Personal Injury Personal Injury [Policy Text Block] Disclosure of accounting policy for personal injury. Purchased services and materials Purchased services and materials Materials and contracted services to maintain infrastructure and equipment and terminal services at intermodal and automotive facilities. Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Vested or expected to vest (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Maximum employee subscription rate Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate Adjustments to reconcile net income to cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Parties Related Party Transactions Disclosure [Text Block] Total debt Long-Term Debt and Lease Obligation, Including Current Maturities Network route miles Network Route Miles The approximate number of route miles linking Pacific Coast and Gulf Coast ports with the Midwest and Eastern U.S. gateways and providing several corridors to key Mexican and Canadian gateways. Cover [Abstract] Cover [Abstract] After 2029 Lessee, Operating Lease, Liability, to be Paid, after Year Five Net change in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Accrual for Environmental Loss Contingencies [Roll Forward] Accrual for Environmental Loss Contingencies [Roll Forward] Schedule of Aggregate Operating Lease Maturities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Trading Symbol Trading Symbol Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Debt due after one year (Note 14) Long-Term Debt and Lease Obligation Non-NEOs Non-NEOs [Member] Unearned (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Unearned The number of equity-based payment instruments, excluding stock (or unit) options, that were unearned during the reporting period. Corporate stock Defined Benefit Plan, Equity Securities, Common Stock [Member] Cash dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Accounts receivable, allowance for credit loss, current Accounts Receivable, Allowance for Credit Loss, Current Illinois State Toll Highway Authority Illinois State Toll Highway Authority [Member] Represents Illinois State Toll Highway Authority. Line of Credit Facility [Table] Line of Credit Facility [Table] Accounts receivable, net Increase (Decrease) in Accounts Receivable Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Aggregate Intrinsic Value Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value Materials and Supplies Inventory, Policy [Policy Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash received from option exercises Proceeds from Stock Options Exercised Land Land [Member] Award Timing Disclosures [Line Items] Investment, Name [Domain] Investment, Name [Domain] Investing cash flows from operating leases Operating Lease, Payments, Use Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Equipment rents payable Accrued Rent, Current Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Plan Name [Domain] Plan Name [Domain] Other assets Other Assets, Noncurrent Leases [Abstract] Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Excess income tax benefits from equity compensation plans Excess income tax benefits from equity compensation plans Excess income tax benefits from equity compensation plans Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Deferred and other tax expense/(benefit): Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract] Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Reclassifications out of accumulated other comprehensive income/loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Secured Debt Secured Debt [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Award Timing Method Award Timing Method [Text Block] Other post retirement benefits periodic (benefit)/cost Net periodic pension (benefit)/cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Share Repurchase Program [Table] Share Repurchase Program [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted-average remaining lease term, Finance leases Finance Lease, Weighted Average Remaining Lease Term Environmental Environmental Costs, Policy [Policy Text Block] Insider Trading Policies and Procedures [Line Items] Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Use of Estimates Use of Estimates, Policy [Policy Text Block] Debt instrument, collateral amount Debt Instrument, Collateral Amount Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Payables and Accruals [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Interest from IRS refund claims Interest From Federal Refund Claims Interest From Federal Refund Claims Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Accounts Payable and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Company Selected Measure Amount Company Selected Measure Amount Tabular List, Table Tabular List [Table Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Beginning balance Ending balance Accrual for Environmental Loss Contingencies After 2029 Lease Liability, To Be Paid, Thereafter Amount of lessee's undiscounted obligation for lease payment for operating and finance leases due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Expected return on plan assets (as a percent) Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Common stock options (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Share-Based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Less: Interest Finance Lease, Liability, Undiscounted Excess Amount Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Credit Facility [Domain] Credit Facility [Domain] Schedule of Assets And Liabilities, Leases Schedule of Assets And Liabilities, Leases [Table Text Block] Schedule of Assets And Liabilities, Leases Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Other comprehensive income/(loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Current tax expense: Current Federal, State and Local, Tax Expense (Benefit) [Abstract] Stock options Share-Based Payment Arrangement, Option [Member] Depreciation Depreciation 2025 Lessee, Operating Lease, Liability, to be Paid, Year One Other financing activities, net Proceeds from (Payments for) Other Financing Activities Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Pension Plan Pension Plan [Member] Weighted-average discount rate, Finance leases Finance Lease, Weighted Average Discount Rate, Percent Real estate Employee Benefit Plan, Real Estate [Member] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 2025 Finance Lease, Liability, to be Paid, Year One Award Type [Axis] Award Type [Axis] Net deferred income tax liability Deferred Tax Liabilities, Net Bonds and debentures Corporate Debt Securities [Member] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Total liabilities Liabilities Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Options exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Translation of Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Equity Method Investee Equity Method Investee [Member] Current operating lease liabilities (Note 16) Operating Operating Lease, Liability, Current Total Shareholder Return Amount Total Shareholder Return Amount Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total equipment Equipment [Member] UPRR UPRR [Member] Information on the related parties. Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Cash paid during the year for: Cash Paid [Abstract] Cash Paid Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Lapse of statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Accumulated Depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Weighted average number of shares - diluted (in shares) Weighted average number of shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Freight revenues Total freight revenues Cargo and Freight [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Total common shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent Total deferred income tax assets Deferred Tax Assets, Gross Treasury stock Treasury Stock, Value Financial Instruments Financial Instruments Disclosure [Text Block] Accounts receivable, from securitization, default or dilution ratio (as a percent) Sensitivity Analysis Of Fair Value Transferors Interests In Transferred Financial Assets Percent Of Change In Default Or Dilution Ratios With No Impact Information on the impact of changes in the default or dilution ratios on the Accounts Receivable, from Securitization, Facility. Collective-Bargaining Arrangement [Domain] Collective-Bargaining Arrangement [Domain] Defined contribution plan, cost Defined Contribution Plan, Cost Railroad Transportation Equipment Railroad Transportation Equipment [Member] Expensed incurred on premiums paid Multiple-Employer Plan Accounted for as Multiemployer Plan, Contribution by Participating Entity Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Performance Stock Unit Awards Performance Stock Unit Awards [Member] Represents information regarding performance retention awards. Document Fiscal Period Focus Document Fiscal Period Focus 2028 Long-Term Debt, Maturity, Year Four All Executive Categories All Executive Categories [Member] Weighted-average number of shares outstanding, dilutive effect on shares Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Assets Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Outstanding, number (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Document Type Document Type Actuarial loss/(gain) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Options exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Commercial paper maturity duration, maximum Commercial Paper Maturity Duration Maximum Maximum duration of commercial paper maturities, in 'PnYnMnDTnHnMnS' format, for example, P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Other Income and Expenses [Abstract] Defined Benefit Plan [Table] Defined Benefit Plan [Table] Retention shares granted to each non-employee director upon initial election to board (in shares) Share Based Compensation Retention Shares Granted To Each Non Employee Director Upon Initial Election To Board Represents the number of retention shares or retention stock units granted to each non-employee director upon his or her initial election to the Board of Directors. Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Accounts payable Accounts payable, current Accounts Payable, Current Antidilutive Securities [Axis] Antidilutive Securities [Axis] Collective-Bargaining Arrangement [Axis] Collective-Bargaining Arrangement [Axis] Schedule of Annual Weighted Average Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Net lease cost Lease, Cost Term of depreciation studies (in years) Term Of Depreciation Studies Information on the term of depreciation studies to determine the estimated service lives of depreciable assets. Employer contribution match (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Property Deferred Tax Liabilities, Property, Plant and Equipment Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Variable lease cost Variable Lease, Cost Stock options outstanding (in shares) Share Based Compensation Arrangement By Share Based Payment Award Conditions Represents the number of awards subject to performance or market-based vesting conditions. Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Investment, Name [Axis] Investment, Name [Axis] Forecast Forecast [Member] Earnings per share - diluted (in dollars per share) Earnings Per Share, Diluted Counterparty Name [Domain] Counterparty Name [Domain] State and Local Jurisdiction State and Local Jurisdiction [Member] Schedule of Changes in Performance Stock Unit Awards Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Total current tax expense Current Income Tax Expense (Benefit) Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Award vesting rights (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Retirement Benefits [Abstract] Compensation contributed (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Other Deferred Tax Liabilities, Other Deferred tax expense adjustment Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Income tax expense (Note 7) Income tax expense Total income tax expense Income Tax Expense (Benefit) Interest cost Defined Benefit Plan, Interest Cost Forfeited or expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Recognized weighted-average period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Total operating revenues Revenue from Contract with Customer, Excluding Assessed Tax Authorized debt issuance Board Of Directors Authorized Debt Issuance Amount of debt issuance authorized by Board of Directors. Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Cash used in investing activities Net Cash Provided by (Used in) Investing Activities Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] All Adjustments to Compensation All Adjustments to Compensation [Member] Paid-in-surplus Additional Paid in Capital Other assets/(liabilities) Defined Benefit Plan, Other Assets (Liabilities) [Member] Represents other assets pension plan. Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Union Pacific Corporation 2013 Stock Incentive Plan Union Pacific Corporation 2013 Stock Incentive Plan [Member] Represents information regarding the Union Pacific Corporation 2013 Stock Incentive Plan. Commitments and Contingencies Disclosure [Abstract] Ballast Road Ballast [Member] Information on ballast. Scenario [Domain] Scenario [Domain] Name of Property [Domain] Name of Property [Domain] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] 401K Thrift Plan Before 2018 Four Zero One Thrift Plan Before 2018 [Member] Represents the 401 thrift plan before 2018. Unrealized gain on derivative instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Net periodic pension benefit/(costs) Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Vesting [Domain] Vesting [Domain] Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Liabilities and Common Shareholders' Equity Liabilities and Equity [Abstract] Schedule of Net Periodic Pension Benefit/Cost Schedule of Net Benefit Costs [Table Text Block] TTX Company TTX Company [Member] Represents information on TTX Company. Schedule of Weighted Average Lease Term and Discount Rate Supplemental Lease Information, Weighted Average Remaining Lease Term and Discount Rate [Table Text Block] Tabular disclosure of weighted average remaining lease term and discount rate. Deferred tax adjustments Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Other Other Nonoperating Income Expense, Other The amount of income (expense) from other nonoperating activities not otherwise specified. Restatement Determination Date Restatement Determination Date Vested or expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Colorado Department of Transportation Colorado Department of Transportation [Member] Represents Colorado Department of Transportation. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Income tax examination, penalties and interest accrued liabilities Income Tax Examination, Penalties and Interest Accrued Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Operating lease assets (Note 16) Operating leases Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Other roadway Road, Other [Member] Information on other railroad assets. Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration] Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration] Stock option (in shares) Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Expected return on plan assets, changes in fair value, period (in years) Defined Benefit Plan Expected Return On Plan Assets Changes In Fair Value Period The expected long-term rate of return on plan assets that is applied to a calculated value of plan assets that recognizes the changes in fair value over this period. Property, Plant and Equipment [Abstract] Payments Accrual for Environmental Loss Contingencies, Payments Earnings Per Share Earnings Per Share [Text Block] Subsequent Event Subsequent Event [Member] Receivables securitization facility repayments Receivables Securitization Facility Repayments Receivables Securitization Facility Repayments Restricted cash equivalents in other current assets Restricted Cash and Cash Equivalents, Current Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Locomotives Equipment, Locomotives [Member] Information on locomotives. Income Taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Schedule of Aggregate Finance Lease Maturities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Sites subject of actions taken by US government Sites Subject Of Actions Taken By US Government Sites subject of actions taken by the U.S. government. Chassis Assets Chassis Assets [Member] Chassis Assets PEO PEO [Member] 2025 Lease Liability, To Be Paid, Year One Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Name Trading Arrangement, Individual Name Funded status at end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Number of depreciable asset classes Number Of Depreciable Asset Classes Information on the number of depreciable asset classes. Performance period (in years) Share Based Compensation Arrangement by Share Based Payment Award, Performance Period Represents the performance period of share-based payment awards. Other subsidiary revenues Other Subsidiary Revenues [Member] Represents information regarding other subsidiary revenues. Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Entity Public Float Entity Public Float Excess tax benefits from equity compensation plans Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Railroad retirement system contributions Railroad Retirement System Contributions Represents Railroad Retirement System Agreement. Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Projected benefit obligation at beginning of year Projected benefit obligation at end of year Defined Benefit Plan, Benefit Obligation Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Outstanding debt as defined by facility Outstanding Debt As Defined By Facility Outstanding debt as defined by the credit facility. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Stock repurchase program, number of shares authorized to be repurchased (in shares) Share Repurchase Program, Authorized, Number of Shares Deferred tax assets, valuation allowance Deferred Tax Assets, Valuation Allowance Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Current portion, ending balance Accrued Environmental Loss Contingencies, Current Weighted-Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Changes in current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Noncurrent Liabilities, Noncurrent [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Interest payable Interest Payable, Current Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Vested or expected to vest (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Debt Disclosure [Abstract] Common Shares Common Stock [Member] Receivables facility Total Transfer Capacity Undivided Interests To Investors Under Receivables Securitization Facility Total capacity to transfer undivided interest to investors under receivables securitization facility. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] Other segment items Segment Reporting, Other Segment Item, Amount Real estate income Profit (Loss) from Real Estate Operations Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Accounts payable and other current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Union Pacific Corporation 2021 Employee Stock Purchase Plan Union Pacific Corporation 2021 Employee Stock Purchase Plan [Member] Represents information regarding the Union Pacific Corporation 2021 Employee Stock Purchase Plan. Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Title Trading Arrangement, Individual Title Consolidated Entities [Axis] Consolidated Entities [Axis] Unrecognized tax benefits at January 1 Unrecognized tax benefits at December 31 Unrecognized Tax Benefits City Area Code City Area Code Current liabilities: Current Liabilities, Current [Abstract] Auditor Location Auditor Location Revenue Recognition Revenue [Policy Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Other Expense Other Expense [Member] Schedule of Pre-Tax Changes Recognized in Comprehensive Income/Loss Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Income and other taxes Increase (Decrease) in Accrued Taxes Payable 2028 Lease Liability, To Be Paid, Year Four Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Share repurchase programs (Note 18) Payments for Repurchase of Common Stock Accessorial revenues Accessorial Revenues [Member] Represents information on accessorial revenues. Accounts Receivable Receivable [Policy Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Weighted-Average Grant-Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Share and Per Share (Note 8): Earnings Per Share [Abstract] Equity [Abstract] Administrative Administrative Expense Administrative Expense Retained earnings Retained Earnings (Accumulated Deficit) Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Retention awards Retention Awards [Member] Represents information regarding retention awards. Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Forfeited or expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule of Debt Schedule of Debt [Table Text Block] Deferred and other income taxes Deferred Income Taxes and Tax Credits 2026 Long-Term Debt, Maturity, Year Two Aggregate grant-date fair value of stock options vested Aggregate Grant Date Fair Value Of Stock Options Vested Represents the aggregate grant-date fair value of stock options vested during the period. Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Present value of lease liabilities Operating Lease, Liability Underlying Securities Award Underlying Securities Amount 2029 Finance Lease, Liability, to be Paid, Year Five Amendment Flag Amendment Flag Commercial paper outstanding Commercial Paper Gain recognized in other expense Gain or loss from retirement of properties Gain (Loss) on Disposition of Property Plant Equipment Income tax examination, penalties and interest expense (benefit) Income Tax Examination Penalties And Interest Expense Benefit The sum of the amounts of estimated penalties and interest expense (benefit) recognized in the period arising from income tax examinations. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Amortization of leased assets Finance Lease, Right-of-Use Asset, Amortization Debt securities Defined Benefit Plan, Debt Security [Member] Underfunded accumulated benefit obligation Defined Benefit Plan, Underfunded Accumulated Benefit Obligation Represents underfunded accumulated benefit obligation. Reportable Segment Reportable Segment [Member] Reportable Segment Other Income Other Income and Other Expense Disclosure [Text Block] Actual return/(loss) on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Loss Contingency Accrual [Roll Forward] Loss Contingency Accrual [Roll Forward] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Accruals Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses Receivables securitization facility issued Receivables Securitization Facility Issued Receivables Securitization Facility Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Schedule of Amounts Recognized in Statement of Financial Position Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Other investing activities, net Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Auditor Name Auditor Name Railroad Transportation Track Assets Railroad Transportation Track Assets [Member] Track assets including rails, ties, ballast, and other track materials. Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Debt coverage ratio Allowable Debt Per Debt To Net Worth Coverage Ratio As Defined Facility Total amount of debt (as defined in the facility) the debt-to-net-worth coverage ratio allowable under the revolving credit facility. Estimated Useful Life Property, Plant and Equipment, Useful Life Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Employee Stock ESPP Employee Stock [Member] Fair value of total debt less of carrying value Fair Value Of Total Debt Less Of Carrying Value Fair Value Of Total Debt Less Of Carrying Value Discount rate for service cost Discount rate for service cost Weighted average rate for present value of future retirement benefits cash flows for service cost , used to determine net periodic benefit cost of defined benefit plan. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Properties, net (Note 11) Net Book Value Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Financing cash flows from finance leases Finance Lease, Principal Payments Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Weighted-average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Union Pacific Corporation 2021 Stock Incentive Plan Union Pacific Corporation 2021 Stock Incentive Plan [Member] Represents information regarding the Union Pacific Corporation 2021 Stock Incentive Plan. Projected benefit obligation Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Total assets Assets Capital investments Payments to Acquire Property, Plant, and Equipment Other long-term liabilities Other Liabilities, Noncurrent Share Repurchase Programs Treasury Stock [Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and contingencies (Note 17) Commitments and Contingencies Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Nature of Operations Nature of Operations [Text Block] Related Party Transaction [Table] Related Party Transaction [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two 2025 Long-Term Debt, Maturity, Year One Schedule of Environmental Liability Activity Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] Tabular disclosure of the environmental loss contingencies that were reported in the period or disclosed as of the balance sheet date. Ties Road Ties [Member] Information on railroad ties. Plan Assets Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Net income Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Years 2030 - 2034 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] 401K Thrift Plan 2018 Beyond Four Zero One Thrift Plan 2018 Beyond [Member] Represents 401k/thrift plan. Schedule of Pension Plan Asset Allocation Schedule of Allocation of Plan Assets [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Schedule of Share Repurchase Programs Share Repurchase Program [Table Text Block] Tabular disclosure of information related to share repurchase programs. Entity File Number Entity File Number Schedule of Weighted Average Actuarial Assumptions Defined Benefit Plan, Assumptions [Table Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Federal Current Federal Tax Expense (Benefit) Cash dividends declared Dividends, Common Stock Name Forgone Recovery, Individual Name Options exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Weighted-average remaining lease term, Operating leases Operating Lease, Weighted Average Remaining Lease Term Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Louisiana and Arkansas Department of Revenue Louisiana And Arkansas Department of Revenue [Member] Represents Nebraska, Iowa, Kansas, and Arkansas Department of Revenue. Investments Investment, Policy [Policy Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Deferred income tax liabilities: Components of Deferred Tax Liabilities [Abstract] Qualified Qualified Plan [Member] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Decreases for positions taken in prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Equipment and other rents Equipment and other rents Rent paid for freight cars owned by other railroads or private companies, net of rents received, including lease expenses primarily for locomotives, railcars, containers and trailers, office and other rentals. Adjustment to Compensation: Adjustment to Compensation [Axis] Restricted cash equivalents in other assets Restricted Cash and Cash Equivalents, Noncurrent Railroad Assets, Equipment Railroad Assets, Equipment [Member] Information on equipment. Weighted-average maturity of pension plan debt portfolio (in years) Weighted Average Maturity Of Pension Plan Debt Portfolio Represents the weighted-average maturity of the Pension Plan debt portfolio. Defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Accumulated other comprehensive loss (Note 9) Accumulated Other Comprehensive Income (Loss), Net of Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Weighted average number of shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Remaining debt issuance Board Of Directors Remaining Debt Issuance Amount of debt issuance remaining under current authority by Board of Directors. Target Allocation 2025 Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Name Awards Close in Time to MNPI Disclosures, Individual Name Construction in progress Construction in Progress [Member] Entity Filer Category Entity Filer Category Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Share Repurchase Program [Abstract] Receivables securitization facility, duration (in years) Receivables Securitization Facility Duration Duration of the receivables securitization facility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Lease, Cost Lease, Cost [Table Text Block] Real Estate Transaction Real Estate Transaction [Member] Real Estate Transaction Less: Interest Lease Liability Undiscounted Excess Amount Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating and finance leases. Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Award vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Asset allocation target, evaluation period (in years) Defined Benefit Plan, Plan Assets, Target Allocation, Evaluation Period Defined Benefit Plan, Plan Assets, Target Allocation, Evaluation Period Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Income taxes, net of refunds Income Taxes Paid, Net Schedule of Stock Based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Equity method investments Equity Method Investments Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Total leased assets Lease, Right-of-Use Asset Amount of lessee's of right-of-use assets from leases. Other operating activities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Other Performance Measure, Amount Other Performance Measure, Amount Compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Leases Lessee, Operating Leases [Text Block] Common share outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Operating lease cost Operating Lease, Cost Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Operating lease liabilities (Note 16) Operating Operating Lease, Liability, Noncurrent Gross benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Gain from land sale Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Other revenues Product and Service, Other [Member] Interest on lease liabilities Finance Lease, Interest Expense Discount rate for benefit obligations Discount rate for benefit obligations Represents discount rate for benefit obligations of net periodic benefit cost for assumption used calculating Defined benefit plan. Service cost Defined Benefit Plan, Service Cost Entity Tax Identification Number Entity Tax Identification Number Equity securities Defined Benefit Plan, Equity Securities [Member] Accounting Standards Update and Change in Accounting Principle [Abstract] Share repurchase programs (Note 18) (in shares) Treasury stock, shares, acquired (in shares) Number of Shares Purchased (in shares) Treasury Stock, Shares, Acquired Foreign Deferred Foreign Income Tax Expense (Benefit) Retirement Plan Type [Axis] Retirement Plan Type [Axis] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Commercial paper maturity duration, minimum Commercial Paper Maturity Duration Minimum Minimum duration of commercial paper maturities, in 'PnYnMnDTnHnMnS' format, for example, P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Route miles owned Route Miles Owned Number of route miles owned by the Company. Treasury Shares Treasury Stock, Common [Member] Income and other taxes payable Taxes Payable, Current Contributing annual amount (as a percent) Defined Contribution Plan Additional Annual Employer Contribution Percent Of Employees Gross Pay Percentage of employees' gross pay for which the employer contributes in addition to the matching contribution to a defined contribution plan. Schedule of Additional Information Regarding Stock Option Exercises Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block] Other Other Cost and Expense, Operating Plan Name [Axis] Plan Name [Axis] After 2029 Finance Lease, Liability, to be Paid, after Year Five Equity Components [Axis] Equity Components [Axis] Total lease payments Finance Lease, Liability, to be Paid Other current assets Other Assets, Current Pension Benefits Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Total operating expenses Costs and Expenses Loss on pre tax Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Audit Information [Abstract] Audit Information [Abstract] Income tax examination, penalties and interest receivables Income Tax Examination Penalties And Interest Accrued Receivables The amount of estimated penalties and interest accrued as receivables as of the balance sheet date arising from income tax examinations. Cash contributions Payment for Pension Benefits Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Geographical [Axis] Geographical [Axis] 2029 Lessee, Operating Lease, Liability, to be Paid, Year Five Accrued casualty costs Current portion, ending balance at December 31 Loss Contingency, Accrual, Current Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Beginning balance Ending balance at December 31 Loss Contingency Accrual Cost of property repairs and maintenance Cost of Property Repairs and Maintenance Changes in estimates for prior years Changes in estimates for prior years Amount of expense (reversal of expense) which increases (decreases) the accrual for loss contingencies from revisions in estimates to existing obligations. Cash, cash equivalents, and restricted cash at beginning of year Cash, cash equivalents, and restricted cash at end of year Total cash, cash equivalents, and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Foreign Current Foreign Tax Expense (Benefit) Net actuarial (loss)/gain Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Current assets: Assets, Current [Abstract] Stock-based compensation, before tax: Share-Based Payment Arrangement, Noncash Expense [Abstract] Beginning balance (in shares) Ending balance (in shares) Treasury Stock, Common, Shares Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Short-term lease cost Short-Term Lease, Cost Rail and other track material Roadrail and Other Track Material [Member] Information on rail and other track material. Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair Value Disclosures [Abstract] Security Exchange Name Security Exchange Name Exercised (in shares) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] State Current State and Local Tax Expense (Benefit) Compensation and benefits Labor and Related Expense Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Other comprehensive income/(loss), deferred taxes Net year-to-date other comprehensive income/(loss), taxes Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Schedule of Pension Plan Measured at Fair Value on Recurring Basis Defined Benefit Plan, Plan Assets, Category [Table Text Block] Common stock issued (in shares) Common Stock, Shares, Issued Amortization of: Actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Real estate funds Real Estate Funds [Member] Debt repaid Repayments of Debt and Lease Obligation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Common stock authorized (in shares) Common Stock, Shares Authorized Operating lease liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Operating Lease Liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Operating Lease Liabilities Asset-Backed Securities, Securitized Loans and Receivables Asset-Backed Securities, Securitized Loans and Receivables [Member] Venture capital and buyout partnerships Venture Capital And Buyout Partnerships [Member] Represents venture capital and buyout partnerships. Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Entity Voluntary Filers Entity Voluntary Filers Amortization of actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Interest expense Interest Expense, Nonoperating Total deferred and other tax expense Deferred Income Tax Expense (Benefit) Properties Property, Plant and Equipment Disclosure [Text Block] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Income tax benefit realized from option exercises Share-Based Payment Arrangement, Exercise of Option, Tax Benefit Total other comprehensive income/(loss) Other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Fair Value, Recurring Fair Value, Recurring [Member] Accounts receivable, net (Note 10) Accounts Receivable, after Allowance for Credit Loss, Current Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total debt Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Total lease payments Total Minimum Payment Required Amount of lessee's undiscounted obligation for lease payment for operating and finance leases. Fair value of plan assets at beginning of year Fair value of plan assets at end of year Total plan assets Defined Benefit Plan, Plan Assets, Amount Collective trust and other funds Collective Trust And Other Funds [Member] Collective Trust And Other Funds Thereafter Long-Term Debt, Maturity, after Year Five Employer matching contribution (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Match Increases/(decreases) for interest and penalties Increases/(decreases) for interest and penalties Amount of increase (decrease) in unrecognized tax benefits resulting from the increase (decrease) in interest and penalties. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Average Price Paid (in dollars per share) Shares Acquired, Average Cost Per Share Investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Document Annual Report Document Annual Report 2027 Finance Lease, Liability, to be Paid, Year Three Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Discount rate for interest on benefit obligations Discount rate for interest on benefit obligations Represents discount rate for interest on benefit obligations for defined benefit plan assumptions used calculating for defined benefit plan. Liabilities Liabilities [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Operating revenues: Revenues [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount 2029 Lease Liability, To Be Paid, Year Five Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). PEO Name PEO Name Finance lease net of accumulated amortization Finance Lease, Right-of-Use Asset, Accumulated Amortization Shares issued in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Vesting [Axis] Vesting [Axis] Award Type [Domain] Award Type [Domain] Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Short-term investments (Note 13) Short-term investments Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Noncurrent liabilities Liability, Defined Benefit Plan, Noncurrent Non-PEO NEO Non-PEO NEO [Member] Other comprehensive income/(loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Paid-in- Surplus Additional Paid-in Capital [Member] Finance Finance Lease, Liability, Noncurrent Retirement Plans Retirement Benefits [Text Block] Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Treasury shares repurchased for employee payroll taxes Treasury Shares Repurchased For Employee Payroll Taxes Represents the amount of treasury shares repurchased for employee payroll taxes. 2028 Finance Lease, Liability, to be Paid, Year Four Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Compensation-related accruals Accrued Employee Benefits, Current Number of operating segments Number of Operating Segments Deferred income tax assets: Components of Deferred Tax Assets [Abstract] Remaining number of shares that may be repurchased under current authority (in shares) Share Repurchase Program, Remaining Authorized, Number of Shares Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Total road Road [Member] Information on total roads. Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Defined benefit plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Total Operating And Finance Lease, Liability [Abstract] Operating And Finance Lease, Liability Auditor Firm ID Auditor Firm ID Refunds from/(payments to) and settlements with taxing authorities Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities Effective tax rate Effective Income Tax Rate Reconciliation, Percent Operating income Operating Income (Loss) Number of reportable segments Number of Reportable Segments Total liabilities and common shareholders' equity Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] 2026 Finance Lease, Liability, to be Paid, Year Two Interest income Investment Income, Interest Dividends paid Payments of Dividends Debt due within one year (Note 14) Less: current portion Long-Term Debt and Lease Obligation, Current Schedule of Changes in Retention Awards Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Leased assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Individual: Individual [Axis] AOCI Total AOCI Attributable to Parent [Member] Expected life (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Operating expenses: Operating Expenses [Abstract] Union Pacific Corporation 2000 Directors Plan Union Pacific Corporation 2000 Directors Plan [Member] Represents information regarding the Union Pacific Corporation 2000 Directors Plan. Gross benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Schedule of Property and Equipment and Weighted Average Estimated Useful Life Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Operating Operating Expense Operating Expense Loss contingency, estimate of possible loss Loss Contingency, Estimate of Possible Loss Unamortized discount and deferred issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Share Repurchase Program [Line Items] Share Repurchase Program [Line Items] Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date Related Party Transactions [Abstract] Fuel Fuel Costs Schedule of Accumulated benefit Obligation in Excess of Fair Value Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Total principal Total principal Receivables facility Long-Term Debt, Gross Value outstanding, undivided interest held by investors under receivables securitization facility Value Outstanding Undivided Interest Held By Investors Under Receivables Securitization Facility Value of the outstanding undivided interest held by investors under the receivables securitization facility. Exercise Price Award Exercise Price Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Arrangement Duration Trading Arrangement Duration Leases Lessee, Finance Leases [Text Block] Total Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Common shareholders' equity: Equity, Attributable to Parent [Abstract] Accrued casualty costs Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves Name of Property [Axis] Name of Property [Axis] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Total lease liabilities Total Lease liability Present value of lessee's discounted obligation for lease payments from operating and finance leases. Present value of lease liabilities Finance Lease, Liability All Individuals All Individuals [Member] Finance Lease Finance Lease [Member] Information on finance leases. Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Debt Instrument, fair value disclosure Debt Instrument, Fair Value Disclosure Other income, net (Note 6) Other income, net Total Other Nonoperating Income (Expense) Other Postretirement Benefits Plan Other Postretirement Benefits Plan [Member] Industrial Industrial [Member] Represents information regarding Industrial revenues. Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Receivables [Abstract] Current liabilities Liability, Defined Benefit Plan, Current Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Accounts payable and other current liabilities (Note 12) Total accounts payable and other current liabilities Accounts Payable and Accrued Liabilities, Current Schedule of Personal Injury Liability Activity Schedule of Loss Contingencies by Contingency [Table Text Block] Sites on superfund national priorities list Sites On Super fund National Priorities List Sites on the Superfund National Priorities List. Nebraska, Iowa, Arkansas, and Idaho Department of Revenue Nebraska, Iowa, Arkansas, and Idaho Department of Revenue [Member] Represents Nebraska, Oklahoma, Idaho, Louisiana and Arkansas departments of revenue. Non-operating property environmental remediation and restoration Environmental Remediation And Restoration Represents non-operating environmental income. Deferred income taxes (Note 7) Deferred Income Tax Liabilities, Net Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based payment award, award requisite service period (in months) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Federal Deferred Federal Income Tax Expense (Benefit) Cash, Cash Equivalents, and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Projected Benefit Obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Measure: Measure [Axis] Conversion, stock option exercises, forfeitures, ESPP, and other Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Increases for positions taken in current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year One Entity Emerging Growth Company Entity Emerging Growth Company 2029 Long-Term Debt, Maturity, Year Five Technology and other Technology Equipment [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Schedule of Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Equity Component [Domain] Equity Component [Domain] Other post retirement benefits liability Net amounts recognized at end of year Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Shell Company Entity Shell Company Valuation Allowance [Line Items] Valuation Allowance [Line Items] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Dividends received deduction Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Statement [Table] Statement [Table] Cross default provision Cross Default Provision As Defined By Facility Cross-default provision, as defined by facility. Counterparty Name [Axis] Counterparty Name [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Significant Accounting Policies Significant Accounting Policies [Text Block] Interest, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Cost Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Quoted Prices in Active Markets for Identical Inputs (Level 1) Fair Value, Inputs, Level 1 [Member] Materials and supplies Materials, Supplies, and Other Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Accrued wages Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Options exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number 2027 Long-Term Debt, Maturity, Year Three Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Non-qualified plan benefit contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Weighted-average grant-date fair value of options granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Materials and supplies Increase (Decrease) in Materials and Supplies Income Taxes Income Tax Disclosure [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Premium Premium [Member] Represents information regarding Premium revenues. Accounts receivable, supporting undivided investor held interest Accounts Receivable Supporting Undivided Investor Held Interest The value of the accounts receivable that supported the value of the undivided interest held by investors. Organization, Consolidation and Presentation of Financial Statements [Abstract] Weighted-average discount rate, Operating leases Operating Lease, Weighted Average Discount Rate, Percent Bulk Bulk [Member] Represents information regarding Bulk revenues. Cash used in financing activities Net Cash Provided by (Used in) Financing Activities Credit Facility [Axis] Credit Facility [Axis] 2027 Lease Liability, To Be Paid, Year Three Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Other Other Miscellaneous Product and Service Revenues [Member] Represents information on other miscellaneous product and service revenues. Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent State Deferred State and Local Income Tax Expense (Benefit) Fair Value as of Grant Date Award Grant Date Fair Value Noncurrent assets Assets for Plan Benefits, Defined Benefit Plan Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Vested or expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Geographical [Domain] Geographical [Domain] Principles of Consolidation Consolidation, Policy [Policy Text Block] Discount rate for interest on service cost Discount rate for interest on service cost Represents discount rate for interest on service cost for defined benefit plan assumption used calculating net periodic benefit cost. Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common shares, $2.50 par value, 1,400,000,000 authorized; 1,113,018,733 and 1,112,854,806 issued; 604,241,260 and 609,703,814 outstanding, respectively Common Stock, Value, Issued Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Share-Based Payment Arrangement [Abstract] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Personal Injury Personal Injury Personal Injury [Member] The risk of loss arises with respect to personal injuries. Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] State statutory rates, net of federal benefits Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Other Deferred Tax Assets, Other Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total deferred income tax liabilities Deferred Tax Liabilities, Gross Freight cars Equipment, Freight Cars [Member] Information on freight cars. Earnings per share - basic (in dollars per share) Earnings Per Share, Basic Repayments of commercial paper Repayments of Commercial Paper Sites identified Sites Identified Sites identified at which Railroad is or may be liable for remediation costs associated with alleged contamination or for violations of environmental requirements. Operating cash flows from operating leases Operating Lease, Payments Mexico MEXICO Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Award expiration period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Non-qualified Nonqualified Plan [Member] Capital investments accrued but not yet paid Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Percentage of Plan Assets Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage ESPP employee contribution annual limit ESPP Employee Contribution Annual Limit ESPP employee contribution annual limit. Property and Depreciation Property, Plant and Equipment, Policy [Policy Text Block] Total current liabilities Liabilities, Current Proceeds from issuance of commercial paper Proceeds from Issuance of Commercial Paper Unearned (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Unearned Weighted Average Grant Date Fair Value Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were unearned. Credit facility withdrawals Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Federal government securities US Treasury and Government [Member] Notes and Debentures Notes Payable to Banks [Member] Schedule of Cash Contributions Cash Contributions for Qualified Pension Plan, Benefit Payments for Non Qualified OPEB Plans [Table Text Block] Tabular disclosure of cash contributions for qualified pension plans and benefit payments for non qualified OPEB plans. Stock Options and Other Stock Plans Share-Based Payment Arrangement [Text Block] CollectiveBargaining Arrangement, Other Collective-Bargaining Arrangement, Other [Member] Entity Address, City or Town Entity Address, City or Town Debt issued (Note 14) Proceeds from Issuance of Long-Term Debt Leases Lessee, Leases [Policy Text Block] Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Intrinsic value of stock options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Total stock-based compensation, before tax Share-Based Payment Arrangement, Expense Granted (in shares) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Accumulated Other Comprehensive Income/Loss Comprehensive Income (Loss) Note [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Work equipment and other Equipment, Work Equipment and Other [Member] Information on work and Other equipment. Operating lease assets Deferred Tax Liabilities, Leasing Arrangements Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Share repurchase programs (Note 18) Treasury Stock, Value, Acquired, Cost Method Other Other Accrued Liabilities, Current Document Period End Date Document Period End Date Current year accruals Loss Contingency Accrual, Provision 2026 Lease Liability, To Be Paid, Year Two Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Finance Finance Lease, Liability, Current Lessee, operating lease, liability, to be paid Total lease payments Lessee, Operating Lease, Liability, to be Paid Equipment Obligations Equipment Trust Certificate [Member] Schedule of Net Funded Status Schedule of Net Funded Status [Table Text Block] Retention shares (in shares) Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] Other current assets Increase (Decrease) in Other Current Assets 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Deferred Tax Asset, Valuation Allowance [Table] Deferred Tax Asset, Valuation Allowance [Table] Defined benefit pension plan Defined Benefit Plan, Accumulated Benefit Obligation Document Transition Report Document Transition Report Schedule of Unrecognized Tax Benefits Liabilities (Assets) Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Accounts receivable, allowance for credit loss, noncurrent Accounts Receivable, Allowance for Credit Loss, Noncurrent Nebraska, Iowa, Kansas, and Arkansas Department of Revenue Nebraska, Iowa, Kansas, and Arkansas Department of Revenue [Member] Represents Nebraska, Iowa, Arkansas, and Idaho Department of Revenue. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Payments Loss Contingency Accrual, Payments Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Amounts reclassified from accumulated other comprehensive income/(loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Unrealized gain on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Company Selected Measure Name Company Selected Measure Name