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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-Based Compensation and Related Income Tax Benefit | Total pre-tax expense and income tax benefits associated with share-based compensation are shown in the table below. Income tax benefits include impacts from option exercises and the vesting of other equity awards.
| First Quarters
(Dollars in millions) | 2019 | 2018
Share-Based Compensation Expense: |  |
Performance Units | $ | 6 |  | $ | 6 |
Stock Options | 2 |  | 4 |
Restricted Stock Units and Awards | 2 |  | 1 |
Stock Awards for Directors | 2 |  | 2 |
Employee Stock Purchase Plan | 1 |  | — |
Total Share-Based Compensation Expense | $ | 13 |  | $ | 13 |
Income Tax Benefit | $ | 28 |  | $ | 8 |
Schedule of Weighted Average Assumptions | The fair values of the performance units awarded during the quarters ended March 31, 2019 and March 31, 2018 were calculated using a Monte-Carlo simulation model with the following weighted-average assumptions:
| First Quarters
| 2019 | 2018
Weighted-average assumptions used: |  |
Annual dividend yield | 1.4 | % | 1.6 | %
Risk-free interest rate | 2.5 | % | 2.3 | %
Annualized volatility | 27.63 | % | 29.15 | %
Expected life (in years) | 2.9 |  | 2.9 |
Schedule of Fair Value Assumptions for Stock Option Awards | The fair values of all stock option awards during first quarters 2019 and 2018 were estimated at the grant date with the following weighted average assumptions:
| First Quarters
| 2019 | 2018
Weighted-average grant-date fair value | $ | 17.45 |  | $ | 14.62 |
Stock options valuation assumptions: |  |
Annual dividend yield | 1.3 | % | 1.5 | %
Risk-free interest rate | 2.6 | % | 2.6 | %
Annualized volatility | 25.8 | % | 27.0 | %
Expected life (in years) | 6.0 |  | 6.5 |
Other pricing model inputs: |  |
Weighted-average grant-date market price of CSX stock (strike price) | $ | 68.09 |  | $ | 54.07 |

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- Definition Schedule of Share-based Payment Award, Awards Other than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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