Commitments and Contingent Liabilities Litigation - Leach and MDL Settlement (Details)	3 Months Ended	12 Months Ended	96 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2004 USD ($)	Dec. 31, 2019 USD ($) lawsuits	Jan. 01, 2012
Loss Contingencies [Line Items]
Indemnification Assets			$ 202,000,000
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: Multi-District Litigation [Member]
Loss Contingencies [Line Items]
Disease Categories for MDL			6
Lawsuits alleging personal injury filed | lawsuits			3,550
Litigation Settlement Amount	$ 670,700,000
Personal injury cases [Member] | Firefighting Foam [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			180
NEW YORK | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			50
WEST VIRGINIA AND OHIO [Domain] | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			55
NEW JERSEY | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			2
NEW JERSEY | Natural Resources Damages [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			4
OHIO | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number			3
Chemours [Member] | PFOA Matters [Member]
Loss Contingencies [Line Items]
Indemnified Liabilities			$ 20,000,000
Indemnification Assets			$ 20,000,000