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Share-Based Compensation - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 | Feb. 28, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 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) |  |  | $ 20.51 |  | $ 17.62 | $ 18.00 | $ 14.64
LTIP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options granted (in shares) |  | 843,000 |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
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) |  |  | 0 | 105,000 |  |  |
Weighted average purchase price of shares issued (in dollars per share) |  |  |  | $ 52.81 |  |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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