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Note 5 - Other Income (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Profit (Loss) from Real Estate Operations | [1] | $ 90 | $ 103 | $ 335 | $ 309
Real Estate Transaction [Member] |  |  |  |  |
Profit (Loss) from Real Estate Operations |  |  |  | $ 107 |
Land [Member] | Colorado Department of Transportation [Member] |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  | $ 35 |  |
Land [Member] | Illinois State Toll Highway Authority [Member] |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  |  | $ 79
[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 Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-3 + 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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