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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Data | Pursuant to Article 3 of the SEC’s Regulation S-X, the following are selected quarterly financial data:
Fiscal Year Ended December 2018 (a) | Quarters
(Dollars in Millions, Except Per Share Amounts) | 1st |  | 2nd |  | 3rd |  | 4th |  | Full Year
Revenue | $ | 2,876 |  |  | $ | 3,102 |  |  | $ | 3,129 |  |  | $ | 3,143 |  |  | $ | 12,250 |
Operating Income | 1,044 |  |  | 1,283 |  |  | 1,293 |  |  | 1,249 |  |  | 4,869 |
Net Earnings | 695 |  |  | 877 |  |  | 894 |  |  | 843 |  |  | 3,309 |
Earnings Per Share, Basic | $ | 0.78 |  |  | $ | 1.02 |  |  | $ | 1.05 |  |  | $ | 1.02 |  |  | $ | 3.86 |
Earnings Per Share, Assuming Dilution | 0.78 |  |  | 1.01 |  |  | 1.05 |  |  | 1.01 |  |  | 3.84 |
Fiscal Year Ended December 2017 (a) |  |  |  |  |  |  |  |  |
Revenue | $ | 2,869 |  |  | $ | 2,933 |  |  | $ | 2,743 |  |  | $ | 2,863 |  |  | $ | 11,408 |
Operating Income (c) | 769 |  |  | 957 |  |  | 868 |  |  | 1,126 |  |  | 3,720 |
Net Earnings (b) | 362 |  |  | 510 |  |  | 459 |  |  | 4,140 |  |  | 5,471 |
Earnings Per Share, Basic (b) | $ | 0.39 |  |  | $ | 0.55 |  |  | $ | 0.51 |  |  | $ | 4.63 |  |  | $ | 6.01 |
Earnings Per Share, Assuming Dilution (b) | 0.39 |  |  | 0.55 |  |  | 0.51 |  |  | 4.62 |  |  | 5.99 |
(a) Prior to third quarter 2017, CSX followed a 52/53 week fiscal reporting calendar and 2017 included 366 days. See Note 1, Nature of Operations and Significant Accounting Policies for details regarding the number of days in each quarterly period presented. (b) These results for fourth quarter and full year 2017 include a $3.6 billion, or $3.91 per share, net tax reform benefit. See further discussion in Note 11, Income Taxes. (c) Certain prior year data has been reclassified to conform to the current presentation. See further discussion of reclassification of all components of net periodic benefit cost except service cost from labor and fringe expense to other income - net in Note 1.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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