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Related Parties Narrative (Details) - USD ($)
$ in Millions
4 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Nov. 02, 2017
DowDuPont [Member]      
Related Party Transaction [Line Items]      
Accounts payable $ 354 $ 103  
Successor [Member]      
Related Party Transaction [Line Items]      
Distributions to DowDuPont 829 2,806  
Successor [Member] | Dow [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Purchases from Related Party 49 320  
Related Party Transaction, Transfers at Cost from Related Party   343  
Accounts payable 26 288  
Successor [Member] | DowDuPont [Member]      
Related Party Transaction [Line Items]      
Distributions to DowDuPont $ 829 $ 2,806  
2017 Share Repurchase Program [Member] | Successor [Member]      
Related Party Transaction [Line Items]      
Stock Repurchase Program, Authorized Amount     $ 4,000