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Note 6 - Other Income (Details Textual) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Profit (Loss) from Real Estate Operations	[1]	$ 57	$ 69	$ 122	$ 245
Real Estate Transaction [Member]
Profit (Loss) from Real Estate Operations					$ 107
[1] The six-months ended June 30, 2023, includes a one-time $107 million transaction.

X

- 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/1943274/2147478524/942-220-S99-1

+ Details

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

X

- Details

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