Note 6 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Real estate income [a]	[1]	$ 65	$ 176
Net periodic pension benefit/(costs)		15	14
Non-operating property environmental remediation and restoration		(6)	(19)
Other		18	13
Total		$ 92	$ 184

[1] 2023 includes a one-time $107 million transaction.