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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventories  
Major classes of inventory

June 30,

December 31,

June 30,

    

2020

    

2019

    

2019

    

 

Finished goods

$

833

$

872

$

838

Raw materials

 

129

 

128

 

131

Operating supplies

 

42

 

45

 

46

$

1,004

$

1,045

$

1,015