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Stock-based Compensation (Schedule of Stock Option Activities) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Stock Options [Member]    
Stock Option Activity [Abstract]    
Stock options, shares outstanding at January 1, 2015 5,387us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options, shares granted 934us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options, shares exercised (413)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options, shares forfeited or expired (8)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options, shares outstanding at March 31, 2015 5,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
5,387us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Stock options, shares vested or expected to vest at March 31, 2015 5,842us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options, shares exercisable at March 31, 2015 3,976us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, outstanding at January 1, 2015 $ 53.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, granted $ 122.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, exercised $ 44.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, forfeited or expired $ 80.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, outstanding at March 31, 2015 $ 65.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 53.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Stock options weighted-average exercise price, vested or expected to vest at March 31, 2015 $ 64.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average exercise price, options exercisable at March 31, 2015 $ 47.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options weighted-average remaining contractual term in years, outstanding at January 1, 2015   5 years 9 months 18 days
Stock options weighted-average remaining contractual term in years, outstanding at March 31, 2015 6 years 3 months 18 days  
Stock options weighted-average remaining contractual term in years, vested or expected to vest at March 31, 2015 6 years 2 months 12 days  
Stock options weighted-average remaining contractual term in years, options exercisable at March 31, 2015 4 years 10 months 24 days  
Stock options aggregate intrinsic value, outstanding at January 1, 2015 $ 353us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options aggregate intrinsic value, outstanding at March 31, 2015 268us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
353us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Stock options aggregate intrinsic value, vested or expected to vest at March 31, 2015 268us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Stock options aggregate intrinsic value, options exercisable at March 31, 2015 $ 240us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Retention Awards [Member]    
Awards Activity [Abstract]    
Awards, shares nonvested at January 1, 2015 3,403us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards, shares granted 519us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards, shares vested (894)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards, shares forfeited (23)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards, shares nonvested at March 31, 2015 3,005us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards weighted-average grant-date fair value, nonvested at January 1, 2015 $ 64.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards weighted-average grant-date fair value, granted $ 122.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards weighted-average grant-date fair value, vested $ 46.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards weighted-average grant-date fair value, forfeited $ 67.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Awards weighted-average grant-date fair value, nonvested at March 31, 2015 $ 79.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_RetentionAwardsMember
 
Performance Retention Awards [Member]    
Awards Activity [Abstract]    
Awards, shares nonvested at January 1, 2015 1,583us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards, shares granted 339us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards, shares vested (580)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards, shares forfeited (13)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards, shares nonvested at March 31, 2015 1,329us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards weighted-average grant-date fair value, nonvested at January 1, 2015 $ 65.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards weighted-average grant-date fair value, granted $ 117.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards weighted-average grant-date fair value, vested $ 54.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards weighted-average grant-date fair value, forfeited $ 72.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember
 
Awards weighted-average grant-date fair value, nonvested at March 31, 2015 $ 83.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= unp_PerformanceRetentionAwardsMember