Commitments and Contingent Liabilities PFOA / Leach Settlement (Details)	3 Months Ended		9 Months Ended	12 Months Ended	162 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2021 USD ($) lawsuits	Dec. 31, 2004 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) lawsuits	Jun. 01, 2023 USD ($)	Jan. 01, 2012
MDL Settlement [Domain]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party		$ 59,000,000	$ 83,000,000
MDL Settlement [Domain] | Corteva [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements	$ 8,000,000		27,000,000
MDL Settlement [Domain] | Chemours [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party			29,000,000
MDL Settlement [Domain] | DuPont de Nemours and Corteva
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party			$ 27,000,000
Nationwide Water District Settlement
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss							$ 1,185,000,000
Number of water district opt-outs						900
Water Districts remaining in Settlement Class						93.00%
PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Binding Settlement Agreement Class Size				80,000
Loss Contingency, Number Of Water Districts Receiving Water Treatment								6
Litigation Settlement, Liability For Medical Monitoring Program, Threshold				$ 235,000,000
Litigation Settlement, Medical Monitoring Program, Escrow Account, Disbursements To Date					$ 2,000,000
Escrow Balance						$ 1,000,000
PFOA Matters: Drinking Water Actions [Member] | MDL Settlement [Domain] | Settled Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits			95
Firefighting Foam [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits						10,100