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Inventories Schedule of Inventory (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Sep. 01, 2017
Inventory [Line Items]        
Finished products   $ 2,497 $ 2,584  
Semi-finished products   2,076 1,813  
Raw materials and supplies   607 485  
Total inventories   $ 5,180 $ 4,882  
Merger with Dow [Member]        
Inventory [Line Items]        
Fair Value Step-up       $ 2,297
Amortization of Fair Value Step-up $ 272