XML 65 R42.htm IDEA: XBRL DOCUMENT
v3.22.4

Note 17 - Commitments and Contingencies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |  |  | 2020 |
Beginning balance |  | $ | 243 |  |  | $ | 233 |  |  | $ | 227 |
Accruals |  |  | 84 |  |  |  | 69 |  |  |  | 76 |
Payments |  |  | (74 | ) |  |  | (59 | ) |  |  | (70 | )
Ending balance at December 31 |  | $ | 253 |  |  | $ | 243 |  |  | $ | 233 |
Current portion, ending balance at December 31 |  | $ | 67 |  |  | $ | 60 |  |  | $ | 65 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |  |  | 2020 |
Beginning balance |  | $ | 325 |  |  | $ | 270 |  |  | $ | 265 |
Current year accruals |  |  | 107 |  |  |  | 93 |  |  |  | 72 |
Changes in estimates for prior years |  |  | 55 |  |  |  | 48 |  |  |  | (3 | )
Payments |  |  | (126 | ) |  |  | (86 | ) |  |  | (64 | )
Ending balance at December 31 |  | $ | 361 |  |  | $ | 325 |  |  | $ | 270 |
Current portion, ending balance at December 31 |  | $ | 84 |  |  | $ | 64 |  |  | $ | 60 |

X
- Definition Tabular disclosure of the environmental loss contingencies that were reported in the period or disclosed as of the balance sheet date. + References No definition available. + Details
Name: | unp_ScheduleOfLossContingenciesByContingencyEnvironmentalTableTextBlock
Namespace Prefix: | unp_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12053-110248 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 + Details
Name: | us-gaap_ScheduleOfLossContingenciesByContingencyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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