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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share Details [Abstract]    
Net income $ 1,151us-gaap_NetIncomeLoss $ 1,088us-gaap_NetIncomeLoss
Weighted-Average Number Of Shares Outstanding    
Basic 879.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 908.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options 1.8unp_WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfStockOptions 2.6unp_WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfStockOptions
Dilutive effect of retention shares and units 1.7unp_WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfRetentionSharesAndUnits 1.8unp_WeightedAverageNumberOfSharesOutstandingDilutiveEffectOfRetentionSharesAndUnits
Diluted 882.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 912.5us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share - basic $ 1.31us-gaap_EarningsPerShareBasic $ 1.20us-gaap_EarningsPerShareBasic
Earnings per share - diluted $ 1.30us-gaap_EarningsPerShareDiluted $ 1.19us-gaap_EarningsPerShareDiluted
Stock options excluded as their inclusion would be antidilutive 0.6us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount