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Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2005 USD ($) | Jun. 30, 2017 USD ($) yr | Jun. 30, 2017 USD ($) yr | Dec. 31, 2004 resident | Mar. 31, 2017 USD ($) | Jan. 31, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency accrual, period decrease |  | $ 30.0 |  |  |  |
Indemnification asset period decrease |  | 15.0 |  |  |  |
PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Binding settlement agreement, class size | resident |  |  |  | 80,000 |  |
Loss contingency, potential additional loss |  | 235.0 | $ 235.0 |  |  |
Escrow deposit |  |  |  |  |  | $ 1.0
Minimum escrow amount per settlement agreement |  |  |  |  |  | $ 0.5
Escrow amount disbursed (less than) |  | 1.0 | 1.0 |  |  |
PFOA Matters [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual balance |  | 656.0 | 656.0 |  |  |
Indemnification assets |  | 335.0 | 335.0 |  |  |
PFOA Matters: Multi-District Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
MDL Settlement Amount |  |  |  |  | $ 670.7 |
Accrual balance |  | 640.7 | 640.7 |  | 670.7 |
Indemnification assets |  | $ 320.0 | $ 320.0 |  | $ 335.0 |
Disease Categories for MDL |  | 6 | 6 |  |  |
Lawsuits alleging personal injury - Filed |  | 3,550 | 3,550 |  |  |
Lawsuits alleging wrongful death |  | 30 | 30 |  |  |
Loss Contingency, Loss in Period |  |  | $ 335.0 |  |  |
Loss Contingency, Loss in Period, after tax |  |  | $ 214.0 |  |  |
Payment for Plaintiffs Attorney Fees [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement payments | $ 23.0 |  |  |  |  |
Payment to fund community health project [Member] | PFOA Matters: Drinking Water Actions [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement payments | $ 70.0 |  |  |  |  |
Scenario, Forecast [Member] | PFOA Matters [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Period for sharing for PFOA Liabilities | yr |  | 5 | 5 |  |  |
Additional annual PFOA liabilities for the next five years paid by Chemours |  | $ 25.0 | $ 25.0 |  |  |
Additional annual PFOA liabilities for the next five years paid by DuPont |  | 25.0 | 25.0 |  |  |
PFOA Matters [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual balance |  | $ 15.0 | $ 15.0 |  |  |

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