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Note 11 - Retirement Plans - Components of Net Periodic Benefit Cost for Pension Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest cost $ 5 $ 5 $ 5
Expected return on plan assets (5) (6) (6)
Recognized net actuarial loss 0 0 1
Net periodic pension benefit $ 0 $ (1) $ 0