Note 19 - Summary of U.S. Defined Benefit Pension Plan Investments in Hedge Funds by Type for Those Investments Values at NAV (Details) - U.S. [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 3,447	$ 3,058
Multi-Strategy Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 653	$ 530
Redemption Frequency	Monthly, Quarterly	Monthly, Quarterly
Multi-Strategy Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	15 days	15 days
Multi-Strategy Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	90 days	90 days
Relative Value Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 354	$ 312
Redemption Frequency	Bi-monthly, Quarterly	Bi-monthly, Quarterly
Relative Value Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	6 days	6 days
Relative Value Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	365 days	365 days
Directional Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 260	$ 222
Redemption Frequency	Bi-monthly, Quarterly	Bi-monthly, Quarterly
Directional Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	5 days	5 days
Directional Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	30 days	30 days
Equity Long/Short Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 225	$ 207
Redemption Frequency	Quarterly	Quarterly
Equity Long/Short Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	45 days	45 days
Equity Long/Short Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	90 days	90 days
Sector Specialist Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 107
Redemption Frequency	Quarterly
Redemption Notice Period	90 days
Long-Biased Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 138	$ 121
Redemption Frequency	Quarterly, Annually	Quarterly, Annually
Long-Biased Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	60 days	60 days
Long-Biased Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	75 days	75 days
Event Driven Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 64	$ 93
Redemption Frequency	Quarterly	Quarterly
Redemption Notice Period	90 days	90 days
Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Net Asset Value	$ 1,801	$ 1,485
Redemption Frequency	Bi-Monthly, Monthly, Quarterly, Semi-Annual, and Annual	Bi-Monthly, Monthly, Quarterly, Semi-Annual, and Annual
Hedge Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	5 days	5 days
Hedge Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	365 days	365 days

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 35
-Paragraph 54B
-URI http://asc.fasb.org/extlink&oid=122636397&loc=SL7495116-110257

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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