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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Summary of Participants In order to perform this valuation, the actuaries are provided with the details of the population covered at the beginning of the year, summarized in the table below, and projects that population forward to the end of the year.
As of
Pension Plan Participants:January 1, 2023
Active Employees2,479 
Retirees and Beneficiaries11,294 
Other(a)
3,504 
Total17,277 
(a) The Other category consists mostly of terminated but vested former employees.
Schedule of Future Expected Benefit Payments Future expected benefit payments are as follows:
Expected Cash Flows (Dollars in Millions):
Pension Benefits
2024$190 
2025186 
2026183 
2027182 
2028181 
2029-2033870 
Total$1,792 
Schedule of Allocation of Plan Assets
The distribution of pension plan assets as of the measurement date is shown in the table below, and these assets are reported net of pension liabilities on the balance sheet.

 December 2023December 2022
  Percent of Percent of
(Dollars in Millions)AmountTotal AssetsAmountTotal Assets
Equity$1,142 47 %$1,249 54 %
Fixed Income114 4 144 6 
Cash and Cash Equivalents15 1 41 2 
Growth-Oriented$1,271 52 %$1,434 62 %
Fixed Income911 38 777 33 
Cash and Cash Equivalents240 10 116 5 
Immunizing$1,151 48 %$893 38 %
Total$2,422 100 %$2,327 100 %
Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets
Changes in benefit obligation and the fair value of plan assets for the 2023 and 2022 plan years are as follows:

 Pension Benefits
 Plan YearPlan Year
(Dollars in Millions)20232022
Actuarial Present Value of Benefit Obligation  
Accumulated Benefit Obligation$2,252 $2,285 
Projected Benefit Obligation2,343 2,368 
Change in Projected Benefit Obligation:  
Projected Benefit Obligation at Beginning of Plan Year
$2,368 $3,022 
Service Cost (a)
28 36 
Interest Cost111 64 
Actuarial Loss (Gain)20 (570)
Benefits Paid(184)(184)
Benefit Obligation at End of Plan Year$2,343 $2,368 
Change in Plan Assets:  
Fair Value of Plan Assets at Beginning of Plan Year$2,327 $3,016 
Actual Return (Loss) on Plan Assets259 (523)
Non-qualified Employer Contributions20 18 
Benefits Paid(184)(184)
Fair Value of Plan Assets at End of Plan Year$2,422 $2,327 
Funded Status at End of Plan Year$79 $(41)
(a)Service cost for 2023 and 2022 includes capitalized service costs of $4 million each year.
Schedule of Amount Recognized in Balance Sheet Amounts related to pension benefits recorded in other long-term assets, labor and fringe benefits payable and other long-term liabilities on the balance sheet are as follows:
 Pension Benefits
 DecemberDecember
(Dollars in Millions)20232022
Amounts Recorded in Consolidated 
Balance Sheets:  
Long-term Assets$277 $164 
Current Liabilities(16)(17)
Long-term Liabilities(182)(188)
Net Amount Recognized in Consolidated Balance Sheets$79 $(41)
Schedule of Benefit Obligations in Excess of Plan Assets The following table shows the value of plan assets for only those plans with a net liability status.
Aggregate
(Dollars in Millions)Fair ValueAggregate
Benefit Obligations in Excess of Plan Assetsof Plan AssetsBenefit Obligation
Projected Benefit Obligation$— $(198)
Accumulated Benefit Obligation— (188)
Schedule of Net Benefit Expense Recorded on the Income Statement The following table describes the components of expense/(income) related to net benefit expense recorded on the income statement.
Pension Benefits
Years Ended
(Dollars in Millions)202320222021
Service Cost Included in Labor and Fringe$24 $32 $41 
Interest Cost111 64 55 
Expected Return on Plan Assets(164)(188)(186)
Amortization of Net Loss29 50 73 
Total Income Included in Other Income - Net$(24)$(74)$(58)
Net Periodic Benefit Cost (Credit)
$— $(42)$(17)
Settlement Loss— 1 — 
Total Periodic Benefit Cost (Credit)
$— $(41)$(17)
Schedule of Pre-tax Change in Other Comprehensive Loss (Income)
The following table shows the pre-tax change in other comprehensive loss (income) attributable to certain components of net benefit expense and the change in benefit obligation for CSX for pension benefits.

(Dollars in Millions)Pension Benefits
Components of Other ComprehensiveYears Ended
Loss (Income)20232022
Recognized in the Balance Sheet  
(Gains) Losses$(75)$141 
Expense Recognized in the Income Statement
Amortization of Net Losses$29 $50 
Settlement Loss— 1 
Schedule of Weighted-Average Assumptions Used The weighted averages of assumptions used by the Company to value its pension obligations were as follows:
 Pension Benefits
 20232022
Expected Long-term Return on Plan Assets:  
Benefit Cost for Current Plan Year6.75 %6.75 %
Benefit Cost for Subsequent Plan Year6.75 %6.75 %
Discount Rates:  
Benefit Cost for Plan Year
Service Cost for Plan Year5.09 %2.98 %
Interest Cost for Plan Year4.90 %2.18 %
Benefit Obligation at End of Plan Year4.82 %5.02 %
Salary Scale Inflation4.80 %4.80 %
Cash Balance Plan Interest Credit Rate3.75 %3.75 %