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Note 15 - Commitments and Contingencies (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Sites Identified	350
Sites Subject of Actions Taken by US Government	31
Sites on Superfund National Priorities List	19
Personal Injury [Member]
Recorded Liability Related to Asserted Claims	92.00%
Recorded Liability Related to Unasserted Claims	8.00%
Personal Injury [Member] | Minimum [Member]
Loss Contingency, Estimate of Possible Loss	$ 387
Personal Injury [Member] | Maximum [Member]
Loss Contingency, Estimate of Possible Loss	$ 502

X

- Definition

Information on the percentage of recorded liability that relates to asserted claims.

+ References

No definition available.

+ Details

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X

- Definition

Information on the percentage of recorded liability that relates to un-asserted claims.

+ References

No definition available.

+ Details

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X

- Definition

Sites identified at which Railroad is or may be liable for remediation costs associated with alleged contamination or for violations of environmental requirements.

+ References

No definition available.

+ Details

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X

- Definition

Sites on the Superfund National Priorities List.

+ References

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X

- Definition

Sites subject of actions taken by the U.S. government.

+ References

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X

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483359/720-20-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-2

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