Note 6 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Real estate income [a]	[1]	$ 70	$ 90	$ 192	$ 335
Net periodic pension benefit/(costs)		12	12	42	40
Interest from IRS refund claims		0	0	24	0
Non-operating property environmental remediation and restoration		(7)	(9)	(21)	(31)
Other		12	13	45	39
Total		$ 87	$ 106	$ 282	$ 383

[1] The nine months ended September 30, 2023, includes a one-time $107 million transaction.