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Inventories Schedule of Inventory (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Sep. 01, 2017
Inventory [Line Items]              
Finished products       $ 2,684   $ 2,584  
Semi-finished products       1,850   1,813  
Raw materials and supplies       498   485  
Total inventories       5,032   $ 4,882  
Merger with Dow [Member]              
Inventory [Line Items]              
Fair Value Step-up             $ 2,297
Amortization of Fair Value Step-up $ 15 $ 52 $ 205 $ 272 $ 1,554