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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventories  
Major classes of inventory

March 31,

December 31,

March 31,

    

2021

    

2020

    

2020

    

 

Finished goods

$

672

$

675

$

884

Raw materials

 

119

 

129

 

121

Operating supplies

 

36

 

37

 

42

$

827

$

841

$

1,047