Note 5 - Leases - Components of Lease Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating lease cost		$ 171	$ 147	$ 139
Variable lease cost		57	51	59
Short-term lease cost		2	2	2
Total lease cost	[1]	230	200	200
Operating cash outflows from operating leases	[2]	$ 153	$ 116	$ 134

[1] Finance lease costs were not material for the years ended December 31, 2023, 2022 and 2021.

[2] Cash payments for operating leases have been classified as operating activities on the consolidated statements of cash flows. Principal and interest payments for finance leases have been classified as financing activities and operating activities, respectively, on the consolidated statements of cash flows, and were not material for the years ended December 31, 2023, 2022 and 2021.