Commitments and Contingent Liabilities PFOA / Leach Settlement (Details)	3 Months Ended		12 Months Ended	105 Months Ended
	Mar. 31, 2021 USD ($) lawsuits	Dec. 31, 2017 USD ($) lawsuits	Dec. 31, 2004 USD ($)	Sep. 30, 2020 USD ($)	Jan. 01, 2012
MDL Settlement [Domain]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 83,000,000
Chemours Contribution to MDL Settlement
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	29,000,000
DuPont de Nemours and Corteva Contribution to MDL Settlement
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	27,000,000
Payments for Legal Settlements	16,000,000
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] | WEST VIRGINIA AND OHIO [Domain] | Scheduled for trial [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | lawsuits	96
PFOA Matters: Drinking Water Actions [Member] | WEST VIRGINIA AND OHIO [Domain] | Settled Litigation
Loss Contingencies [Line Items]
Loss Contingency, Claims Settled, Number | lawsuits	95,000,000
PFOA Matters: Drinking Water Actions [Member] | WEST VIRGINIA AND OHIO [Domain] | Compensatory damages [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 40,000,000
PFOA Matters: Drinking Water Actions [Member] | WEST VIRGINIA AND OHIO [Domain] | Loss of consortium [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 10,000,000
PFOA Matters: Multi-District Litigation [Member]
Loss Contingencies [Line Items]
Disease Categories for MDL	6
Lawsuits alleging personal injury filed | lawsuits		3,550
Litigation Settlement, Amount Awarded to Other Party		$ 670,700,000
Chemours [Member] | PFOA Matters [Member]
Loss Contingencies [Line Items]
Indemnification Asset for liabilities indemnified by Chemours	$ 16,000,000
Indemnified Liabilities for liabilities indemnified by Chemours	$ 21,000,000