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Commitments and Contingent Liabilities Litigation (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) lawsuits | Dec. 31, 2017 USD ($) lawsuits | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) lawsuits | Dec. 31, 2004 USD ($) | Jan. 01, 2012
PFOA Matters: Multi-District Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Limited Sharing of Potential Future Liabilities, Period | 5 years |  |  |  |  |
Period for sharing for PFOA liabilities | 5 years |  |  |  |  |
Loss Contingency, Limited Sharing of Potential Future Liabilities, Third-Party Annual Liability Threshold | $ 25,000,000 | $ 25,000,000 |  | $ 25,000,000 |  |
PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Number Of Water Districts Receiving Water Treatment |  |  |  |  |  | 6
PFOA Matters: Multi-District Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Disease Categories for MDL | 6 | 6 |  | 6 |  |
Lawsuits alleging personal injury filed | lawsuits | 3,550 | 3,550 |  | 3,550 |  |
Litigation Settlement, Amount Awarded to Other Party |  |  | $ 670,700,000 |  |  |
Successor [Member] | PFOA Matters: Multi-District Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Indemnification Assets | $ 15,000,000 | $ 15,000,000 |  | $ 15,000,000 |  |
Accrual balance | 15,000,000 | 15,000,000 |  | 15,000,000 |  |
Successor [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Escrow Deposit | $ 1,000,000 | $ 1,000,000 |  | $ 1,000,000 |  |
Predecessor [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Binding Settlement Agreement Class Size |  |  |  |  | 80,000 |
Litigation Settlement, Liability For Medical Monitoring Program, Threshold |  |  |  |  | $ 235,000,000 |
Predecessor [Member] | Payment for Plaintiffs Attorney Fees [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Plaintiffs' attorneys' fees and expenses |  |  |  |  | 23,000,000 |
Predecessor [Member] | Payment to fund community health project [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Payments to fund community health project |  |  |  |  | $ 70,000,000 |
WEST VIRGINIA | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | 5 | 5 |  | 5 |  |
OHIO | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | 4 | 4 |  | 4 |  |
NEW YORK | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs |  |  |  | 5 |  |
Loss Contingency, Pending Claims, Number | 3 | 3 |  | 3 |  |
NORTH CAROLINA | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Pending Claims, Number | 3 | 3 |  | 3 |  |
Loss Contingency, Number of Additional Plaintiffs |  | 2 |  |  |  |
Chemours [Member] | PFOA Matters: Multi-District Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Additional annual PFOA liabilities for the next five years paid by Chemours | $ 25,000,000 | $ 25,000,000 |  | $ 25,000,000 |  |

X
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