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Debt (Details 5) (USD $)
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12 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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May 20, 2014
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Dec. 31, 2013
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Jan. 10, 2014
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Aug. 12, 2014
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Feb. 05, 2015
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Jan. 29, 2015
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| Receivables Securitization Facility Debt [Abstract] |
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| Secured debt under receivables securitization facility |
400,000,000unp_SecuredDebtUnderReceivablesSecuritizationFacility |
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$ 0unp_SecuredDebtUnderReceivablesSecuritizationFacility |
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| Unsecured Debt [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Board of Directors remaining debt issuance |
1,150,000,000unp_BoardOfDirectorsRemainingDebtIssuance
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Unsecured Debt [Member] | 2.25% Notes Due 2019 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 10, 2014 |
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| Note amount |
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300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2019225PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Maturity date on new borrowing |
Feb. 15, 2019 |
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| Interest rate on note |
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2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2019225PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Unsecured Debt [Member] | 3.75% Notes Due 2024 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 10, 2014 |
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| Note amount |
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400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2024375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Maturity date on new borrowing |
Mar. 15, 2024 |
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| Interest rate on note |
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3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2024375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Unsecured Debt [Member] | 4.85% Notes Due 2044 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 10, 2014 |
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| Note amount |
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300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2044485PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Maturity date on new borrowing |
Jun. 15, 2044 |
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| Interest rate on note |
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4.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2044485PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Unsecured Debt [Member] | 3.25% Notes Due 2025 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Aug. 12, 2014 |
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| Note amount |
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350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2025325PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Maturity date on new borrowing |
Jan. 15, 2025 |
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| Interest rate on note |
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3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2025325PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Unsecured Debt [Member] | 4.15% Notes Due 2045 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Aug. 12, 2014 |
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| Note amount |
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350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2045415PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Maturity date on new borrowing |
Jan. 15, 2045 |
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| Interest rate on note |
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4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2045415PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember |
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| Pass-Through Trust Certificate [Member] | 3.227% Certificates Due 2026 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
May 20, 2014 |
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| Note amount |
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500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_CertificatesDue20263227PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_EquipmentTrustCertificateMember |
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| Maturity date on new borrowing |
May 14, 2026 |
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| Interest rate on note |
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3.227%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_CertificatesDue20263227PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_EquipmentTrustCertificateMember |
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| Total locomotives financed from proceeds |
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245unp_TotalLocomotivesFinancedFromProceeds
/ us-gaap_DebtInstrumentAxis
= unp_CertificatesDue20263227PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_EquipmentTrustCertificateMember |
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| Debt issuance costs |
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3,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= unp_CertificatesDue20263227PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_EquipmentTrustCertificateMember |
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| Subsequent Event [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Board of Directors authorized debt issuance |
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4,000,000,000unp_BoardOfDirectorsAuthorizedDebtIssuance
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
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| Subsequent Event [Member] | Unsecured Debt [Member] | 1.80% Notes Due 2020 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 29, 2015 |
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| Note amount |
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250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2020180PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
| Maturity date on new borrowing |
Feb. 01, 2020 |
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| Interest rate on note |
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1.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue2020180PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
| Subsequent Event [Member] | Unsecured Debt [Member] | 3.375% Notes Due 2035 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 29, 2015 |
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| Note amount |
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450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue20353375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
| Maturity date on new borrowing |
Feb. 01, 2035 |
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| Interest rate on note |
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3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue20353375PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
| Subsequent Event [Member] | Unsecured Debt [Member] | 3.875% Notes Due 2055 [Member] |
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| Shelf Registration Statement and Significant New Borrowings [Abstract] |
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| Issuance date |
Jan. 29, 2015 |
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| Note amount |
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$ 450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue20553875PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |
| Maturity date on new borrowing |
Feb. 01, 2055 |
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| Interest rate on note |
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3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= unp_NotesDue20553875PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember |