Note 12 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Payment for Pension and Other Postretirement Benefits, Total | $ 14 | $ 20 |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 42 | |
| X | ||||||||||
- Definition Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|