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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Table Text Block [Abstract] |
Summary of Stock Option and RSA Activity | A summary of stock option and RSA acti vity as of December 31, 2016 and changes during the year is presented below:
|  |  | Stock Options |  | RSAs
(Shares in thousands) |  | Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Price
Outstanding as of December 31, 2015 |  | 10,820 |  | $ | 44.60 |  | 7,433 |  | $ | 74.67
Granted |  | 2,920 |  |  | 63.89 |  | 4,062 |  |  | 55.55
Exercised/vested |  | (3,396) |  |  | 51.40 |  | (3,128) |  |  | 63.93
Forfeited |  | (67) |  |  | 66.02 |  | (867) |  |  | 70.99
Expired |  | (5) |  |  | 51.87 |  | ― |  |  | ―
Outstanding as of December 31, 2016 |  | 10,272 |  |  | 47.68 |  | 7,500 |  | $ | 69.22
Options vested and expected to vest as of December 31, 2016 |  | 10,031 |  |  | 47.26 |  | ― |  |  | ―
Options exercisable as of December 31, 2016 |  | 6,963 |  | $ | 38.55 |  | ― |  |  | ―
Weighted-average remaining contractual life and aggregate intrinsic value of the Company's stock options outstanding, exerciseable, and vested and expected to vest | The weighted-average remaining contractual life and the aggregate intrinsic value (the amount by which the fair value of the Company’s stock exceeds the exercise price of the option) of the stock options outstanding, exercisable, vested, and expected to vest as of December 31, 2016, are as follows:
|  |  | Outstanding |  | Exercisable |  | Vested and Expected to Vest
Weighted-average remaining contractual life (in years) |  |  | 4.8 |  |  | 2.8 |  |  | 4.7
Aggregate intrinsic value (millions) |  | $ | 277 |  | $ | 248 |  | $ | 275
Weighted Average Assumptions Used | The fair va lue of each option is estimated on the date of grant using a Black-Scholes-Merton option-pricing model. The following weighted-average assumptions were used for options granted in 2016, 2015 and 2014:
|  | 2016 |  | 2015 |  | 2014 |
Dividend yield |  |  | 1.9 | % | 1.1 | % |  | 1.1 | %
Expected volatility(a) |  |  | 25 | % | 37 | % |  | 38 | %
Risk-free interest rate |  |  | 1.5 | % | 1.7 | % |  | 2.2 | %
Expected life of stock option (in years)(b) |  |  | 6.3 |  |  | 6.7 |  |  | 6.7 |
Weighted-average fair value per option |  | $ | 13.67 |  | $ | 29.20 |  | $ | 32.36 |
The expected volatility is based on both weighted historical and implied volatilities of the Company’s common stock price. T he expected life of stock options was determined using both historical data and expectations of option exercise behavior.
Summary of Stock Plan Expenses | The components of the Company’s total stock-based compensation expense (net of forfeitures) for the years ended December 31 are as follows:
(Millions) |  | 2016 |  | 2015 |  | 2014
Restricted stock awards(a) |  | $ | 178 |  | $ | 190 |  | $ | 193
Stock options(a) |  |  | 14 |  |  | 12 |  |  | 13
Liability-based awards |  |  | 60 |  |  | 32 |  |  | 84
Total stock-based compensation expense (b) |  | $ | 252 |  | $ | 234 |  | $ | 290
As of December 31, 2016, the total unrecognized compensation cost related to unvested RSAs and options of $189 million and $24 million, respectively, will be recognized ratably over the weighted-average remaining vesting period of 2.0 years and 2.1 years, respectively. The total income tax benefit recognized in the Consolidated Statements of Income for stock-based compensation arrangements for the years ended December 31, 2016, 2015 and 2014 was $89 mi llion, $83 million and $104 million, respectively.

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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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