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Note 20 - Other Postretirement Benefits - Schedule Of Changes In Projected Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest cost $ 2 $ 1 $ 1
Other Postretirement Benefits Plan [Member]      
Net benefit obligation at beginning of period 43 52  
Interest cost 2 1  
Actuarial gain 0 (7)  
Benefit payments (2) (3)  
Net benefit obligation at end of period 43 43 $ 52
Underfunded status at end of period $ (43) $ (43)