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Commitments and Contingent Liabilities Chemours (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Jun. 30, 2029
Mar. 31, 2029
Dec. 31, 2028
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2022
Jun. 30, 2022
Corteva [Member]                
Loss Contingencies [Line Items]                
Stray liability sharing percentage 29.00%              
DuPont de Nemours [Member]                
Loss Contingencies [Line Items]                
Stray liability sharing percentage 71.00%              
Chemours [Member] | Accounts and Notes Receivable [Member]                
Loss Contingencies [Line Items]                
Indemnification Assets $ 138       $ 43 $ 51    
Chemours [Member] | Other Assets [Member]                
Loss Contingencies [Line Items]                
Indemnification Assets 466       $ 280 261    
PFAS [Member]                
Loss Contingencies [Line Items]                
MOU Terms for Withdrawals $ 125              
Threshold to waive MOU escrow account funding obligation           $ 100    
PFAS [Member] | Maximum [Member]                
Loss Contingencies [Line Items]                
Cost Sharing Arrangement Term 20 years              
Qualified Spend and Escrow Account Contribution Threshold $ 4,000              
PFAS [Member] | Maximum [Member] | Subsequent Event                
Loss Contingencies [Line Items]                
Escrow Account Balance       $ 700        
PFAS [Member] | Chemours [Member]                
Loss Contingencies [Line Items]                
Escrow Account Deposit Percentage 50.00%              
PFAS [Member] | Chemours [Member] | Maximum [Member] | Subsequent Event                
Loss Contingencies [Line Items]                
Total Escrow Deposit Amount   $ 500            
PFAS [Member] | Chemours [Member] | No later than September 30 of each subsequent year through and including 2028 | Subsequent Event                
Loss Contingencies [Line Items]                
Annual Escrow Deposit, remainder of period     $ 50          
PFAS [Member] | Corteva [Member]                
Loss Contingencies [Line Items]                
Stray liability sharing percentage for PFAS 50.00%              
PFAS [Member] | Corteva [Member] | Maximum [Member]                
Loss Contingencies [Line Items]                
Qualified Spend and Escrow Account Contribution Threshold $ 600              
PFAS [Member] | DuPont de Nemours [Member]                
Loss Contingencies [Line Items]                
Stray liability sharing percentage for PFAS 50.00%              
PFAS [Member] | Corteva and DuPont                
Loss Contingencies [Line Items]                
Stray liability sharing percentage for PFAS 50.00%              
Amount credited to each company's threshold $ 150              
Escrow Account Deposit Percentage 50.00%              
PFAS [Member] | Corteva and DuPont | Maximum [Member]                
Loss Contingencies [Line Items]                
Qualified Spend and Escrow Account Contribution Threshold $ 2,000              
Corteva and Dupont stray liability threshold for PFAS $ 300              
PFAS [Member] | Corteva and DuPont | Maximum [Member] | Subsequent Event                
Loss Contingencies [Line Items]                
Total Escrow Deposit Amount     $ 500          
PFAS [Member] | Corteva and DuPont | No later than September 30 of each subsequent year through and including 2028                
Loss Contingencies [Line Items]                
Annual Escrow Deposit, remainder of period             $ 50  
PFAS [Member] | Chemours [Member]                
Loss Contingencies [Line Items]                
Annual Escrow Deposit               $ 100
PFAS [Member] | DuPont de Nemours and Corteva                
Loss Contingencies [Line Items]                
Annual Escrow Deposit               $ 100