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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Amortized to Stock Compensation Expense $ 144  
Equity and Incentive Plan [Member] | Deferred Compensation, Share-based Payments [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incremental Expense 23  
Successor | Equity and Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized Pre-tax Compensation Expense Relate to Stock Options   $ 24
Successor | Equity and Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized Pre-tax Compensation Expense Relate to RSUs   $ 110
Weighted-Average Recognition Period   1 year 332 days
Successor | Equity and Incentive Plan [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-Average Recognition Period   1 year 292 days
Merger with Dow [Domain] | Equity and Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of DuPont Equity Awards 629  
Amortized to Stock Compensation Expense $ 144  
Merger with Dow [Domain] | Common Stock [Member] | Equity and Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
DuPont to DowDuPont share exchange ratio 1.2820  
Merger with Dow [Domain] | Equity Awards [Member] | Equity and Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair Value of DuPont Equity Awards, Consideration exchanged $ 485