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Note 5 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Real estate income [a] | [1] | $ 90 | $ 103 | $ 335 | $ 309
Net periodic pension benefit/(costs) |  | 12 | 22 | 40 | 63
Environmental remediation and restoration |  | (9) | (4) | (31) | (35)
Other |  | 13 | 3 | 39 | (3)
Total |  | $ 106 | $ 124 | $ 383 | $ 334
[1] | The three months ended September 30, 2022, includes a $35 million gain from a sale to the Colorado Department of Transportation. The nine months ended September 30, 2023, includes a one-time $107 million transaction. The nine months ended September 30, 2022, also includes a $79 million gain from a land sale to the Illinois State Toll Highway Authority.

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- Definition The amount of income (expense) from other nonoperating activities not otherwise specified. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A + Details
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition The net cost of operation of other real estate (including provisions for real estate losses, rental income, and gains and losses on sales of real estate). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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