Note 19 - Employee Benefit Plans - Reconciliation of Balances at Fair Value Using Unobservable Inputs (Details) - Pension Plan [Member] - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Balance at beginning of period | $ 2,800 | |
| Balance at end of period | 3,100 | $ 2,800 |
| Real Estate and Other [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Balance at beginning of period | 124 | 121 |
| Return on pension plan assets | 5 | 4 |
| Purchases, sales and settlements | (2) | (1) |
| Transfers into (out of) Level 3 | 11 | 0 |
| Balance at end of period | $ 138 | $ 124 |
| X | ||||||||||
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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