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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation and Related Income Tax Benefit | Total pre-tax expense associated with share-based compensation and its related income tax benefit is shown in the table below. The year over year decrease in third quarter share-based compensation expense is primarily due to the prior year expense related to 9 million stock options granted in February 2017 to former President and CEO E. Hunter Harrison, which were forfeited upon his death in December 2017. Additionally, the decrease in nine months expense was also due to modifications to the terms of awards in the first and second quarters of 2017 (see Equity Award Modifications below).
| Third Quarters |  | Nine Months
(Dollars in millions) | 2018 | 2017 |  | 2018 | 2017
Share-Based Compensation Expense: |  |  |  |  |
Performance Units | $ | 8 |  | $ | 3 |  |  | $ | 22 |  | $ | 41 |
Stock Options | 4 |  | 14 |  |  | 10 |  | 47 |
Restricted Stock Units and Awards | 1 |  | 2 |  |  | 4 |  | 11 |
Stock Awards for Directors | — |  | — |  |  | 2 |  | 2 |
Total Share-Based Compensation Expense | $ | 13 |  | $ | 19 |  |  | $ | 38 |  | $ | 101 |
Income Tax Benefit | $ | 6 |  | $ | 12 |  |  | $ | 23 |  | $ | 41 |
Schedule of Weighted Average Assumptions | The fair value of the performance units awarded during the quarter and nine months ended September 30, 2018 was calculated using a Monte-Carlo simulation model with the following weighted-average assumptions:
| Third Quarter |  | Nine Months
| 2018 |  | 2018
Weighted-average assumptions used: |  |  |
Annual dividend yield | 1.2 | % |  | 1.6 | %
Risk-free interest rate | 2.7 | % |  | 2.3 | %
Annualized volatility | 27.9 | % |  | 29.1 | %
Expected life (in years) | 2.3 |  |  | 2.9 |
Summary of Fair Value Assumptions for Stock Option Awards | The fair values of all stock option awards during the quarter and nine months ended September 30, 2018 and September 30, 2017 were estimated at the grant date with the following weighted average assumptions:
| Third Quarters |  | Nine Months
| 2018 | 2017 |  | 2018 | 2017
Weighted-average grant date fair value | $ | 20.52 |  | $ | — |  |  | $ | 14.65 |  | $ | 12.83 |
Stock options valuation assumptions: |  |  |  |  |
Annual dividend yield | 1.2 | % | — | % |  | 1.5 | % | 1.5 | %
Risk-free interest rate | 2.8 | % | — | % |  | 2.6 | % | 2.2 | %
Annualized volatility | 25.5 | % | — | % |  | 27.0 | % | 27.1 | %
Expected life (in years) | 6.5 |  | — |  |  | 6.5 |  | 6.3 |
Other pricing model inputs: |  |  |  |  |
Weighted-average grant-date market price of CSX stock (strike price) | $ | 74.84 |  | $ | — |  |  | $ | 54.19 |  | $ | 49.60 |

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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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