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Note 21 - Changes in Benefit Obligations Recognized in Other Comprehensive Loss (Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Amortization of:    
Total gain recognized in Other comprehensive income $ 13 $ 12
Other Postretirement Benefits Plan [Member]    
Changes In Benefit Obligations Recognized In Other Comprehensive Loss Income [Line Items]    
Newly established loss 1  
Amortization of:    
Net actuarial gain   1
Total gain recognized in Other comprehensive income $ 1 $ 1