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Stock-Based Compensation Stock Compensation (Narrative) (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Merger with Dow [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of DuPont equity awards converted $ 629        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable [1] 485        
Equity Awards converted but not yet earned 144        
Incremental expense $ 23        
Common Stock [Member] | Merger with Dow [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share exchange ratio, DuPont to DowDuPont 1.2820        
Successor [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares Reserved for Future Issuance 110,000,000   110,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       30,000,000  
Shares in excess must be counted against maximum number of shares granted 30,000,000        
Stock-based compensation cost included in income from continuing operations   $ 33   $ 156  
Tax Benefit from Compensation Expense   $ 12   33  
Successor [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax Benefit from Compensation Expense       $ 10  
Predecessor [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation cost included in income from continuing operations     $ 85   $ 118
Tax Benefit from Compensation Expense     $ 49   $ 39
[1] Represents the fair value of replacement awards issued for Historical DuPont's equity awards outstanding immediately before the Merger and attributable to the service periods prior to the Merger. The previous Historical DuPont equity awards were converted into the right to receive 1.2820 shares of DowDuPont Common Stock.