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Share-Based Compensation - Narrative (Details) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 06, 2019 | May 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of stock options on the date of grant (in dollars per share) |  |  | $ 17.45 | $ 14.62
LTIP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) | 843,000 |  |  | 950,000
Fair value of stock options on the date of grant (in dollars per share) | $ 17.45 |  |  |
LTIP | Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards granted (in shares) | 300,000 |  |  | 350,000
Percentage of grants with performance vesting, operating ratio |  |  | 50.00% |
Percentage of grants with performance vesting, cumulative free cash flow |  |  | 50.00% |
Number of equivalent shares of CSX common stock per unit of award (in shares) | 1 |  | 1 |
LTIP | Performance Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage range for participants |  |  | 0.00% |
LTIP | Performance Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage range for participants |  |  | 200.00% |
LTIP | Performance Units | Certain Executive Officers |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of payout subject to downward adjustment (up to) |  |  | 25.00% |
LTIP | Performance Units | Certain Executive Officers | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage range for participants |  |  | 225.00% |
LTIP | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of stock options (in years) | 10 years |  |  |
Award vesting period (in years) | 3 years |  |  |
LTIP | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards granted (in shares) | 65,000 |  |  | 85,000
Number of equivalent shares of CSX common stock per unit of award (in shares) | 1 |  |  |
Award vesting period (in years) | 3 years |  |  |
ESPP | Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock registered for ESPP (in shares) |  | 4,000,000 |  |
Minimum payroll deduction percentage |  | 1.00% |  |
Maximum payroll deduction percentage |  | 10.00% |  |
Maximum stock value available for purchase |  | $ 25,000 |  |
Percentage of shares market price |  | 85.00% |  |
Share offering period |  | 6 months |  |
Shares issued under the plan during the period (in shares) |  |  | 105,000 |
Weighted average purchase price of shares issued (in dollars per share) |  |  | $ 52.81 |

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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. + References No definition available. + Details
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