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Related Parties Transactions with Dow (Details) - Dow [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current $ 112   $ 201
Accounts Payable, Related Parties 201   $ 288
Net sales 115 $ 44  
Cost of goods sold 109 24  
Purchases 106 43  
Transfers at Cost $ 82 $ 79