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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

(In millions)
June 30, 2019
December 31, 2018
June 30, 2018
Finished products
$
2,103

$
3,022

$
2,611

Semi-finished products
1,373

1,821

1,401

Raw materials
228

191

209

Stores and supplies
214

276

141

Total inventories
$
3,918

$
5,310

$
4,362