Commitments and Contingent Liabilities Other PFOA Matters / Fayetteville (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) lawsuits	Sep. 30, 2025 USD ($)	Aug. 03, 2025 USD ($)	Mar. 31, 2019
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%
NEW JERSEY | New Jersey Statewide Settlement [Member]
Loss Contingencies [Line Items]
New Jersey Statewide Settlement Reserve Fund		$ 475,000,000
NEW JERSEY | Chemours [Member]
Loss Contingencies [Line Items]
Purchase of Chemours' Future Interest in Insurance Proceeds			$ 150,000,000
Litigation Settlement, Purchase of Chemours' Future Interest in Insurance Proceeds, Fee Threshold I			35,000,000
Litigation Settlement, Purchase of Chemours' Future Interest in Insurance Proceeds, Fee Threshold II			$ 3,000,000
Purchase of Chemours' Future Interest in Insurance Proceeds, Fee Interest Rate			2.00%
NEW JERSEY | Corteva [Member] | Chemours [Member]
Loss Contingencies [Line Items]
Purchase of Chemours' Future Interest in Insurance Proceeds			$ 44,000,000
NEW JERSEY | DuPont de Nemours [Member] | Chemours [Member]
Loss Contingencies [Line Items]
Purchase of Chemours' Future Interest in Insurance Proceeds			$ 106,000,000
NEW JERSEY | New Jersey Statewide Settlement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number				4
Litigation Settlement, Amount Awarded to Other Party		$ 875,000,000
Litigation Settlement, Amount Awarded to Other Party, Period		25 years
Litigation Settlement, Amount Awarded to Other Party, Present value		$ 500,000,000
Litigation Settlement, Amount Awarded to Other Party, Discount Rate		8.00%
Litigation Settlement, Amount Allocated to Statewide NRD		$ 16,000,000
Litigation Settlement, Percentage of Allocated Statewide NRD for Alleged Statewide AFFF Contamination		25.00%
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		$ 72,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, after Income Tax		$ 58,000,000
NEW JERSEY | New Jersey Statewide Settlement [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Historical DuPont Operating Sites		4
NEW JERSEY | PFAS [Member] | New Jersey Statewide Settlement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number				2
OHIO | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits	2
New Jersey & New York [Member] | PFAS [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits	2
DELAWARE | Natural Resources Damages [Member] | Corteva [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Period for supplemental payment	8 years
Threshold for payments to fund the NRST Trust	$ 50,000,000
Supplemental payment threshold	$ 25,000,000
NORTH CAROLINA | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Property Owners	2,400