Note 6 - Leases - Components of Lease Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating lease cost	[1]	$ 147	$ 139	$ 133
Variable lease cost		51	59	41
Short-term lease cost		2	2	4
Total lease cost		200	200	178
Operating cash outflows from operating leases	[2]	$ 116	$ 134	$ 121

[1] Finance lease costs were not material for the years ended December 31, 2022, 2021 and 2020.

[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, 2022, 2021 and 2020.