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Note 18 - Share Repurchase Programs (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share Repurchase Program [Table Text Block] |
|  | Number of Shares Purchased |  |  | Average Price Paid [a] |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
First quarter [b] |  |  | 6,691,421 |  |  |  | 14,305,793 |  |  | $ | 209.50 |  |  | $ | 178.66 |
Second quarter [c] |  |  | 12,204,409 |  |  |  | - |  |  |  | 222.46 |  |  |  | - |
Third quarter [d] |  |  | 8,604,239 |  |  |  | 4,045,575 |  |  |  | 210.31 |  |  |  | 98.87 |
Fourth quarter |  |  | 5,837,551 |  |  |  | 3,780,743 |  |  |  | 233.71 |  |  |  | 198.07 |
Total |  |  | 33,337,620 |  |  |  | 22,132,111 |  |  | $ | 218.69 |  |  | $ | 167.39 |
Remaining number of shares that may be repurchased under current authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,685,350 |

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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