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Note 16 - Share Repurchase Programs (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Share Repurchase Program [Table Text Block] |
| Number of Shares Purchased |  |  | Average Price Paid |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
First quarter |  |  | - |  |  |  | 2,908,703 |  |  | $ | - |  |  | $ | 203.19 |
Second quarter |  |  | 492,320 |  |  |  | 606,581 |  |  |  | 225.96 |  |  |  | 199.81 |
Total |  |  | 492,320 |  |  |  | 3,515,284 |  |  | $ | 225.96 |  |  | $ | 202.61 |
Remaining number of shares that may be repurchased under current authority |  |  |  |  |  |  |  |  |  |  |  | 79,899,707 |

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- Definition Tabular disclosure of information related to share repurchase programs. + References No definition available. + Details
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Namespace Prefix: | unp_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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