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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Jun. 30, 2021
USD ($)
$ / bbl
$ / Mcf
bbl
Mcf
Dec. 31, 2020
USD ($)
$ / bbl
$ / Mcf
bbl
Mcf
Inventory by category    
Inventory $ 675 $ 647
Linefill and base gas 909 982
Long-term inventory 210 130
Total $ 1,794 $ 1,759
Crude oil    
Inventory by category    
Inventory, Volumes (in barrels) | bbl 9,674 13,450
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 15,164 14,669
Long-term inventory, Volumes (in barrels) | bbl 2,699 2,499
Inventory $ 508 $ 441
Linefill and base gas 864 828
Long-term inventory $ 183 $ 111
Inventory (Price/Unit of measure) | $ / bbl 52.51 32.79
Linefill and base gas (Price/Unit of measure) | $ / bbl 56.98 56.45
Long-term inventory (Price/Unit of measure) | $ / bbl 67.80 44.42
NGL    
Inventory by category    
Inventory, Volumes (in barrels) | bbl 7,097 12,302
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,636 1,640
Long-term inventory, Volumes (in barrels) | bbl 1,258 1,185
Inventory $ 162 $ 199
Linefill and base gas 45 44
Long-term inventory $ 27 $ 19
Inventory (Price/Unit of measure) | $ / bbl 22.83 16.18
Linefill and base gas (Price/Unit of measure) | $ / bbl 27.51 26.83
Long-term inventory (Price/Unit of measure) | $ / bbl 21.46 16.03
Natural gas    
Inventory by category    
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 0 25,576
Linefill and base gas $ 0 $ 110
Linefill and base gas (Price/Unit of measure) | $ / Mcf 0 4.30
Natural gas | Disposal Group, Disposed of by Sale | Pine Prairie and Southern Pines Natural Gas Storage Facilities    
Inventory by category    
Linefill and base gas $ 110  
Other    
Inventory by category    
Inventory $ 5 $ 7