Note 8 - Debt and Credit Facilities - Schedule of Maturities of Debt and Finance Leases Outstanding (Details) $ in Millions	Dec. 31, 2024 USD ($)
2025, Carrying value	$ 1
2025, Maturity value	1
2026, Carrying value	1
2026, Maturity value	1
2027, Carrying value	2
2027, Maturity value	2
2028, Carrying value	456
2028, Maturity value	561
2029, Carrying value	1
2029, Maturity value	1
2030 and thereafter, Carrying value	6
2030 and thereafter, Maturity value	6
Total, Carrying value	467
Total, Maturity value	$ 572