Note 9 - Stock Compensation (Details Textual) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid			$ 1
Share-based Payment Arrangement, Expense	$ 2	$ 5	5	$ 15
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 20		$ 20
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			1 year 10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)			0.5
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)			0.3

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash paid to settle liability for award under share-based payment arrangement.

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Number of shares issued under share-based payment arrangement.

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