/Unit of measure) | $ / bbl 13.87 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