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Stock Plans and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of 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 share-based compensation expense is primarily due to modifications to the terms of awards in the first and second quarters of 2017 (see Equity Award Modifications below).
| Fiscal Years
(Dollars in Millions) | 2018 | 2017 | 2016
Share-Based Compensation Expense |  |  |
Performance Units | $ | 28 |  | $ | 49 |  | $ | 17 |
Restricted Stock Units and Awards | 6 |  | 15 |  | 11 |
Stock Options | 13 |  | 22 |  | 7 |
Stock Awards for Directors | 2 |  | 3 |  | 2 |
Employee Stock Purchase Plan | 2 |  | — |  | — |
Total Share-based Compensation Expense | $ | 51 |  | $ | 89 |  | $ | 37 |
Income Tax Benefit | $ | 26 |  | $ | 42 |  | $ | 15 |
Schedule of Assumptions and Inputs Used to Estimate Fair Value of Performance Units | The fair value of the performance units awarded during the year ended December 2018 was calculated using a Monte-Carlo simulation model with the following weighted-average assumptions:
Weighted-average assumptions used: | 2018
Annual dividend yield | 1.6 | %
Risk-free interest rate | 2.3 | %
Annualized volatility | 29.1 | %
Expected life (in years) | 2.9 |
Schedule of Performance Unit Grant and Vesting Information | Performance unit grant and vesting information is summarized as follows:
| Fiscal Years
| 2018 |  | 2017 |  | 2016
Weighted-average grant date fair value | $ | 55.57 |  |  | $ | 49.50 |  |  | $ | 24.17 |
Fair value of units vested in fiscal year ending (in millions) | $ | 14 |  |  | $ | 26 |  |  | $ | 31 |
Schedule of Performance Unit Activity Related to Outstanding Long-term Incentive Plans and Corresponding Fair Value | The performance unit activity related to the outstanding long-term incentive plans and corresponding fair value is summarized as follows:
| Performance Units Outstanding (in Thousands) |  | Weighted-Average Fair Value at Grant Date
Unvested at December 31, 2017 | 976 |  |  | $ | 33.90 |
Granted | 376 |  |  | 55.57 |
Forfeited | (43 | ) |  | 43.09 |
Vested | (587 | ) |  | 24.13 |
Unvested at December 31, 2018 | 722 |  |  | $ | 52.58 |
Schedule of Restricted Stock Grant and Vesting Information | Restricted stock grant and vesting information is summarized as follows:
| Fiscal Years
| 2018 |  | 2017 |  | 2016
Weighted-average grant date fair value | $ | 62.60 |  |  | $ | 48.35 |  |  | $ | 24.21 |
Fair value of units and awards vested during fiscal year ended (in millions) | $ | 9 |  |  | $ | 8 |  |  | $ | 14 |
Schedule of Outstanding Restricted Stock Units and Awards | The restricted stock activity related to the outstanding long-term incentive plans and other awards and corresponding fair value is summarized as follows:
| Restricted Stock Units and Awards Outstanding (in Thousands) |  | Weighted-Average Fair Value at Grant Date
Unvested at December 31, 2017 | 807 |  |  | $ | 33.37 |
Granted | 164 |  |  | 62.60 |
Forfeited | (23 | ) |  | 42.12 |
Vested | (264 | ) |  | 35.41 |
Unvested at December 31, 2018 | 684 |  |  | $ | 39.30 |
Schedule of Assumptions and Inputs Used to Estimate Fair Value of Stock Options | Assumptions and inputs used to estimate fair value of stock options are summarized as follows:
| Fiscal Years
| 2018 | 2017 | 2016
Weighted-average grant date fair value | $ | 14.65 |  | $ | 12.84 |  | $ | 4.68 |
Stock options valuation assumptions: |  |  |
Annual dividend yield | 1.5 | % | 1.5 | % | 3.0 | %
Risk-free interest rate | 2.6 | % | 2.2 | % | 1.4 | %
Annualized volatility | 27.0 | % | 27.1 | % | 27.3 | %
Expected life (in years) | 6.5 |  | 6.3 |  | 6.5 |
Other pricing model inputs: |  |  |
Weighted-average grant-date market price of CSX stock (strike price) | $ | 54.19 |  | $ | 49.63 |  | $ | 24.13 |
Schedule of Stock Option Activity | The stock option activity is summarized as follows:
| Stock Options Outstanding (in Thousands) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Life (in Years) | Aggregate Intrinsic Value (in Millions)
Outstanding at December 31, 2017 | 4,163 |  | $ | 29.52 |  |  |
Granted | 1,009 |  | 54.19 |  |  |
Forfeited | (169 | ) | 37.18 |  |  |
Exercised | (330 | ) | 24.99 |  |  |
Outstanding at December 31, 2018 | 4,673 |  | $ | 34.89 |  | 7.7 | $ | 139 |
Exercisable at December 31, 2018 | 1,268 |  | $ | 24.99 |  | 6.9 | $ | 50 |

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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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