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Debt (Equipment Encumbrances) (Narrative) (Details) - USD ($) $ in Billions	Dec. 31, 2020	Dec. 31, 2019
Debt [Abstract]
Carrying value of equipment serving as collateral for finance leases and other types of equipment obligations	$ 1.3	$ 1.6

X

- Definition

Carrying value of equipment serving as collateral for finance leases and other types of equipment obligations.

+ References

No definition available.

+ Details

Name:	unp_CarryingValueOfEquipmentServingAsCollateralForFinanceLeasesAndOtherTypesOfEquipmentObligations
Namespace Prefix:	unp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration