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Note 9 - Commitments and Contingencies (Details Textual) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2016 | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 01, 2016
Environmental Litigation [Member] |  |  |  |
Number of Hazardous Waste Sites |  | 19 |  |
Accrual for Environmental Loss Contingencies |  | $ 94 | $ 109 |
Dow Corning Corporation [Member] | Dow Corning Chapter 11 Related Matters [Member] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00%
Indemnification of Excess Liability | 50.00% |  |  |
Dow Corning Corporation [Member] | Dow Corning Environmental Claims [Member] |  |  |  |
Indemnification of Excess Liability |  | 50.00% |  |

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