Note 7 - Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 62	$ 60	$ 53
Operating cash flows from finance leases	2	2	2
Financing cash flows from finance leases	8	9	7
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	61	111	105
Finance leases	$ 5	$ 6	$ 3