XML 119 R95.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Note 17 - Commitments and Contingencies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Sites Identified | 376
Sites Subject of Actions Taken by US Government | 28
Sites on Superfund National Priorities List | 18
Personal Injury [Member] |
Recorded Liability Related to Asserted Claims | 94.00%
Recorded Liability Related to Unasserted Claims | 6.00%
Personal Injury [Member] | Minimum [Member] |
Loss Contingency, Estimate of Possible Loss | $ 325
Personal Injury [Member] | Maximum [Member] |
Loss Contingency, Estimate of Possible Loss | $ 358

X
- Definition Information on the percentage of recorded liability that relates to asserted claims. + References No definition available. + Details
Name: | unp_RecordedLiabilityRelatedToAssertedClaims
Namespace Prefix: | unp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Information on the percentage of recorded liability that relates to un-asserted claims. + References No definition available. + Details
Name: | unp_RecordedLiabilityRelatedToUnassertedClaims
Namespace Prefix: | unp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sites identified at which Railroad is or may be liable for remediation costs associated with alleged contamination or for violations of environmental requirements. + References No definition available. + Details
Name: | unp_SitesIdentified
Namespace Prefix: | unp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sites on the Superfund National Priorities List. + References No definition available. + Details
Name: | unp_SitesOnSuperfundNationalPrioritiesList
Namespace Prefix: | unp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sites subject of actions taken by the U.S. government. + References No definition available. + Details
Name: | unp_SitesSubjectOfActionsTakenByUSGovernment
Namespace Prefix: | unp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=unp_PersonalInjuryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |