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Note 16 - Share Repurchase Programs (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Share Repurchase Program [Table Text Block] |
| Number of Shares Purchased | Average Price Paid [a] |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
First quarter [b] |  |  | 11,014,201 |  |  |  | 6,691,421 |  |  | $ | 249.95 |  |  | $ | 209.50 |
Second quarter [c] |  |  | 3,100,683 |  |  |  | 12,204,409 |  |  |  | 232.87 |  |  |  | 222.46 |
Third quarter [d] |  |  | 9,490,339 |  |  |  | 8,604,239 |  |  |  | 221.52 |  |  |  | 210.31 |
Total |  |  | 23,605,223 |  |  |  | 27,500,069 |  |  | $ | 236.28 |  |  | $ | 215.51 |
Remaining number of shares that may be repurchased under current authority | 87,408,978 |

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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_
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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