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Note 7 - Leases - Summary of Location and Amounts Related to Finance Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment, Net, Ending Balance    
Finance lease right-of-use assets $ 63 $ 72
Current Portion of Long-term Debt [Member]    
Finance lease liabilities 8 7
Long-term Debt, Excluding Current Portion [Member]    
Finance lease liabilities $ 47 $ 53