Commitments and Contingent Liabilities PFOA / Leach Settlement (Details)	3 Months Ended		12 Months Ended	99 Months Ended
	Mar. 31, 2020 USD ($) lawsuits	Mar. 31, 2017 USD ($)	Dec. 31, 2004 USD ($)	Mar. 31, 2020 USD ($) lawsuits	Jan. 01, 2012
Loss Contingencies [Line Items]
Indemnification Assets	$ 198,000,000			$ 198,000,000
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			$ 1,000,000
PFOA Matters: Drinking Water Actions [Member] | WEST VIRGINIA AND OHIO [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	60			60
PFOA Matters: Drinking Water Actions [Member] | WEST VIRGINIA AND OHIO [Domain] | Scheduled for trial [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	6			6
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			6
Lawsuits alleging personal injury filed | lawsuits	3,550			3,550
Litigation Settlement, Amount Awarded to Other Party		$ 670,700,000
Chemours [Member] | PFOA Matters [Member]
Loss Contingencies [Line Items]
Indemnified Liabilities	$ 20,000,000			$ 20,000,000
Indemnification Assets	$ 20,000,000			$ 20,000,000