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Inventory, Linefill and Base Gas and Long-term Inventory (Tables)
3 Months Ended
Mar. 31, 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):

 March 31, 2020December 31, 2019
 VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
VolumesUnit of
Measure
Carrying
Value
Price/
Unit (1)
Inventory        
Crude oil7,168  barrels$128  $17.86  8,613  barrels$450  $52.25  
NGL3,992  barrels42  $10.52  7,574  barrels142  $18.75  
OtherN/A   11  N/AN/A 12  N/A
Inventory subtotal  181     604   
Linefill and base gas        
Crude oil14,251  barrels804  $56.42  14,316  barrels826  $57.70  
NGL1,640  barrels41  $25.00  1,701  barrels47  $27.63  
Natural gas25,576  Mcf110  $4.30  24,976  Mcf108  $4.32  
Linefill and base gas subtotal  955     981   
Long-term inventory        
Crude oil2,789  barrels55  $19.72  2,598  barrels152  $58.51  
NGL1,579  barrels18  $11.40  1,707  barrels30  $17.57  
Long-term inventory subtotal  73     182   
Total  $1,209     $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.