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Note 11 - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows for operating leases $ 22 $ 25
Financing cash flow for finance leases 1 2
Cash paid for amounts included in measurement of lease liabilities $ 23 $ 27