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Inventories
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
June 30, 2020December 31, 2019
Finished goods$525  $524  
Work-in-process764  741  
Purchased raw materials339  299  
Operating supplies45  43  
Total inventories$1,673  $1,607  

At June 30, 2020 and December 31, 2019, the portion of inventories valued on a last-in, first-out (LIFO) basis was $510 and $503, respectively. If valued on an average-cost basis, total inventories would have been $124 and $133 higher at June 30, 2020 and December 31, 2019, respectively.