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Inventory, Linefill and Base Gas and Long-term Inventory (Tables)
3 Months Ended
Mar. 31, 2021
Inventory, Linefill and Base Gas and Long-term Inventory  
Schedule of inventory, linefill and base gas and long-term inventory
Inventory, linefill and base gas and long-term inventory consisted of the following (barrels and natural gas volumes in thousands and carrying value in millions):

 March 31, 2021December 31, 2020
 VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
Inventory        
Crude oil8,896 barrels$373 $41.93 13,450 barrels$441 $32.79 
NGL4,872 barrels105 $21.55 12,302 barrels199 $16.18 
OtherN/A N/AN/A N/A
Inventory subtotal  484    647  
Linefill and base gas        
Crude oil14,653 barrels828 $56.51 14,669 barrels828 $56.45 
NGL1,650 barrels45 $27.27 1,640 barrels44 $26.83 
Natural gas25,576 Mcf110 $4.30 25,576 Mcf110 $4.30 
Linefill and base gas subtotal  983    982  
Long-term inventory        
Crude oil2,669 barrels154 $57.70 2,499 barrels111 $44.42 
NGL1,105 barrels24 $21.72 1,185 barrels19 $16.03 
Long-term inventory subtotal  178    130  
Total  $1,645    $1,759  

(1)Price per unit of measure is comprised of a weighted average associated with various grades, qualities and locations. Accordingly, these prices may not coincide with any published benchmarks for such products.