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Note 21 - Amounts Recognized in the Consolidated Statement of Financial Position (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]    
Pension and other postretirement liabilities $ (406) $ (378)
Other Postretirement Benefits Plan [Member]    
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]    
Other current liabilities (3) (3)
Pension and other postretirement liabilities (60) (60)
Other benefit plan liabilities $ (63) $ (63)