Note 5 - Retirement Plans - Accumulated Benefit Obligation (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Projected benefit obligation | $ 404 | $ 394 |
| Accumulated benefit obligation | 399 | 382 |
| Fair value of plan assets | 0 | 0 |
| Underfunded accumulated benefit obligation | $ (399) | $ (382) |
| X | ||||||||||
- Definition Represents underfunded accumulated benefit obligation. No definition available.
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| X | ||||||||||
- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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