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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
Mar. 31, 2021
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2020
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Inventory by category    
Inventory $ 484 $ 647
Linefill and base gas 983 982
Long-term inventory 178 130
Total $ 1,645 $ 1,759
Crude oil    
Inventory by category    
Inventory, Volumes (in barrels) | bbl 8,896 13,450
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 14,653 14,669
Long-term inventory, Volumes (in barrels) | bbl 2,669 2,499
Inventory $ 373 $ 441
Linefill and base gas 828 828
Long-term inventory $ 154 $ 111
Inventory (Price/Unit of measure) | $ / bbl 41.93 32.79
Linefill and base gas (Price/Unit of measure) | $ / bbl 56.51 56.45
Long-term inventory (Price/Unit of measure) | $ / bbl 57.70 44.42
NGL    
Inventory by category    
Inventory, Volumes (in barrels) | bbl 4,872 12,302
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,650 1,640
Long-term inventory, Volumes (in barrels) | bbl 1,105 1,185
Inventory $ 105 $ 199
Linefill and base gas 45 44
Long-term inventory $ 24 $ 19
Inventory (Price/Unit of measure) | $ / bbl 21.55 16.18
Linefill and base gas (Price/Unit of measure) | $ / bbl 27.27 26.83
Long-term inventory (Price/Unit of measure) | $ / bbl 21.72 16.03
Natural gas    
Inventory by category    
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 25,576 25,576
Linefill and base gas $ 110 $ 110
Linefill and base gas (Price/Unit of measure) | $ / Mcf 4.30 4.30
Other    
Inventory by category    
Inventory $ 6 $ 7