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Stock Split (Details) (USD $)
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0 Months Ended | 12 Months Ended | |
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May 27, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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| Stock Split [Abstract] | |||
| Stock split effective date | Jun. 06, 2014 | ||
| Stock split conversion ratio | 2us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 | ||
| Percent of dividend in stock | 100.00%unp_PercentOfDividendInStock | ||
| Stock split record date | May 27, 2014 | ||
| Common shares, par value | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare |
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- Definition
Percent of dividend in stock. No definition available.
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- Details
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- Definition
Effective date of the stock split. No definition available.
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- Definition
Date for which shareholders of record at the close of business are eligible for the stock split. No definition available.
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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