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Note 10 - Leases - Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amortization of leased assets $ 1 $ 1 $ 1
Interest on lease liabilities 0 0 0
Operating lease expense 16 17 19
Variable lease expense (1) [1] 7 7 9
Total lease expense $ 24 $ 25 $ 29
[1] Variable lease expense is related to real estate leases and primarily includes taxes, insurance and operating costs.