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Inventories
6 Months Ended
Jun. 30, 2023
Inventories [Abstract]  
Inventories
Note 3.  Inventories

Our inventory amounts by product type were as follows at the dates indicated:

   
June 30,
2023
   
December 31,
2022
 
NGLs
 
$
1,678
   
$
1,689
 
Petrochemicals and refined products
   
273
     
430
 
Crude oil
   
530
     
411
 
Natural gas
   
16
     
24
 
Total
 
$
2,497
   
$
2,554
 

Due to fluctuating commodity prices, we recognize lower of cost or net realizable value adjustments when the carrying value of our available-for-sale inventories exceeds their net realizable value.  The following table presents our total cost of sales amounts and lower of cost or net realizable value adjustments for the periods indicated:

 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
 
 
2023
 
2022
 
2023
 
2022
 
Cost of sales (1)
 
$
7,679
   
$
12,908
   
$
17,010
   
$
23,006
 
Lower of cost or net realizable value adjustments
   recognized in cost of sales
   
2
     
3
     
9
     
7
 

(1)
Cost of sales is a component of “Operating costs and expenses” as presented on our Unaudited Condensed Statements of Consolidated Operations.  Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.