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Commitments and Contingent Liabilities PFOA / Leach Settlement (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 105 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Sep. 30, 2020 USD ($) lawsuits | Dec. 31, 2004 USD ($) | Sep. 30, 2020 USD ($) lawsuits | Jan. 01, 2012
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 |  | 58 |  | 58 |
Loss Contingency, Threatened Claims, Number |  | 33 |  | 33 |
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] |  |  |  |  |
Indemnification Asset for liabilities indemnified by Chemours |  | $ 21,000,000 |  | $ 21,000,000 |
Indemnified Liabilities for liabilities indemnified by Chemours |  | $ 21,000,000 |  | $ 21,000,000 |

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