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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Expense (Benefit), Total | $ 34 |  | $ (52) |  | $ 18 | $ (32)
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  |  | (14.00%) | 291.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  | (30) |  |  |
Goodwill, Impairment Loss |  | $ 51 |  |  | $ 51 |
Other Tax Expense (Benefit) |  | 1 | 9 |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | 37 | 48 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | $ (258) |  |  | $ (258)
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  | $ 6 |  |
Effective Income Tax Rate Reconciliation, Excluding Effects of Special Items, Percent |  |  |  |  | 8.00% | 29.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |
Foreign Tax Authority [Member] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 56 | 4 |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | $ 2 |  | $ (22) |  |

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