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Inventories (Tables)
 6 Months Ended
Jun. 30, 2024
Inventories [Abstract]  
Inventory Amounts by Product Type
Our inventory amounts by product type were as follows at the dates indicated:

   
June 30,
2024
    
December 31,
2023
  
NGLs
  
$
2,232
    
$
2,392
  
Petrochemicals and refined products
    
530
      
536
  
Crude oil
    
587
      
419
  
Natural gas
    
7
      
5
  
Total
  
$
3,356
    
$
3,352
  
Cost of Sales and Lower of Cost or Market Adjustments
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,
  
 
2024
  
2023
  
2024
  
2023
  
Cost of sales (1)
  
$
10,184
    
$
7,679
    
$
21,589
    
$
17,010
  
Lower of cost or net realizable value adjustments
   recognized in cost of sales
    
1
      
2
      
2
      
9
  

(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.