Note 20 - Retirement Plans - (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Retirement Plans [Line Items]
Defined Benefit Plan, Special Termination Benefits	$ 3	$ 3
U.S. [Member]
Retirement Plans [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.20%
U.S. [Member] \| Equity Securities Exposure Obtained Through Derivatives [Member]
Retirement Plans [Line Items]
Percentage of securities exposure obtained through derivatives	4.00%	4.00%
U.S. [Member] \| Government Bond Exposure Obtained Through Derivatives [Member]
Retirement Plans [Line Items]
Percentage of securities exposure obtained through derivatives	29.00%	30.00%
Duration of securities exposure obtained through derivatives	11 years	12 years
Non-US [Member] \| Government Bond Exposure Obtained Through Derivatives [Member]
Retirement Plans [Line Items]
Percentage of securities exposure obtained through derivatives	0.00%	7.00%
Duration of securities exposure obtained through derivatives		2 years
Cash Balance Plan [Member]
Retirement Plans [Line Items]
Defined Benefit Plan Contributions By Employer Minimum Percentage Of Employee Salary	9.00%	7.00%
Defined Benefit Plan Contributions By Employer Maximum Percentage Of Employee Salary	10.00%	8.00%
Defined benefit plan, Settlement amount	$ 121
Settlement losses	9
Defined Benefit Plans [Member] \| U.S. [Member]
Retirement Plans [Line Items]
Defined benefit plan, Settlement amount	121
Curtailment gains		$ 2
Settlement losses	9
Defined Benefit Plan, Special Termination Benefits	$ 3	$ 3
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.00%	6.50%
Defined Benefit Plans [Member] \| Non-US [Member]
Retirement Plans [Line Items]
Curtailment gains		$ 5
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	3.27%	3.46%

The maximum percentage of employee's salary plus interest contributed to employee retirement account by the employer.

No definition available.

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- Definition

The minimum percentage of employee's salary plus interest contributed to employee retirement account by the employer.

+ References

No definition available.

+ Details

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- Definition

Duration of securities exposure obtained through derivatives.

+ References

No definition available.

+ Details

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- Definition

Percentage of securities exposure obtained through derivatives.

+ References

No definition available.

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- Definition

Retirement plans.

+ References

No definition available.

+ Details

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- Definition

Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (r)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

+ Details

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- Definition

Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Period Type:	duration

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

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- Definition

Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

+ References

+ Details

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- Details

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- Details

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- Details

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