Note 7 - Leases - Maturities (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Leases, 2021	$ 50
Finance Leases, 2021	9
Operating Leases, 2022	41
Finance Leases, 2022	9
Operating Leases, 2023	29
Finance Leases, 2023	8
Operating Leases, 2024	24
Finance Leases, 2024	6
Operating Leases, 2025	21
Finance Leases, 2025	5
Operating Leases, Thereafter	61
Finance Leases, Thereafter	49
Operating Leases, Total lease payments	226
Finance Leases, Total lease payments	86
Operating Leases, Less: interest	30
Finance Leases, Less: interest	26
Operating Leases, Present value of lease liabilities	196
Finance Leases, Present value of lease liabilities	$ 60