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Inventory, Linefill and Base Gas and Long-term Inventory (Tables)
6 Months Ended
Jun. 30, 2020
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):

 June 30, 2020December 31, 2019
 VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
Inventory        
Crude oil20,306  barrels$512  $25.21  8,613  barrels$450  $52.25  
NGL10,923  barrels140  $12.82  7,574  barrels142  $18.75  
OtherN/A 10  N/AN/A 12  N/A
Inventory subtotal  662     604   
Linefill and base gas        
Crude oil14,491  barrels810  $55.90  14,316  barrels826  $57.70  
NGL1,645  barrels42  $25.53  1,701  barrels47  $27.63  
Natural gas25,576  Mcf110  $4.30  24,976  Mcf108  $4.32  
Linefill and base gas subtotal  962     981   
Long-term inventory        
Crude oil2,747  barrels104  $37.86  2,598  barrels152  $58.51  
NGL1,579  barrels21  $13.30  1,707  barrels30  $17.57  
Long-term inventory subtotal  125     182   
Total  $1,749     $1,767   

(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.