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Inventories
3 Months Ended
Mar. 31, 2020
Inventories  
Inventories

4. Inventories

Major classes of inventory at March 31, 2020, December 31, 2019 and March 31, 2019 are as follows:

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