Stock Plans and Share-Based Compensation - Narrative (Details) |
6 Months Ended |
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Jun. 30, 2026
shares
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| Performance Units | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Award vesting period (in years) | 3 years |
| Return on invested capital, weight (ROIC) | 60.00% |
| Relative total shareholder return, weight (rTSR) | 40.00% |
| Payout percentage grant value | 100.00% |
| Maximum return on invested capital, weight (ROIC) | 120.00% |
| Maximum relative total shareholder return, weight (rTSR) | 80.00% |
| Maximum payout percentage | 200.00% |
| Stock Options | Long-term Incentive Plan | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Award vesting period (in years) | 3 years |
| Award term (in years) | 10 years |
| Performance Units | Long-term Incentive Plan | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Award vesting period (in years) | 3 years |
| Number of equivalent shares of CSX common stock per unit of award (in shares) | 1 |
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Payout Percentage No definition available.
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Maximum Relative Total Shareholder Return, Weight No definition available.
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Maximum Return On Invested Capital, Weight No definition available.
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Payout Percentage Grant Value No definition available.
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Relative Total Shareholder Return, Weight No definition available.
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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other than Options, Return On Invested Capital, Weight No definition available.
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Equivalent Shares of Common Stock Per Unit No definition available.
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Period from grant to expiration date of share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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