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Inventories
3 Months Ended
Mar. 31, 2022
Inventories  
Inventories

4. Inventories

Major classes of inventory at March 31, 2022, December 31, 2021 and March 31, 2021 are as follows:

March 31,

December 31,

March 31,

    

2022

    

2021

    

2021

Finished goods

$

676

$

659

$

672

Raw materials

 

121

 

119

 

119

Operating supplies

 

40

 

38

 

36

$

837

$

816

$

827