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to Parent [Member] All Individuals All Individuals [Member] Long-term Debt (Including Current Maturities): Debt Instrument, Fair Value Disclosure Schedule of Balance Sheet Presentation of Casualty, Environmental and Other Reserves Schedule of Loss Contingencies by Contingency [Table Text Block] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 3.25% Notes Due 2027 3.25% Notes Due 2027 [Member] 3.25% Notes Due 2027 Total Casualty Casualty Total Casualty [Member] Total reserves for casualty, including personal injury, occupational and asbestos. 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Other Defendants Other Defendants [Member] Other Defendants Increase in quarterly dividend percentage Common Stock, Dividend Rate Increase, Percentage Common Stock, Dividend Rate Increase, Percentage Retained Earnings Retained Earnings [Member] Long-term Lease Liability Operating Lease, Liability, Noncurrent Income and Other Taxes Payable Taxes Payable, Current Self-insured retention amount per injury Self-insured retention amount, per occurrence (up to) Self Insured Retention Self insured retention amount for casualty and catastrophic property programs. Revolving Credit Facility Revolving Credit Facility [Member] Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Net of Tax, Period Change [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Schedule of Fair Value and Carrying Value of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Net Earnings Per Share, Assuming Dilution (in dollars per share) Net Earnings Per Share, Assuming Dilution (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net Cash Used in Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Cash Flow Hedging Cash Flow Hedging [Member] Site contingency, number of parties liable Site Contingency, Number Of Parties Liable Site Contingency, Number Of Parties Liable Environmental Environmental Litigation [Member] Environmental Litigation Automotive Automotive [Member] Automotive [Member] Litigation Case [Domain] Litigation Case [Domain] Line of Credit Facility Line of Credit Facility [Line Items] Current Portion Current Liabilities [Member] Current Liabilities [Member] Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Contingencies [Table] Contingencies [Table] Contingencies [Table] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Tax Expense Reclassification from AOCI, Current Period, Tax FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Properties - Net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Revenue Revenue from Contract with Customer, Excluding Assessed Tax Interest Cost Defined Benefit Plan, Interest Cost Forest Products Forest Products [Member] Forest Products [Member] Two Separate Fixed-to-Floating Interest Rate Swaps Two Separate Fixed-to-Floating Interest Rate Swaps [Member] Two Separate Fixed-to-Floating Interest Rate Swaps Financial Instruments [Domain] Financial Instruments [Domain] Number of equivalent shares of CSX common stock per unit of award (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Equivalent Shares Of Common Stock Per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Equivalent Shares of Common Stock Per Unit Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Purchases of Short-Term Investments Payments to Acquire Short-Term Investments Fair Value Estimate of Fair Value Measurement [Member] Revenues Revenue from Contract with Customer [Text Block] Number of entities Loss Contingency, Number Of Entities Loss Contingency, Number Of Entities Baseline sampling, number of miles Loss Contingency, Baseline Sampling, Number Of Miles Loss Contingency, Baseline Sampling, Number Of Miles Other Current Liabilities Increase (Decrease) in Other Current Liabilities Required financial assurance to be secured Loss Contingency, Required Financial Assurance To Be Secured Loss Contingency, Required Financial Assurance To Be Secured Other Investing Activities Payment for (Proceeds from) Other Investing Activity Segment Reporting [Table] Segment Reporting [Table] Expected contributions to the Company's qualified pension plans in 2026 Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Individual claims expected to exceed self-insured retention amount Loss Contingency Number of Claims Expected to Exceed Self Insured Retention Amount Total number of claims expected to exceed self-insured retention amount, as of the balance sheet date. 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Options, Relative Total Shareholder Return, Weight MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other Current Liabilities Other Liabilities, Current Award term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other Long-term Assets Other Assets, Noncurrent Document Type Document Type Business Acquisition, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Materials and Supplies Materials, Supplies, and Other Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining amount Share Repurchase Program, Remaining Authorized, Amount Total Expense Expenses Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Fuel Type [Axis] Fuel Type [Axis] Fuel Type Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Long-term Debt Issued (Note 7) Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Earnings Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Properties Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Debt Type [Domain] Debt Type [Domain] Debt Type [Domain] Award vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Award Type [Domain] Award Type [Domain] Other Accumulated Other Adjustments to Parent [Member] Accumulated Other Adjustments to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Other Other Services [Member] Other Services [Member] Fair Value Measurements Fair Value Disclosures [Text Block] PEO Name PEO Name Total Included in Other Income - Net Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Interest Rate Derivatives Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Seven Fixed-to-Floating Interest Rate Swaps Seven Fixed-to-Floating Interest Rate Swaps [Member] Seven Fixed-to-Floating Interest Rate Swaps Payout percentage grant value Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Payout Percentage Grant Value Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Payout Percentage Grant Value Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Carrying Amount of Hedged Notes Hedged Liability, Fair Value Hedge Income Tax Benefit Share-Based Payment Arrangement, Expense, Tax Benefit Cash and Cash Equivalents Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Accounts Payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Derivative instrument, period following debt maturity, hedged transaction Derivative Instrument, Period Following Debt Maturity, Hedged Transaction Derivative Instrument, Period Following Debt Maturity, Hedged Transaction Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Labor and Fringe Labor and Fringe Labor and Related Expense Employee Stock Purchase Plan Employee Stock [Member] Net Earnings Per Share, Basic (in dollars per share) Net Earnings Per Share, Basic (in dollars per share) Earnings Per Share, Basic Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Shares Repurchased Payments for Repurchase of Common Stock Total Current Assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reclassifications Long-term Debt, Increase (Decrease) Due To Reclassifications Long-term Debt, Increase (Decrease) Due To Reclassifications Number of rail route miles Rail Route Network, Distance Rail Route Network, Distance Time Deposits Bank Time Deposits [Member] Award Type [Axis] Award Type [Axis] Fair Value Liability Adjustment to Hedged Notes Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts Receivable - Net (Note 8) Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Share Repurchase Activity Class of Treasury Stock [Table Text Block] Retained Earnings Retained Earnings (Accumulated Deficit) Stock Option Exercises and Other (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Options, Exercises In Period And Other Share-based Compensation Arrangement By Share-based Payment Award, Options, Exercises In Period And Other Product and Service [Axis] Product and Service [Axis] 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Benefits Cost Pension Plan [Member] Common Shares Outstanding (Thousands) Common Stock [Member] Debt securities Debt Securities, Available-for-Sale Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Nature of Operations and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover [Abstract] Cover [Abstract] Other Other Reserves [Member] Other Reserves [Member] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Greater than 10 years Investments, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Investments, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Hedging Relationship [Domain] Hedging Relationship [Domain] Total Liabilities and Shareholders' Equity Liabilities and Equity Goodwill and Other Intangible Assets - Net Intangible Asset, Including Goodwill, after Accumulated Amortization Number of other U.S.-based entities mentioned in class action lawsuit Loss Contingency, Claims Filed, Number Of Entities Loss Contingency, Claims Filed, Number Of Entities Stock Options Stock Options Share-Based Payment Arrangement, Option [Member] Amounts Reclassified to Net Earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Non-controlling Minority Interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Schedule of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Fair Value Asset Adjustment to Hedged Notes Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders' Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 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] Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Fixed-to-Floating Interest Rate Swap Fixed-to-Floating Interest Rate Swap [Member] Fixed-to-Floating Interest Rate Swap Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Trucking Trucking [Member] Trucking Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Long-term Debt (Note 7) Long-term Debt as of December 31, 2025 Long-term Portion Long-term Debt as of September 30, 2026, Long-term Portion Long-Term Debt and Lease Obligation Name Measure Name Accounts Payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Contingencies [Line Items] Contingencies [Line Items] Contingencies [Line Items] Current and Long Term Debt Instrument Debt Instrument [Line Items] Other Current Assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055 Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055 [Member] Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055 Short-term Investments (Note 9) Short-Term Investments Goodwill Impairment Impairment Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Fixed Rate Notes Due Between 2036 and 2040 Fixed Rate Notes Due Between 2036 and 2040 [Member] Fixed Rate Notes Due Between 2036 and 2040 Intermodal Intermodal [Member] Intermodal [Member] Debt Type [Axis] Debt Type [Axis] Debt Type Stock Plans and Share-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Company Selected Measure Amount Company Selected Measure Amount Number of reportable segments not disclosed flag Number Of Reportable Segments Not Disclosed Flag NumberOfReportableSegmentsNotDisclosedFlag Depreciation and Amortization Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Current Assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income Tax Expense Income Tax Expense (Benefit) Fair Value Hedging Fair Value Hedging [Member] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Income Statement Numerator: Net Income (Loss) Attributable to Parent [Abstract] Casualty, Environmental and Other Reserves (Note 4) Current Loss Contingency, Accrual, Current Share Repurchase Program October 2023 Share Repurchase Program October 2023 [Member] Share Repurchase Program October 2023 Amortization of Net Loss Defined Benefit Plan, Amortization of Gain (Loss) Fuel Fuel Fuel Costs Net Earnings Net Earnings Net Earnings Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Proceeds and Advances from Property Dispositions Proceeds from Sale of Property, Plant, and Equipment Restatement Determination Date: Restatement Determination Date [Axis] Exchange-traded Funds Exchange Traded Funds [Member] Schedule of Changes in the AOCI Balance by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative, term of contract Derivative, Contract Term Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Cost of Shares (Dollars in Millions) Payments for Repurchase of Common Stock, Excluding Excise Tax Payments for Repurchase of Common Stock, Excluding Excise Tax Casualty Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Movement, Debt Instruments [Roll Forward] Movement, Debt Instruments [Roll Forward] Movement, Debt Instruments [Roll Forward] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]