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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Table Text Block [Abstract] |
Summary of Stock Option and RSA Activity | A summary of stock option and RSA activity as of December 31, 2015, 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, 2014(a) |  | 13,416 |  | $ | 44.88 |  | 7,874 |  | $ | 64.48
Granted |  | 301 |  |  | 83.30 |  | 3,069 |  |  | 81.99
Exercised/vested |  | (2,921) |  |  | 49.96 |  | (3,003) |  |  | 55.17
Forfeited |  | (10) |  |  | 49.22 |  | (507) |  |  | 75.99
Expired |  | 34 |  |  | 50.04 |  | ― |  |  | ―
Outstanding as of December 31, 2015 |  | 10,820 |  |  | 44.60 |  | 7,433 |  | $ | 74.67
Options vested and expected to vest as of December 31, 2015 |  | 10,820 |  |  | 44.60 |  | ― |  |  | ―
Options exercisable as of December 31, 2015 |  | 9,809 |  | $ | 41.78 |  | ― |  |  | ―
Outstanding as of December 31, 2014, includes CEO market-based stock options of 687,000 that were previously disclosed separately.
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 remainin g 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 option s outstanding, exercisable, vested, and expected to vest as of December 31, 2015, are as follows:
|  |  | Outstanding |  | Exercisable |  | Vested and Expected to Vest
Weighted-average remaining contractual life (in years) |  |  | 3.4 |  |  | 2.9 |  |  | 3.4
Aggregate intrinsic value (millions) |  | $ | 279 |  | $ | 273 |  | $ | 279
Weighted Average Assumptions Used | The fair value 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 2015, 2014 and 2013, the majority of which were options granted in the beginning of each year:
|  | 2015 |  | 2014 |  | 2013 |
Dividend yield |  |  | 1.1 | % | 1.1 | % |  | 1.4 | %
Expected volatility(a) |  |  | 37 | % | 38 | % |  | 39 | %
Risk-free interest rate |  |  | 1.7 | % | 2.2 | % |  | 1.3 | %
Expected life of stock option (in years)(b) |  |  | 6.7 |  |  | 6.7 |  |  | 6.3 |
Weighted-average fair value per option |  | $ | 29.20 |  | $ | 32.36 |  | $ | 21.11 |
The expected volatility is based on both weighted historical and implied volatilities of the Company’s common stock price. In 2015, 2014 and 2013, the expected life of stock options was determined using both historical data and expectations of option exercise behavior.
Summary of Stock Plan Expenses | The comp onents of the Company’s total stock-based compensation expense (net of forfeitures) for the years ended December 31, are as follows:
(Millions) |  | 2015 |  | 2014 |  | 2013
Restricted stock awards(a) |  | $ | 190 |  | $ | 193 |  | $ | 208
Stock options(a) |  |  | 12 |  |  | 13 |  |  | 23
Liability-based awards |  |  | 32 |  |  | 84 |  |  | 119
Total stock-based compensation expense (b) |  | $ | 234 |  | $ | 290 |  | $ | 350
As of December 31, 2015, the total unrecognized compensation cost related to unvested RSAs and options of $214 million and $3 million, respectively, will be recognized ratably over the weighted-average remaining vesting period of 2.1 years and 1.2 years, respectively. The total incom e tax benefit recognized in the Consolidated Statements of Income for stock-ba sed compensation arrangements for the years ended December 31, 2015, 2014 and 2013 was $83 million, $104 million and $127 million, respectively.

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- Definition Represents table summarizing 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, and vested and expected to vest. + References No definition available. + 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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