Note 21 - Changes in the Company's Benefit Obligation and Funded Status (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Changes in the Company's Benefit Obligation and Funded Status [Line Items]
Projected benefit obligation at beginning of period	$ 63	$ 64
Interest cost	1	2
Plan participants’ contributions	1	1
Actuarial loss	1
Benefit payments	(3)	(4)
Projected benefit obligation at end of period	63	63
Underfunded status at end of period	$ (63)	$ (63)

Changes in the company's benefit obligation and funded status.

No definition available.

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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- Definition

Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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