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Share-Based Compensation - Narrative (Details) - $ / shares |  | 6 Months Ended
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Feb. 10, 2016 | Jun. 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options granted (in shares) |  | 2,400,000
Fair value of stock options (in dollars per share) |  | $ 4.68
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period |  | 3 years
Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period |  | 3 years
Term of stock options |  | 10 years
2016 - 2018 LTIP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of payout subject to downward adjustment (up to) |  | 30.00%
2016 - 2018 LTIP | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Payout range for participants |  | 0.00%
2016 - 2018 LTIP | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Payout range for participants |  | 200.00%
2016 - 2018 LTIP | Performance Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) |  | 839,000
Percentage of grants with performance vesting, operating ratio | 50.00% |
Percentage of grants with performance vesting, return on assets | 50.00% |
Performance unit equivalent of CSX common stock (in shares) | 1 |
2016 - 2018 LTIP | Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) |  | 419,000

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- Definition Share Based Compensation Arrangement by Share Base Payment Award Number of Equivalent Shares of Common Stock Per Unit (e.g. performance units, restricted stock units, etc.). + References No definition available. + Details
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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=6415400&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=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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