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Note 5 - Other Income (Details Textual) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Profit (Loss) from Real Estate Operations | [1],[2] | $ 176 | $ 60
Real Estate Transaction [Member] |  |  |
Profit (Loss) from Real Estate Operations |  | $ 107 |
[1] | 2023 includes a one-time $107 million transaction.
[2] | Prior periods have been reclassified to conform to the current period disclosure.

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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
Name: | us-gaap_ProfitLossFromRealEstateOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=unp_RealEstateTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |