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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock-based compensation expense and tax benefits | The following table reflects activity related to our stock-based compensation arrangements (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Stock-based compensation expense: |  |  |  |  |
Restricted stock | $ | 58 |  |  | $ | 52 |  |  | $ | 47 |
Performance awards | 19 |  |  | 15 |  |  | 11 |
Stock options | — |  |  | 1 |  |  | 1 |
Total stock-based compensation expense | $ | 77 |  |  | $ | 68 |  |  | $ | 59 |
Tax benefit recognized on stock-based compensation expense | $ | 27 |  |  | $ | 24 |  |  | $ | 21 |
Tax benefit realized for tax deductions resulting from exercises and vestings | 44 |  |  | 33 |  |  | 66 |
Effect of tax deductions in excess of recognized stock-based compensation expense (a) | 24 |  |  | 22 |  |  | 44 |
_______________________________
(a) | Effective January 1, 2016, the effect of tax deductions in excess of recognized stock-based compensation expense is reported as an operating cash flow. These amounts were previously reported as financing cash flows.
Summary of restricted stock awards | The following table reflects activity related to our restricted stock (in millions, except per share data):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted-average grant-date fair value per share of restricted stock granted | $ | 79.32 |  |  | $ | 59.00 |  |  | $ | 70.07 |
Fair value of restricted stock vested | 71 |  |  | 46 |  |  | 69 |
The fair value of each restricted stock per share is equal to the market price of our common stock. A summary of the status of our restricted stock awards is presented in the following table.
| Number of Shares |  | Weighted- Average Grant-Date Fair Value Per Share
Nonvested shares as of January 1, 2017 | 1,566,950 |  |  | $ | 60.68 |
Granted | 739,393 |  |  | 79.32 |
Vested | (897,246 | ) |  | 61.76 |
Forfeited | (8,057 | ) |  | 61.22 |
Nonvested shares as of December 31, 2017 | 1,401,040 |  |  | 69.82 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 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=96867065&loc=d3e5047-113901 Reference 3: 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 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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