XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.24.2

Note 15 - Commitments and Contingencies (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions, for the Six Months Ended June 30, |  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 245 |  |  | $ | 253 |
Accruals |  |  | 78 |  |  |  | 62 |
Payments |  |  | (50 | ) |  |  | (50 | )
Ending balance at June 30, |  | $ | 273 |  |  | $ | 265 |
Current portion, ending balance at June 30, |  | $ | 119 |  |  | $ | 78 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions, for the Six Months Ended June 30, |  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 383 |  |  | $ | 361 |
Current year accruals |  |  | 58 |  |  |  | 52 |
Changes in estimates for prior years |  |  | - |  |  |  | 31 |
Payments |  |  | (54 | ) |  |  | (77 | )
Ending balance at June 30, |  | $ | 387 |  |  | $ | 367 |
Current portion, ending balance at June 30, |  | $ | 109 |  |  | $ | 98 |

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 -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-3 + 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: |