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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventories  
Major classes of inventory

March 31,

December 31,

March 31,

    

2020

    

2019

    

2019

    

 

Finished goods

$

884

$

872

$

868

Raw materials

 

121

 

128

 

126

Operating supplies

 

42

 

45

 

44

$

1,047

$

1,045

$

1,038