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Stock Plans and Share-Based Compensation - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 | Feb. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
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) |  |  |  | $ 15.44 | $ 18.87 | $ 17.99
LTIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted (in shares) |  | 1,300,000 | 0 |  |  |
Fair value of stock options on the date of grant (in dollars per share) |  | $ 18.88 |  |  |  |
LTIP | Performance Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
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 |  |  |  |
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 Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted (in shares) |  | 218,000 |  |  |  |
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 |  | 250.00% |  |  |  |
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) |  | 91,000 |  |  |  |
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 |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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