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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
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,
| 2015 |  | 2014 |  | 2013
Stock-based compensation expense: |  |  |  |  |
Restricted stock | $ | 47 |  |  | $ | 43 |  |  | $ | 49 |
Performance awards | 11 |  |  | 15 |  |  | 11 |
Stock options | 1 |  |  | 2 |  |  | 4 |
Total stock-based compensation expense | $ | 59 |  |  | $ | 60 |  |  | $ | 64 |
Tax benefit recognized on stock-based compensation expense | $ | 21 |  |  | $ | 21 |  |  | $ | 22 |
Tax benefit realized for tax deductions resulting from exercises and vestings | 66 |  |  | 64 |  |  | 66 |
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow | 44 |  |  | 47 |  |  | 47 |
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,
| 2015 |  | 2014 |  | 2013
Weighted-average grant-date fair value per share of restricted stock granted | $ | 70.07 |  |  | $ | 49.40 |  |  | $ | 39.55 |
Fair value of restricted stock vested | 69 |  |  | 60 |  |  | 74 |
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 table below.
| Number of Shares |  | Weighted- Average Grant-Date Fair Value Per Share
Nonvested shares as of January 1, 2015 | 1,758,150 |  |  | $ | 41.96 |
Granted | 829,213 |  |  | 70.07 |
Vested | (1,016,862 | ) |  | 41.72 |
Forfeited | (19,061 | ) |  | 41.42 |
Nonvested shares as of December 31, 2015 | 1,551,440 |  |  | 57.15 |
Summary of performance awards | A summary of the status of our performance awards is presented below.
| Nonvested Awards |  | Weighted- Average Grant-Date Fair Value Per Share
Awards outstanding as of January 1, 2015 | 614,390 |  |  | $ | 42.06 |
Granted | 183,299 |  |  | 88.97 |
Vested | (388,561 | ) |  | 38.77 |
Forfeited | (703 | ) |  | 48.57 |
Awards outstanding as of December 31, 2015 | 408,425 |  |  | 66.23 |
Performance awards converted during the year ended December 31, 2015 were as follows:
| Vested Awards Converted |  | Actual Conversion Rate |  | Number of Shares Issued
2011 awards | 213,299 |  |  | 166.7% |  | 355,576 |
2012 awards | 96,845 |  |  | 200.0% |  | 193,690 |
2013 awards | 78,417 |  |  | 200.0% |  | 156,834 |
Total | 388,561 |  |  |  |  | 706,100 |

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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=6415400&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=6415400&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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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