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Note 11 - Pension and Postretirement Benefit Plans - Fair Value of Pension Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair value of plan assets |  | $ 554 |  | $ 599 |  |
UNITED STATES |  |  |  |  |  |
Fair value of plan assets |  | 493 |  | 530 |  | $ 537
UNITED STATES | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 25 |  | 25 |  |
UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 230 |  | 241 |  |
UNITED STATES | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 5 |  | 6 |  |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 233 |  | 258 |  |
Foreign Plan [Member] |  |  |  |  |  |
Fair value of plan assets |  | 61 |  | 69 |  | 59
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 0 |  |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 16 |  | 21 |  |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 45 |  | 48 |  |
Defined Benefit Plan, Equity Securities, US [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 25 |  | 25 |  |
Defined Benefit Plan, Equity Securities, US [Member] | UNITED STATES | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 25 |  | 25 |  |
Defined Benefit Plan, Equity Securities, US [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US [Member] | UNITED STATES | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1],[2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Defined Benefit Plan, Equity Securities, US, Large Cap [Member] |  |  |  |  |  |
Fair value of plan assets |  | 26 |  | 26 |  |
Defined Benefit Plan, Equity Securities, US, Large Cap [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 26 |  | 26 |  |
Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |  |  |  |
Fair value of plan assets |  | 12 |  | 14 |  |
Defined Benefit Plan, Equity Securities, Non-US [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 12 |  | 14 |  |
Defined Benefit Plan, Equity Securities, Emerging Markets [Member] |  |  |  |  |  |
Fair value of plan assets |  | 9 |  | 10 |  |
Defined Benefit Plan, Equity Securities, Emerging Markets [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 9 |  | 10 |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Fair value of plan assets |  | 345 |  | 379 |  |
Corporate Debt Securities [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 177 |  | 190 |  |
Corporate Debt Securities [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 168 |  | 189 |  |
US Treasury Securities [Member] |  |  |  |  |  |
Fair value of plan assets |  | 11 |  | 7 |  |
US Treasury Securities [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 11 |  | 7 |  |
Debt Security, Government, Non-US [Member] |  |  |  |  |  |
Fair value of plan assets |  | 16 |  | 19 |  |
Debt Security, Government, Non-US [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 3 |  | 2 |  |
Debt Security, Government, Non-US [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 13 |  | 17 |  |
Defined Benefit Plan, Fixed Income Securities, Emerging Markets [Member] |  |  |  |  |  |
Fair value of plan assets |  | 7 |  | 8 |  |
Defined Benefit Plan, Fixed Income Securities, Emerging Markets [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 7 |  | 8 |  |
Collateralized Mortgage Obligations [Member] |  |  |  |  |  |
Fair value of plan assets |  | 9 |  |  |  |
Collateralized Mortgage Obligations [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 9 |  |  |  |
Insurance Contracts [Member] |  |  |  |  |  |
Fair value of plan assets | [3] | 50 |  | 54 |  |
Insurance Contracts [Member] | UNITED STATES | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 5 | [3] | 6 | [3] | 6
Insurance Contracts [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 45 | [3] | 48 | [3] | $ 43
Employee Benefit Plan, Real Estate [Member] |  |  |  |  |  |
Fair value of plan assets |  | 11 |  | 11 |  |
Employee Benefit Plan, Real Estate [Member] | UNITED STATES | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair value of plan assets | [1] | 11 |  | 11 |  |
Other Securities [Member] |  |  |  |  |  |
Fair value of plan assets |  | 3 |  | 4 |  |
Other Securities [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | 3 |  | 4 |  |
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |  |  |  |
Fair value of plan assets |  | 30 |  | 42 |  |
Defined Benefit Plan, Cash and Cash Equivalents [Member] | UNITED STATES | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair value of plan assets |  | $ 30 |  | $ 42 |  |
[1] | Certain assets are measured at fair value using the net asset value (NAV) per share (or its equivalent) practical expedient and have not been classified in the fair value hierarchy.
[2] | This category comprises a combination of small-, mid- and large-cap equity stocks that are allocated at the investment manager's discretion. Investments include common and preferred securities as well as equity funds that invest in these instruments.
[3] | This category comprises contracts placed with insurance companies where the underlying assets are invested in fixed interest securities.

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