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Stock Plans and Share-Based Compensation - Narrative (Details) | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2018 USD ($) shares
Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost |  | $ 2,000,000 |  |  |
Expected weighted average period of recognition for unrecognized compensation cost (in years) |  | 1 year |  |  |
Look-back period |  | 2 years 10 months 24 days | 2 years 9 months 18 days | 2 years 10 months 24 days |
Restricted Stock Units and Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost |  | $ 9,000,000 |  |  |
Expected weighted average period of recognition for unrecognized compensation cost (in years) |  | 2 years |  |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 5 years |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost |  | $ 18,000,000 |  |  |
Expected weighted average period of recognition for unrecognized compensation cost (in years) |  | 2 years |  |  |
Look-back period |  | 6 years | 6 years 1 month 6 days | 6 years 6 months |
Non-management Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual retainer to be paid to non-management directors, common stock option |  | $ 162,500 |  |  |
Chairman |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual grant of common stock amount |  | $ 250,000 |  |  |
LITP | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payout range (as a percent) |  | 0.00% |  |  |
LITP | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payout range (as a percent) |  | 200.00% |  |  |
LITP | Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of equivalent shares of CSX common stock per unit of award (in shares) | shares |  | 1 |  |  |
Award performance period |  | 3 years |  |  |
Number of long term incentive plans | plan |  | 3 |  |  |
LITP | Restricted Stock Units and Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance unit equivalent of CSX stock (in shares) | shares |  | 1 |  |  |
LITP | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance unit equivalent of CSX stock (in shares) | shares |  | 1 |  |  |
LITP | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award term |  | 10 years |  |  |
LITP | Stock Options | Vesting on anniversary of the grant date (graded period) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years | 3 years |  |
LITP | Stock Options | Vesting after the grant date (cliff period) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years | 3 years | 3 years |
2020-2022 LTIP | Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years |  |  |
Percentage payout on operating ratio |  | 50.00% |  |  |
2020-2022 LTIP | Certain Executive Officers | Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 25.00% |  |  |
2020-2022 LTIP | Certain Executive Officers | Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 250.00% |  |  |
2019-2021 LTIP | Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years |  |  |
Percentage payout on operating ratio |  | 50.00% |  |  |
2019-2021 LTIP | Certain Executive Officers | Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 25.00% |  |  |
2019-2021 LTIP | Certain Executive Officers | Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 250.00% |  |  |
2018-2020 LTIP | Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 3 years |  |  |
Percentage payout on operating ratio |  | 50.00% |  |  |
2018-2020 LTIP | Certain Executive Officers | Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 25.00% |  |  |
2018-2020 LTIP | Certain Executive Officers | Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of payout subject to adjustment |  | 200.00% |  |  |
Non-management Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual retainer to be paid to non-management directors, cash option |  | $ 112,500 |  |  |
ESPP | Employee Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of registered shares of common stock that my be issued pursuant to plan (in shares) | shares |  |  |  |  | 4,000,000
Employee contribution percentage, minimum |  |  |  |  | 1.00%
Employee contribution percentage, maximum |  |  |  |  | 10.00%
Maximum value of stocks purchased by employee, after tax |  |  |  |  | $ 25,000
Percentage of share closing market price | 85.00% |  |  |  |
Share offering period | 6 months |  |  |  |

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