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Income Taxes (Details 1) (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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| Current Income Tax Expense [Abstract] | |||
| Current federal income tax expense | $ 2,029us-gaap_CurrentFederalTaxExpenseBenefit | $ 1,738us-gaap_CurrentFederalTaxExpenseBenefit | $ 1,335us-gaap_CurrentFederalTaxExpenseBenefit |
| Current state income tax expense | 239us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 199us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 153us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
| Total current income tax expense | 2,268us-gaap_CurrentIncomeTaxExpenseBenefit | 1,937us-gaap_CurrentIncomeTaxExpenseBenefit | 1,488us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred Income Tax Expense [Abstract] | |||
| Deferred federal income tax expense | 667us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 659us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 760us-gaap_DeferredFederalIncomeTaxExpenseBenefit |
| Deferred state income tax expense | 136us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 119us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 120us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |
| Total deferred income tax expense | 803us-gaap_DeferredIncomeTaxExpenseBenefit | 778us-gaap_DeferredIncomeTaxExpenseBenefit | 880us-gaap_DeferredIncomeTaxExpenseBenefit |
| Unrecognized Tax Benefits [Abstract] | |||
| Unrecognized federal tax benefits expense / (benefits) | 86unp_UnrecognizedFederalTaxBenefitsExpenseBenefit | (54)unp_UnrecognizedFederalTaxBenefitsExpenseBenefit | 5unp_UnrecognizedFederalTaxBenefitsExpenseBenefit |
| Unrecognized state tax benefits expense / (benefits) | 6unp_UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit | (1)unp_UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit | 2unp_UnrecognizedStateAndLocalTaxBenefitsExpenseBenefit |
| Unrecognized tax benefits expense / (benefits) | 92unp_UnrecognizedTaxBenefitsExpenseBenefit | (55)unp_UnrecognizedTaxBenefitsExpenseBenefit | 7unp_UnrecognizedTaxBenefitsExpenseBenefit |
| Total income tax expense | $ 3,163us-gaap_IncomeTaxExpenseBenefit | $ 2,660us-gaap_IncomeTaxExpenseBenefit | $ 2,375us-gaap_IncomeTaxExpenseBenefit |
| X | ||||||||||
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- Definition
The component of income tax expense for the period comprised of the net change during the period in the entity's domestic unrecognized tax benefit assets and liabilities attributable to uncertain tax positions taken in tax returns. No definition available.
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- Definition
The component of income tax expense for the period comprised of the net change during the period in the entity's state and local unrecognized tax benefit assets and liabilities attributable to uncertain tax positions taken in tax returns. No definition available.
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- Details
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- Definition
The component of income tax expense for the period comprised of the net change during the period in the entity's unrecognized tax benefit assets and liabilities attributable to uncertain tax positions taken in tax returns. No definition available.
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| X | ||||||||||
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- Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. 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 current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. 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 deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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