Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2024

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, 2024
Active Employees	2,314
Retirees and Beneficiaries	11,105
Terminated Vested and Other	3,327
Total	16,746

Schedule of Future Expected Benefit Payments

Future expected benefit payments are as follows:

Expected Cash Flows (Dollars in Millions):	Pension Benefits
2025	$	190
2026	185
2027	184
2028	182
2029	181
2030-2034	869
Total	$	1,791

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 2024				December 2023 (a)
			Percent of				Percent of
(Dollars in Millions)	Amount		Total Assets		Amount		Total Assets
Equity	$	709	29	%	$	1,182	48	%
Fixed Income	57		3		117		4
Cash and Cash Equivalents	18		1		14		1
Growth-Oriented	$	784	33	%	$	1,313	53	%
Fixed Income	1,129		46		916		37
Cash and Cash Equivalents	496		21		236		10
Immunizing	$	1,625	67	%	$	1,152	47	%
Total	$	2,409	100	%	$	2,465	100	%

(a) See Note 20, Revision of Prior Period Financial Statements.

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 2024 and 2023 plan years are as follows:

	Pension Benefits
	Plan Year		Plan Year
(Dollars in Millions)	2024		2023 (a)
Actuarial Present Value of Benefit Obligation
Accumulated Benefit Obligation	$	2,115	$	2,252
Projected Benefit Obligation	2,192		2,343
Change in Projected Benefit Obligation:
Projected Benefit Obligation at Beginning of Plan Year	$	2,343	$	2,368
Service Cost (b)	27		28
Interest Cost	106		111
Actuarial (Gain) Loss	(107)		20
Benefits Paid	(177)		(184)
Benefit Obligation at End of Plan Year	$	2,192	$	2,343
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Plan Year	$	2,465	$	2,299
Actual Return on Plan Assets	104		330
Non-qualified Employer Contributions	17		20
Benefits Paid	(177)		(184)
Fair Value of Plan Assets at End of Plan Year	$	2,409	$	2,465
Funded Status at End of Plan Year	$	217	$	122

(a)See Note 20, Revision of Prior Period Financial Statements.

(b)Service cost for 2024 and 2023 includes capitalized service costs of $3 million and $4 million, respectively.

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
	December		December
(Dollars in Millions)	2024		2023 (a)
Amounts Recorded in Consolidated
Balance Sheets:
Long-term Assets	$	403	$	320
Current Liabilities	(17)		(16)
Long-term Liabilities	(169)		(182)
Net Amount Recognized in Consolidated Balance Sheets	$	217	$	122

(a) See Note 20, Revision of Prior Period Financial Statements.

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)	2024		2023		2022
Service Cost Included in Labor and Fringe	$	24	$	24	$	32
Interest Cost	106		111		64
Expected Return on Plan Assets	(168)		(164)		(188)
Amortization of Net Loss	18		29		50
Total Income Included in Other Income - Net	$	(44)	$	(24)	$	(74)
Net Periodic Benefit Credit	$	(20)	$	—	$	(42)
Settlement Loss	—		—		1
Total Periodic Benefit Credit	$	(20)	$	—	$	(41)

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 Comprehensive	Years Ended
Loss (Income)	2024		2023 (a)
Recognized in the Balance Sheet
Gains	$	(42)	$	(146)
Expense Recognized in the Income Statement
Amortization of Net Losses	$	18	$	29

(a) See Note 20, Revision of Prior Period Financial Statements.

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
	2024		2023
Expected Long-term Return on Plan Assets:
Benefit Cost for Current Plan Year	6.75	%	6.75	%
Benefit Cost for Subsequent Plan Year	6.75	%	6.75	%
Discount Rates:
Benefit Cost for Plan Year
Service Cost for Plan Year	4.90	%	5.09	%
Interest Cost for Plan Year	4.72	%	4.90	%
Benefit Obligation at End of Plan Year	5.50	%	4.82	%
Salary Scale Inflation	4.80	%	4.80	%
Cash Balance Plan Interest Credit Rate	3.75	%	3.75	%