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Note 12 - Accounts Payable and Other Current Liabilities (Details Textual) $ in Millions	Sep. 30, 2022 USD ($)
Tentative Agreements with Labor Unions [Member]
Employee-related Liabilities, Current, Total	$ 114

X

- Definition

Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_EmployeeRelatedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CollectiveBargainingArrangementAxis=unp_TentativeAgreementsWithLaborUnionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: