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Stock Plans and Share-Based Compensation (Long-term Incentive Plans) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 25, 2015 USD ($) plan $ / shares shares | Dec. 26, 2014 USD ($) | Dec. 27, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total (benefit) expense | $ |  | $ 12 | $ 33 | $ 14
Long-term Incentive Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of payout subject to reduction (up to) |  | 30.00% |  |
Total (benefit) expense | $ |  | $ (1) | $ 19 | $ 2
Long-term Incentive Plans [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 0.00% |  |
Long-term Incentive Plans [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 200.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 200.00% |  |
Performance Units [Member] | Long-term Incentive Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance unit equivalent of CSX stock, in shares |  | 1 |  |
Plan duration |  | 3 years |  |
Number of plans | plan |  | 3 |  |
Payout percentage cumulative period |  | 3 years |  |
Percentage payout on operating ratio |  | 50.00% |  |
Percentage payout on average return on assets |  | 50.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Number of target units outstanding | [1] | 1,317,000 |  |
Weighted-average fair value at grant date (dollars per share) | $ / shares | [1] | $ 25.90 |  |
Performance Units [Member] | Long Term Incentive Plan - 2014 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 0.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2014 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 200.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 200.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Number of target units outstanding | [1] | 1,115,000 |  |
Weighted-average fair value at grant date (dollars per share) | $ / shares | [1] | $ 28.60 |  |
Performance Units [Member] | Long Term Incentive Plan - 2015 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 0.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2015 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 200.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 200.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2016 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Number of target units outstanding | [1] | 826,000 |  |
Weighted-average fair value at grant date (dollars per share) | $ / shares | [1] | $ 35.94 |  |
Performance Units [Member] | Long Term Incentive Plan - 2016 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 0.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 0.00% |  |
Performance Units [Member] | Long Term Incentive Plan - 2016 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout Range |  | 200.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |
Payout Range |  | 200.00% |  |
[1] | Number of target units granted and weighted-average fair value calculations above include the value of both initial grants and subsequent, smaller grants issued at different prices based on grant date fair value to new or promoted employees not previously included.

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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 The number of outstanding awards on nonstock option plans (for example, restricted stock plan, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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