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Pending Acquisition (Tables) | 9 Months Ended
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Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Schedule of Acquisition-Related Expense Associated with the Merger Agreement | Union Pacific incurred the following acquisition-related expense associated with the merger agreement:
Millions | Three months ended September 30, 2025 |  |  | Nine months ended September 30, 2025 |
Acquisition-related expense |  |  |  |  |
Purchased services and materials | $ | 40 |  |  |  | $ | 41 |  |
Other | 1 |  |  |  | 1 |  |
Total acquisition-related expense [a] | $ | 41 |  |  |  | $ | 42 |  |
[a]Certain acquisition-related costs are non-deductible for income tax purposes.

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- Definition Tabular disclosure of transaction recognized separately from acquisition of asset and assumption of liability in business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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