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Note 6 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Rental income		$ 136	$ 123	$ 124
Gain on non-operating asset dispositions [a]	[1]	98	115	20
Gain from sale of investment		36	0	0
Net periodic pension costs		25	41	46
Interest income		5	12	32
Interest income on employment tax refund		0	0	31
Other		(3)	(4)	(10)
Total		$ 297	$ 287	$ 243
[1] 2021 includes a $50 million gain from a sale to the Colorado Department of Transportation. 2020 includes a $69 million gain from a land and permanent easement sale to the Illinois State Toll Highway Authority.

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The amount of interest income due to employment tax refund.

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The amount of income (expense) from other nonoperating activities not otherwise specified.

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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Amount of income (expense) related to nonoperating activities, classified as other.

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