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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] |
Summary of Share-Based Payment Award Stock Options Valuation Assumptions | The weighted average assumptions used in the Monte Carlo simulation model to calculate the fair value of the Company’s stock unit awards are outlined in the table below.
|  |  | 2016 |  | 2015
Expected volatility of stock price |  |  | 46% |  | 37%
Risk-free interest rate |  |  | 0.98% |  | 0.74%
Valuation period |  |  | 3 years |  | 3 years
Dividend yield |  |  | 0% |  | 0%
Annual Activity of RSUs | Annual activity related to stock units consisted of (in thousands of shares):
|  |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Time-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2017 | 878 |  |  | $ | 34.83 |  |  |  |  |
|  | Granted (a) | 914 |  |  | 35.32 |  |  |  |  |
|  | Vested (b) | (470 | ) |  | 37.12 |  |  |  |  |
|  | Forfeited | (162 | ) |  | 33.07 |  |  |  |  |
| Outstanding and expected to vest at December 31, 2017 (c) | 1,160 |  |  | $ | 34.54 |  |  | 0.9 |  | $ | 51 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2017 | 923 |  |  | $ | 34.11 |  |  |  |  |
|  | Granted (a) | 572 |  |  | 35.21 |  |  |  |  |
|  | Vested (b) | (146 | ) |  | 36.55 |  |  |  |  |
|  | Forfeited | (355 | ) |  | 37.82 |  |  |  |  |
| Outstanding at December 31, 2017 | 994 |  |  | $ | 33.06 |  |  | 1.4 |  | $ | 44 |
| Outstanding and expected to vest at December 31, 2017 (c) | 97 |  |  | $ | 36.64 |  |  | 2.2 |  | $ | 4 |
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(a) | Reflects the maximum number of stock units assuming achievement of all performance-, market- and time-vesting criteria and does not include those for non-employee directors, which are discussed separately below. The weighted-average fair value of time-based RSUs and performance-based and market-based RSUs granted in 2016 was $25.92 and $23.33, respectively, and the weighted-average fair value of time-based RSUs and performance-based and market-based RSUs granted in 2015 was $54.70 and $55.51, respectively.
(b) | The total fair value of RSUs vested during 2017, 2016 and 2015 was $23 million, $31 million and $25 million, respectively. The total grant date fair value of cash units vested during the year 2016 was $2 million.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $31 million and will be recognized over a weighted average vesting period of 1.0 year.
Summary of Share Based Compensation Shares Authorized Under Stock Option Plans by Exercise Price Range | The annual stock option activity consisted of (in thousands of shares):
|  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2017 | 810 |  |  | $ | 2.91 |  |  | 2.3 |  | $ | 27 |
| Granted (a) | — |  |  | — |  |  |  |  | — |
| Exercised (b) | (537 | ) |  | 0.79 |  |  |  |  | 21 |
| Forfeited/expired | — |  |  | — |  |  |  |  |  |
Outstanding and exercisable at December 31, 2017 | 273 |  |  | $ | 7.08 |  |  | 1.7 |  | $ | 10 |
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(a) | No stock options were granted during 2016 or 2015.
(b) | Stock options exercised during 2016 and 2015 had intrinsic values of $1 million in each period, and the cash received from the exercise of options was insignificant in 2017, 2016 and 2015.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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://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=96867065&loc=d3e5070-113901 + Details
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