XML 72 R45.htm IDEA: XBRL DOCUMENT
v3.20.4

Share Repurchase Program (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Share Repurchase Program [Abstract] |
Share Repurchase Program | The table below represents shares repurchased under repurchase programs during 2019 and 2020:
| Number of Shares Purchased | Average Price Paid [a]
| 2020 | 2019 |  | 2020 |  | 2019
First quarter [b] | 14,305,793 | 18,149,450 | $ | 178.66 | $ | 165.79
Second quarter | - | 3,732,974 |  | - |  | 171.24
Third quarter [c] | 4,045,575 | 9,529,733 |  | 98.87 |  | 163.30
Fourth quarter | 3,780,743 | 3,582,212 |  | 198.07 |  | 167.32
Total | 22,132,111 | 34,994,369 | $ | 167.39 | $ | 165.85
Remaining number of shares that may be repurchased under current authority | 111,022,970

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

X
- Definition This element is used to disclose the repurchases of common stock through the company's repurchase program. + References No definition available. + Details
Name: | unp_ShareRepurchaseProgramTableTextBlock
Namespace Prefix: | unp_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration