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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2017 employee shares | Mar. 31, 2017 $ / shares shares | Feb. 28, 2017 $ / shares shares | Sep. 30, 2017 shares | Sep. 23, 2016 shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 23, 2016 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options granted (in shares) |  |  | 1,300,000 | 0 | 0 |  |
Fair value of stock options (in dollars per share) | $ / shares |  |  | $ 12.54 |  |  | $ 12.83 | $ 4.68
Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options granted (in shares) |  | 9,000,000 |  |  |  |  |
Fair value of stock options (in dollars per share) | $ / shares |  | $ 12.88 |  |  |  |  |
Chief Executive Officer | Vesting Upon Service Anniversary |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of vesting options (in shares) |  | 4,500,000 |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |
Chief Executive Officer | Vesting Upon Achievement of Performance Targets |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of vesting options (in shares) | 4,500,000 |  |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |  |  |
2017 - 2019 LTIP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of payout subject to downward adjustment (up to) |  |  |  |  |  | 30.00% |
2017 - 2019 LTIP | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout range for participants (as a percent) |  |  |  |  |  | 0.00% |
2017 - 2019 LTIP | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout range for participants (as a percent) |  |  |  |  |  | 200.00% |
Equity Award Modifications |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of employees impacted (employees) | employee | 70 |  |  |  |  |  |
Share-based compensation expense revaluation of awards | $ |  |  |  |  |  | $ 31 |
Performance Units | 2017 - 2019 LTIP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards granted (in shares) |  |  | 600,000 |  |  |  |
Percentage of grants with performance vesting, operating ratio (as a percent) |  |  |  |  |  | 50.00% |
Percentage of grants with performance vesting, return on assets (as a percent) |  |  |  |  |  | 50.00% |
Performance unit equivalent of CSX common stock (in shares) |  |  |  |  |  | 1 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) | 2017 - 2019 LTIP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards granted (in shares) |  |  | 300,000 |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
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 |  |  |  |
Employee Stock Option | Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Term of stock options (in years) |  | 10 years |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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