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Inventories
 3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
March 31, 2020December 31, 2019
Finished goods$723  $671  
Work-in-process1,352  1,316  
Purchased raw materials339  343  
Operating supplies98  99  
Total inventories$2,512  $2,429  
At March 31, 2020 and December 31, 2019, the portion of inventories valued on a last-in, first-out (LIFO) basis was $1,295 and $1,257, respectively. If valued on an average-cost basis, total inventories would have been $423 and $445 higher at March 31, 2020 and December 31, 2019, respectively.