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Debt and Credit Agreements
 3 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Debt and Credit Agreements Debt and Credit Agreements
Total activity related to long-term debt as of the end of first quarter 2025 is shown in the table below. For fair value information related to the Company's long-term debt, see Note 9, Fair Value Measurements.

(Dollars in Millions)
Current PortionLong-term PortionTotal
Long-term Debt as of December 31, 2024
$606 $17,897 $18,503 
2025 Activity:
Long-term Debt Issued— 600 600 
Long-term Debt Repaid(2)— (2)
Reclassifications1 (1)— 
Hedging, Discount, Premium and Other Activity— 25 25 
Long-term Debt as of March 31, 2025
$605 $18,521 $19,126 

Debt Issuance
On March 10, 2025, CSX issued $600 million of 5.05% notes due 2035. These notes are included in the consolidated balance sheets under long-term debt and may be redeemed by the Company at any time, subject to payment of certain make-whole premiums. The net proceeds will be used for general corporate purposes, which may include debt repayments, repurchases of CSX's common stock, capital investment and working capital requirements.

Interest Rate Derivatives
Fair Value Hedges
In first quarter 2025, CSX entered into two fixed-to-floating interest rate swaps classified as fair value hedges. The swaps are designed to hedge 10 years of interest rate risk associated with market fluctuations attributable to the Secured Overnight Financing Rate ("SOFR") on a cumulative $250 million of fixed rate outstanding notes which are due in 2055. The cumulative fair value of these swaps, which is included in other long-term assets on the consolidated balance sheet, was an asset of $8 million as of March 31, 2025.

CSX has seven other fixed-to-floating interest rate swaps classified as fair value hedges. The swaps are designed to hedge 10 years of interest rate risk associated with market fluctuations attributable to SOFR on a cumulative $1.1 billion of fixed rate outstanding notes which are due between 2033 and 2040. These swaps are comprised of two swaps entered during 2023 (“2023 swaps”) and five swaps entered during 2022 (“2022 swaps”). The cumulative fair value of the 2023 swaps was an asset of $12 million and $7 million as of March 31, 2025, and December 31, 2024, respectively, and is included in other long-term assets on the consolidated balance sheet. The cumulative fair value of the 2022 swaps was a liability of $110 million and $123 million as of March 31, 2025, and December 31, 2024, respectively, and is included in other long-term liabilities on the consolidated balance sheet.
NOTE 7.    Debt and Credit Agreements, continued

The swaps expire between 2032 and 2035. If settled early, the remaining cumulative fair value adjustment to the hedged notes will be amortized over the remaining life of the associated notes. The cumulative adjustment to the hedged notes is included in long-term debt on the consolidated balance sheet as shown in the following table below.
(Dollars in Millions)March 31, 2025December 31, 2024
Notional Value of Hedged Notes$1,300 $1,050 
Fair Value Asset Adjustment to Hedged Notes20 7 
Fair Value Liability Adjustment to Hedged Notes(110)(123)
Carrying Amount of Hedged Notes$1,210 $934 

Gains and losses resulting from changes in fair value of the interest rate swaps offset changes in the fair value of the hedged portion of the underlying debt with no gain or loss recognized due to hedge ineffectiveness. The difference in the net fixed-to-float interest settlement on the derivatives is recognized in interest expense and is summarized as follows.

First Quarters
(Dollars in Millions)20252024
Interest Expense Impact (Increase) Decrease$(5)$(8)

Cash Flow Hedges
The Company had forward starting interest rate swaps, designated as cash flow hedges in accordance with the Derivatives and Hedging Topic in the ASC, that had an aggregate notional value of $500 million at inception. These swaps were effected to hedge the benchmark interest rate associated with future interest payments related to the anticipated refinancing of $850 million of 3.25% notes due in 2027.

In addition to previous partial settlements in 2022 and 2023, CSX executed a final settlement equal to $114 million of the $500 million aggregate notional value of the cash flow hedges in second quarter 2024, which resulted in CSX receiving a cash payment of $52 million included in other operating activities on the consolidated cash flow statement. As of March 31, 2025, and December 31, 2024, no unsettled aggregate notional value of these swaps remains and there is no related asset or liability.

The unrealized gain associated with the settled portion of the swaps is recorded net of tax in accumulated other comprehensive income ("AOCI") on the consolidated balance sheet and will continue to be classified in AOCI until the associated debt instrument is issued in the future. The unrealized gain in AOCI will be recognized in earnings as an adjustment to interest expense over the same period during which the hedged transaction affects earnings. Prior to full settlement, unrealized gains related to the swaps were included in other comprehensive income as summarized in the table below.

First Quarters
(Dollars in Millions)20252024
Unrealized Gain - Net of Tax
$— $2 
See Note 9, Fair Value Measurements, and Note 10, Other Comprehensive Income (Loss), for additional information about the Company's swaps.
NOTE 7.    Debt and Credit Agreements, continued

Credit Facility
The Company has a $1.2 billion unsecured revolving credit facility backed by a diverse syndicate of banks. This facility allows same-day borrowings at floating interest rates, based on SOFR or an agreed-upon replacement reference rate, plus a spread that depends upon CSX's senior unsecured debt ratings. This facility expires in February 2028. As of March 31, 2025, the Company had no outstanding balances under this facility.

Commitment fees and interest rates payable under the facility were similar to fees and rates available to comparably rated investment-grade borrowers. As of first quarter 2025, CSX was in compliance with all covenant requirements under this facility.

Commercial Paper
Under its commercial paper program, which is backed by the revolving credit facility, the Company may issue unsecured commercial paper notes up to a maximum aggregate principal amount of $1.0 billion outstanding at any one time. Proceeds from issuances of the notes are expected to be used for general corporate purposes. At March 31, 2025, the Company had no outstanding debt under the commercial paper program.