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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022
Active Employees2,767 
Retirees and Beneficiaries11,460 
Other(a)
3,586 
Total17,813 
(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
2023$193 
2024188 
2025185 
2026183 
2027181 
2028-2032879 
Total$1,809 
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 2022December 2021
  Percent of Percent of
(Dollars in Millions)AmountTotal AssetsAmountTotal Assets
Equity$1,249 54 %$1,559 52 %
Fixed Income144 6 204 7 
Cash and Cash Equivalents41 2 49 1 
Growth-Oriented$1,434 62 %$1,812 60 %
Fixed Income777 33 1,145 38 
Cash and Cash Equivalents116 5 59 2 
Immunizing$893 38 %$1,204 40 %
Total$2,327 100 %$3,016 100 %
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 2022 and 2021 plan years are as follows:

 Pension Benefits
 Plan YearPlan Year
(Dollars in Millions)20222021
Actuarial Present Value of Benefit Obligation  
Accumulated Benefit Obligation$2,285 $2,909 
Projected Benefit Obligation2,368 3,022 
Change in Projected Benefit Obligation:  
Projected Benefit Obligation at Beginning of Plan Year
$3,022 $3,257 
Service Cost (a)
36 45 
Interest Cost64 55 
Actuarial Gain(570)(142)
Benefits Paid(184)(193)
Benefit Obligation at End of Plan Year$2,368 $3,022 
Change in Plan Assets:  
Fair Value of Plan Assets at Beginning of Plan Year$3,016 $3,000 
Actual (Loss) Return on Plan Assets(523)187 
Non-qualified Employer Contributions18 22 
Benefits Paid(184)(193)
Fair Value of Plan Assets at End of Plan Year$2,327 $3,016 
Funded Status at End of Plan Year$(41)$(6)
(a)Service cost for 2022 and 2021 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)20222021
Amounts Recorded in Consolidated 
Balance Sheets:  
Long-term Assets$164 $255 
Current Liabilities(17)(17)
Long-term Liabilities(188)(244)
Net Amount Recognized in Consolidated Balance Sheets$(41)$(6)
Schedule of Benefit Obligations in Excess of Plan Assets
Long-term assets as of December 2022 and 2021 in the preceding table relate to qualified pension plans where assets exceed projected benefit obligations. Current and long-term liabilities relate to plans where projected benefits obligations exceed assets. The following table shows the value of plan assets for only those plans with a net liability status.
Aggregate
(Dollars in Millions)Fair ValueAggregate
Benefit Obligations in Excess of Plan Assetsof Plan AssetsBenefit Obligation
Projected Benefit Obligation$— $(205)
Accumulated Benefit Obligation— (195)
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)202220212020
Service Cost Included in Labor and Fringe$32 $41 $43 
Interest Cost64 55 82 
Expected Return on Plan Assets(188)(186)(176)
Amortization of Net Loss50 73 54 
Total Income Included in Other Income - Net$(74)$(58)$(40)
Net Periodic Benefit (Credit)/Cost$(42)$(17)$3 
Settlement Loss (Gain)1 — (1)
Total Periodic Benefit (Credit)/Cost$(41)$(17)$2 
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)20222021
Recognized in the Balance Sheet  
Losses (Gains) $141 $(143)
Expense Recognized in the Income Statement
Amortization of Net Losses$50 $73 
Settlement Loss1 — 
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
 20222021
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 Year2.98 %2.69 %
Interest Cost for Plan Year2.18 %1.70 %
Benefit Obligation at End of Plan Year5.02 %2.78 %
Salary Scale Inflation4.80 %4.60 %
Cash Balance Plan Interest Credit Rate3.75 %3.75 %