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Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Inventories [Abstract]  
Inventory Amounts by Product Type
Our inventory amounts by product type were as follows at the dates indicated:

 
 
December 31,
 
 
 
2022
   
2021
 
NGLs
 
$
1,689
   
$
2,027
 
Petrochemicals and refined products
   
430
     
343
 
Crude oil
   
411
     
285
 
Natural gas
   
24
     
26
 
Total
 
$
2,554
   
$
2,681
 
Cost of Sales and Lower of Cost or Market Adjustments
The following table presents our total cost of sales amounts and lower of cost or net realizable value adjustments for the years indicated:

 
For the Year Ended December 31,
 
 
2022
 
2021
 
2020
 
Cost of sales (1)
 
$
45,836
   
$
29,887
   
$
16,723
 
Lower of cost or net realizable value adjustments recognized in cost of sales
   
19
     
20
     
60
 

(1)
Cost of sales is a component of “Operating costs and expenses,” as presented on our 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.