Note 19 - Summary of Total Fair Value, Unfunded Commitments and Redemption Provisions for U.S. Defined Benefit Pension Plan's Investments (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]
Fair Value	$ 3,447	$ 3,058
Unfunded Commitments	288	268
Global Equity Securities Fund [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 201	$ 254
Redemption Frequency	Monthly, Quarterly	Monthly, Quarterly
Global Equity Securities Fund [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	6 days	6 days
Global Equity Securities Fund [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	90 days	90 days
Real Estate [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 36	$ 37
Redemption Frequency	N/A	N/A
Global Balanced Asset Allocation Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 327	$ 514
Redemption Frequency	Monthly	Monthly
Global Balanced Asset Allocation Funds [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	6 days	6 days
Global Balanced Asset Allocation Funds [Member] \| Maximum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period	15 days	15 days
Private Equity [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 1,082	$ 768
Unfunded Commitments	$ 262	$ 268
Redemption Frequency	N/A	N/A
Hedge Funds [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 1,801	$ 1,485
Unfunded Commitments	$ 26
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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- Definition

States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

+ 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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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=SL6742756-110258

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