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Leases (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Future Minimum Lease Payments For Capital Leases [Abstract] | |||
| Minimum capital lease payments - 2015 | $ 253us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent | ||
| Minimum capital lease payments - 2016 | 249us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears | ||
| Minimum capital lease payments - 2017 | 246us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears | ||
| Minimum capital lease payments - 2018 | 224us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears | ||
| Minimum capital lease payments - 2019 | 210us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears | ||
| Minimum capital lease payments - later years | 745us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter | ||
| Total minimum capital lease payments | 1,927us-gaap_CapitalLeasesFutureMinimumPaymentsDue | ||
| Capital lease payments - amount representing interest | (407)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments | ||
| Capital lease payments - present value of minimum lease payments | 1,520us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments | ||
| Properties held under capital leases | 2,454us-gaap_CapitalLeasedAssetsGross | 2,486us-gaap_CapitalLeasedAssetsGross | |
| Properties held under capital leases - accumulated depreciation | 1,210us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | 1,092us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | |
| Lease payments related to locomotives | 95.00%unp_CapitalLeasesFutureMinimumPaymentsDueLocomotives | ||
| Future Minimum Lease Payments For Operating Leases [Abstract] | |||
| Minimum operating lease payments - 2015 | 508us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent | ||
| Minimum operating lease payments - 2016 | 484us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears | ||
| Minimum operating lease payments - 2017 | 429us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears | ||
| Minimum operating lease payments - 2018 | 356us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears | ||
| Minimum operating lease payments - 2019 | 323us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears | ||
| Minimum operating lease payments - later years | 1,625us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter | ||
| Total minimum operating lease payments | 3,725us-gaap_OperatingLeasesFutureMinimumPaymentsDue | ||
| Rent expense for operating leases with terms exceeding one month | $ 593unp_RentExpenseForOperatingLeases | $ 618unp_RentExpenseForOperatingLeases | $ 631unp_RentExpenseForOperatingLeases |
| X | ||||||||||
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- Definition
Percent of capital lease payments related to locomotives. No definition available.
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- Definition
Rent expense for operating leases with terms exceeding one month. No definition available.
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- Definition
Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount necessary to reduce net minimum lease payments to present value for capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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