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Stock Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Award Activity | Award activity — (shares in millions)
|  | Options |  | SARs |  | RSUs |  | PSUs
|  |  |  | Weighted- Average |  |  |  | Weighted- Average |  |  |  | Weighted- Average Grant-Date |  |  |  | Weighted- Average Grant-Date
Outstanding at |  | Shares |  | Exercise Price |  | Shares |  | Exercise Price |  | Shares |  | Fair Value |  | Shares |  | Fair Value
December 31, 2013 |  | 2.6 |  |  | $ | 13.85 |  |  | 0.5 |  |  | $ | 15.46 |  |  | 1.3 |  |  | $ | 16.29 |  |  | — |  |  | $ | — |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |  |  | 21.20 |  |  | 0.3 |  |  | 24.36 |
Exercised or vested |  | (0.6 | ) |  | 11.48 |  |  | (0.1 | ) |  | 16.49 |  |  | (0.4 | ) |  | 16.99 |  |  |  |  |
Forfeited or expired |  | (0.1 | ) |  | 15.89 |  |  |  |  |  |  |  |  | (0.1 | ) |  | 14.91 |  |  |  |  |
December 31, 2014 |  | 1.9 |  |  | $ | 14.46 |  |  | 0.4 |  |  | $ | 15.18 |  |  | 1.5 |  |  | $ | 18.18 |  |  | 0.3 |  |  | $ | 24.36 |
| 2014 |  | 2013 |  | 2012
Weighted-average per share grant-date fair value |  |  |  |  |  |  |  |
Stock options | N/A |  |  | $ | 7.46 |  |  | $ | 7.88 |
SARs | N/A |  |  | 7.45 |  |  | 7.84 |
Intrinsic value of awards exercised or vested |  |  |  |  |  |  |
Stock options / SARs | $ | 7 |  |  | $ | 14 |  |  | $ | 18 |
RSUs / PSUs | 8 |  |  | 5 |  |  | 11 |
Key Assumptions as Part of Black-Scholes Option Pricing Model | We estimated fair values for options and SARs at the date of grant using the following key assumptions as part of the Black-Scholes option pricing model. The expected term was estimated using the simplified method because the limited period of time our common stock had been publicly traded provided insufficient historical exercise data. The risk-free rate was based on U.S. Treasury security yields at the time of grant. The dividend yield was calculated by dividing the expected annual dividend by the average stock price of our common stock over the prior year. The expected volatility was estimated using a combination of the historical volatility of similar entities and the implied volatility of our exchange-traded options.
| Options |  | SARs
| 2013 |  | 2012 |  | 2013 |  | 2012
Expected term (in years) | 6.00 |  |  | 6.00 |  |  | 6.00 |  |  | 6.00 |
Risk-free interest rate | 1.07 | % |  | 1.24 | % |  | 1.07 | % |  | 1.24 | %
Dividend yield | 1.41 | % |  | 1.33 | % |  | 1.41 | % |  | 1.33 | %
Expected volatility | 55.80 | % |  | 59.90 | % |  | 55.80 | % |  | 59.90 | %
Outstanding Awards Expected to Vest and Exercisable | Outstanding awards expected to vest and exercisable or convertible at December 31, 2014 — (shares in millions)
| Equity Awards Outstanding Expected to Vest |  | Equity Awards Outstanding That are Exercisable or Convertible
|  |  |  |  | Weighted-Average |  |  |  |  |  | Weighted-Average
| Shares |  | Aggregate Intrinsic Value |  | Exercise Price |  | Remaining Contractual Life in Years |  | Shares |  | Aggregate Intrinsic Value |  | Exercise Price |  | Remaining Contractual Life in Years
Options / SARs | 2.3 |  |  | $ | 16 |  |  | $ | 14.56 |  |  | 6.9 |  | 1.4 |  |  | $ | 12 |  |  | $ | 13.64 |  |  | 6.3
RSUs / PSUs | 1.8 |  |  | 39 |  |  | — |  |  | 1.3 |  | 0.1 |  |  | 1 |  |  | — |  |  | 0.2

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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