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Related Parties Transactions with Dow (Details) - Successor [Member] - Dow [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current $ 91 $ 91 $ 12
Accounts Payable, Related Parties 117 117 $ 26
Net sales 73 151  
Cost of goods sold 63 126  
Purchases 73 180  
Transfers at Cost $ 93 $ 259