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Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) $ in Millions | 1 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2005 USD ($) | Nov. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2004 resident | Mar. 31, 2016 USD ($) | Oct. 07, 2015 USD ($) | Jan. 31, 2012 USD ($)
PFOA Matters [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual balance |  |  |  |  | $ 14.0 |  |
Indemnification assets |  |  |  |  | 14.0 |  |
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 |  |
Escrow deposit |  |  |  |  |  |  | $ 1.0
Minimum escrow amount per settlement agreement |  |  |  |  |  |  | $ 0.5
Escrow amount disbursed (less than) |  |  |  |  | $ 1.0 |  |
PFOA Matters: Additional Actions [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Lawsuits alleging personal injury - Filed |  |  |  |  | 3,500 |  |
Portion of lawsuits alleging personal injury claims associated only with high cholesterol and/or thyroid disease |  |  |  |  | 75.00% |  |
Lawsuits alleging wrongful death |  |  |  |  | 30 |  |
PFOA MDL plaintiffs |  |  |  |  | 6 |  |
Compensatory damages awarded |  |  |  |  |  | $ 1.6 |
Portion of pending lawsuits claiming that exposure to PFOA in drinking water caused cancer (less than) |  |  |  |  | 10.00% |  |
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: Additional Actions [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of cases for trial in 2016 |  | 3 |  |  |  |  |
Number of cases for trial in 2017 |  |  | 40 |  |  |  |

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- Definition Compensatory damages awarded by a jury in the first individual trial involving a plaintiff who alleged that exposure to C8 had caused the plaintiff's kidney cancer. + References No definition available. + Details
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