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Note 10 - Pension and Postretirement Benefit Plans (Details Textual) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | $ (258) |  | $ (258) |  |
UNITED STATES | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | (258) |  | (258) |  |
UNITED STATES | Pension Plan [Member] | Terminated Plan [Member] |  |  |  |  |  |  |
Number of Plans Terminated |  |  |  |  |  |  | 1
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 59 |  |  |  |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | $ 165 |  | $ 165 |  | $ 165 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  |  |  |  | $ 256 |

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