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Note 6 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Gain on non-operating asset dispositions [a] | [1] | $ 98 | $ 63 | $ 114 | $ 72
Rental income |  | 39 | 34 | 75 | 67
Net periodic pension costs |  | 21 | 6 | 41 | 11
Environmental remediation and restoration |  | (5) | (5) | (31) | (9)
Other |  | 10 | 27 | 11 | 35
Total |  | $ 163 | $ 125 | $ 210 | $ 176
[1] | 2022 includes a $79 million gain from a land sale to the Illinois State Toll Highway Authority. 2021 includes a $50 million gain from a sale to the Colorado Department of Transportation.

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- Definition Represents non-operating environmental income. + References No definition available. + Details
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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 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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