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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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- 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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