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(Litigation) (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2004 USD ($) resident | Sep. 30, 2017 USD ($) | Jan. 01, 2012 USD ($) water_district
PFOA Matters [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual balance |  |  | $ 15.0 |
Indemnification assets |  |  | 15.0 |
Period for sharing for PFOA Liabilities | 5 years |  |  |
Limited Sharing Of Potential Future Liabilities, Maximum Annual Liability Threshold, paid by DuPont | $ 25.0 |  |  |
PFOA Matters [Member] | Chemours [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Additional annual PFOA liabilities for the next five years paid by Chemours | 25.0 |  |  |
PFOA Matters: Drinking Water Actions [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Binding settlement agreement, class size | resident |  | 80,000 |  |
Liability For Medical Monitoring Program, Threshold |  | $ 235.0 |  |
Escrow deposit |  |  |  | $ 1.0
Escrow amount disbursed (less than) |  |  | $ 1.0 |
Number Of Water Districts Receiving Water Treatment | water_district |  |  |  | 6
PFOA Matters: Drinking Water Actions [Member] | Payment for Plaintiffs Attorney Fees [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation Settlement, Expense |  | 23.0 |  |
PFOA Matters: Drinking Water Actions [Member] | Payment to fund community health project [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement payments |  | $ 70.0 |  |
PFOA Matters: Multi-District Litigation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Lawsuits alleging personal injury |  |  | 3,550 |
MDL Settlement Amount | $ 670.7 |  |  |
PFOA Matters [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual balance |  |  | $ 15.0 |

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