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Note 11 - Stock Compensation - Total Stock Compensation Expense and Other Annual Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock compensation expense $ 14 $ 19 $ 16
Total grant-date fair value of awards vested 16 16 16
Cash received from exercise of stock options     2
Cash paid to settle SARs and RSUs 2 2 2
Stock Option and Stock Appreciation Rights [Member]      
Intrinsic value of stock options and SARs exercised   1 3
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]      
Intrinsic value of RSUs and PSUs vested $ 14 $ 17 $ 18