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Stock Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation and Related Income Tax Benefit Total pre-tax expense and income tax benefits associated with share-based compensation are shown in the table below. Income tax benefits include impacts from option exercises and the vesting of other equity awards.
 Years Ended
(Dollars in Millions)202520242023
Share-Based Compensation Expense
Restricted Stock Units$26 $28 $19 
Stock Options14 12 12 
Employee Stock Purchase Plans10 8 7 
Stock Awards for Directors3 2 2 
Performance Units1 (10)20 
Total Share-based Compensation Expense$54 $40 $60 
Income Tax Benefit$13 $13 $14 
Schedule of Assumptions and Inputs Used to Estimate Fair Value of Performance Units
The fair values of the performance units granted during the years ended December 2025, 2024 and 2023 for awards with total shareholder return components were calculated using a Monte-Carlo simulation model. Performance unit grants were valued using the following weighted-average assumptions:

Years Ended
Weighted-Average Assumptions Used:202520242023
Risk-free Interest Rate4.1 %4.4 %4.4 %
Annualized Volatility23.3 %23.3 %33.2 %
Expected Life (in years)
2.72.92.8
Schedule of Performance Unit Grant and Vesting Information
Performance unit grant and vesting information is summarized as follows:
 Years Ended
 202520242023
Weighted-Average Fair Value of Units Granted$34.02 $38.66 $31.57 
Fair Value of Units Vested (in Millions)
$21 $22 $16 
Schedule of Performance Unit Activity Related to Outstanding Long-term Incentive Plans and Corresponding Fair Value
The performance unit activity related to the outstanding long-term incentive plans and corresponding fair value is summarized as follows:
 Performance Units Outstanding
(in Thousands)		Weighted-Average Fair Value at Grant Date
Unvested at December 31, 2024
1,279 $35.47 
Granted 852 34.02 
Forfeited (325)35.42 
Vested (652)32.55 
Unvested at December 31, 2025
1,154 $36.10 
Schedule of Assumptions and Inputs Used to Estimate Fair Value of Stock Options
Assumptions and inputs used to estimate fair value of stock options are summarized as follows:
Years Ended
 202520242023
Weighted-Average Fair Value of Units Granted$9.47$11.58$9.82
Stock Options Valuation Assumptions:
Annual Dividend Yield1.5 %1.3 %1.4 %
Risk-free Interest Rate4.1 %4.2 %3.8 %
Annualized Volatility26.6 %28.7 %29.6 %
Expected Life (in Years)6.06.06.0
Other Pricing Model Inputs:
Weighted-average Grant-date Market Price of CSX Stock (Strike Price)$33.94$36.73$31.54
Schedule of Stock Option Activity
The stock option activity is summarized as follows:
 Stock Options Outstanding
(in Thousands)		Weighted-Average Exercise PriceWeighted-Average Remaining Contractual Life
(in Years)		Aggregate Intrinsic Value
(in Millions)
Outstanding at December 31, 20249,531 $27.40 
Granted 1,785 33.93 
Forfeited (456)34.38 
Exercised(1,131)18.90 
Outstanding at December 31, 20259,729 $29.26 5.3$68 
Exercisable at December 31, 20257,195 $27.46 4.6$63 
Schedule of Intrinsic Value and Cash Proceeds of Options Exercises Additional information on stock option exercises is summarized as follows:
Years Ended
(Dollars in Millions)202520242023
Intrinsic Value of Stock Options Exercised$18 $45 $27 
Cash Received from Option Exercises$21 $79 $52 
Schedule of Restricted Stock Grant and Vesting Information Restricted stock unit grant and vesting information is summarized as follows:
 Years Ended
 202520242023
Weighted-Average Fair Value of Units Granted$33.16 $36.86 $31.46 
Fair Value of Units Vested (in Millions)
$39 $23 $8 
Schedule of Outstanding Restricted Stock Units and Awards
The restricted stock activity related to the outstanding long-term incentive plans and other awards and corresponding fair value is summarized as follows:
 Restricted Stock Units Outstanding
(in Thousands)		Weighted-Average Fair Value at Grant Date
Unvested at December 31, 2024
1,990 $34.01 
Granted801 33.16 
Forfeited (165)34.10 
Vested (1,151)33.55 
Unvested at December 31, 2025
1,475 $33.91 
Schedule of Shares Issued under Employee Stock Purchase Plan During 2025, 2024 and 2023, the Company issued the following shares under this program:
 Years Ended
 202520242023
Shares Issued (in Thousands)
1,317 1,012 959 
Weighted Average Purchase Price Per Share$27.38 $28.79 $25.66