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Note 20 - Changes in the Company's Benefit Obligation and Funded Status (Details) - Other Postretirement Benefits Plan [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in the Company's Benefit Obligation and Funded Status [Line Items]      
Projected benefit obligation at beginning of period $ 63 $ 63  
Interest cost 1 1 $ 2
Plan participants’ contributions 1 1  
Actuarial (gain) loss (6) 1  
Benefit payments (3) (3)  
Projected benefit obligation at end of period 56 63 $ 63
Underfunded status at end of period $ (56) $ (63)