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Nature of Operations and Significant Accounting Policies (Policies)
 3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Basis of Presentation
Basis of Presentation
In the opinion of management, the accompanying consolidated financial statements contain all normal, recurring adjustments necessary to fairly present the consolidated financial statements and accompanying notes. Where applicable, prior year information has been reclassified to conform to the current presentation. Pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been omitted from these interim financial statements. CSX suggests that these financial statements be read in conjunction with the audited financial statements and the notes included in CSX's most recent annual report on Form 10-K and any subsequently filed current reports on Form 8-K.
Fiscal Year
Fiscal Year
The Company's fiscal periods are based upon the calendar year. Except as otherwise specified, references to “first quarter(s)” or “three months” indicate CSX's fiscal periods ending March 31, 2025 and March 31, 2024, and references to "year-end" indicate the fiscal year ended December 31, 2024.
New Accounting Pronouncements
New Accounting Pronouncements
In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures. This standard update requires additional interim and annual disclosures about a company’s income taxes, including more detailed information around the annual rate reconciliation and income taxes paid. The Company is required to adopt the guidance for its 2025 annual report filed on Form 10-K, though early adoption is permitted. The Company is currently evaluating the impact of these amendments on its disclosures, but this standard update will not impact the Company's results of operations or financial position.

In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses. This standard update requires additional disclosures about certain expenses in commonly presented expense captions. The Company is required to adopt the guidance for its 2027 annual report filed on Form 10-K, though early adoption is permitted. The Company is currently evaluating the impact of these amendments on its disclosures, but this standard update will not impact the Company's results of operations or financial position.
Revision of Prior Period Financial Statements
Revision of Prior Period Financial Statements
During second quarter 2024, CSX completed a review of the accounting treatment for engineering scrap and certain engineering support labor and identified misstatements between the balance sheet and operating expense in previously issued financial statements. In accordance with the Accounting Standards Codification (“ASC”) Topic 250, Accounting Changes and Error Corrections, the Company evaluated the materiality of the errors on the previously presented financial statements and determined that they did not result in a material misstatement to the financial condition, results of operations, or liquidity for any of the impacted periods. However, the Company determined that the effect of recording the misstatements during the second quarter of 2024 would be material to the annual 2024 consolidated financial statements. As a result, the Company revised its previously issued consolidated financial statements. For comparative purposes, the Company has also made corrections to the consolidated financial statements and applicable notes for the first quarter 2024 results presented in this Form 10-Q. See the 2024 annual report filed on Form 10-K for additional information and quantification of prior period restatement impacts.
Compensation Related Costs, Policy Under CSX's share-based compensation plans, awards consist of performance units, stock options and restricted stock units for management and stock grants for directors. Share-based compensation expense for awards under share-based compensation plans is measured using the fair value of the award on the grant date and is recognized on a straight-line basis over the service period of the respective award. Alternatively, expense is recognized upon death or over an accelerated service period for employees whose agreements allow for continued vesting upon retirement or separation. Forfeitures are recognized as they occur.
Revenue Recognition The Company maintains an allowance for credit losses to provide for the estimated amount of receivables that will not be collected. The allowance is based upon an assessment of risk characteristics, historical payment experience, and the age of outstanding receivables adjusted for forward-looking economic conditions as necessary.
Fair Value Measurements
Investments
The Company's investment assets are carried at fair value on the consolidated balance sheet in accordance with the Fair Value Measurements and Disclosures Topic in the ASC. They are valued with assistance from a third-party trustee and consist of exchange-traded funds, corporate bonds, asset-backed securities, government securities, and short-term time deposits. The exchange-traded funds are valued at quoted market prices determined in an active market, which are Level 1 inputs.

The corporate bonds, asset-backed securities and government securities are valued using broker quotes that utilize observable market inputs, which are Level 2 inputs. The carrying amounts of time deposits, which are reported in the consolidated balance sheet using Level 2 inputs, approximate fair value due to their short-term nature. Unrealized losses as of March 31, 2025 and March 31, 2024 were not material. The Company believes any impairment of investments held with gross unrealized losses to be temporary and not the result of credit risk.
Long-term Debt
Long-term debt is reported at carrying amount on the consolidated balance sheets and is the Company's only financial instrument with fair values significantly different from their carrying amounts. The fair value of a company's debt is a measure of its current value under present market conditions, but does not impact the financial statements under current accounting rules. The majority of the Company's long-term debt is valued with assistance from a third party that utilizes closing transactions, market quotes or market values of comparable debt. For those instruments not valued by the third party, the fair value has been estimated by applying market rates of similar instruments to the scheduled contractual debt payments and maturities. These market rates are provided by the same third party. All of the inputs used to determine the fair value of the Company's long-term debt are Level 2 inputs.
Interest Rate Derivatives
The Company’s fixed-to-floating swaps are carried at fair value, which is determined with assistance from a third party based upon pricing models using inputs observed from actively quoted markets. All of the inputs used to determine the fair value of the swaps are Level 2 inputs.