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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Table Text Block [Abstract] |
Summary of Stock Option and RSA Activity | A summary of stock option and RSA activity as of December 31, 2014, 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, 2013 |  | 18,615 |  | $ | 44.98 |  | 9,578 |  | $ | 51.88
Granted |  | 295 |  |  | 86.64 |  | 2,639 |  |  | 86.65
Exercised/vested |  | (5,893) |  |  | 48.05 |  | (3,427) |  |  | 47.25
Forfeited |  | (242) |  |  | 51.83 |  | (916) |  |  | 60.98
Expired |  | (46) |  |  | 47.84 |  | ― |  |  | ―
Outstanding as of December 31, 2014 |  | 12,729 |  |  | 44.39 |  | 7,874 |  | $ | 64.48
Options vested and expected to vest as of December 31, 2014 |  | 12,726 |  |  | 44.39 |  | ― |  |  | ―
Options exercisable as of December 31, 2014 |  | 11,628 |  | $ | 42.64 |  | ― |  |  | ―
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 p rice of the option) of the stock options outstanding, exercisable, and vested and expected to vest as of December 31, 2014 are as follows:
|  |  | Outstanding |  | Exercisable |  | Vested and Expected to Vest
Weighted-average remaining contractual life (in years) |  |  | 3.8 |  |  | 3.5 |  |  | 3.8
Aggregate intrinsic value (millions) |  | $ | 619 |  | $ | 586 |  | $ | 619
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 grants issued in 2014, 2013 and 2012, the majority of which were gr anted in the beginning of each year:
|  | 2014 |  | 2013 |  | 2012 |
Dividend yield |  |  | 1.1 | % | 1.4 | % |  | 1.5 | %
Expected volatility(a) |  |  | 46 | % | 39 | % |  | 41 | %
Risk-free interest rate |  |  | 2.2 | % | 1.3 | % |  | 1.3 | %
Expected life of stock option (in years)(b) |  |  | 6.7 |  |  | 6.3 |  |  | 6.3 |
Weighted-average fair value per option |  | $ | 32.36 |  | $ | 21.11 |  | $ | 17.48 |
The expected volatility is based on both weighted historical and implied volatilities of the Company’s common stock price. In 2014, 2013 and 2012, 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) |  | 2014 |  | 2013 |  | 2012
Restricted stock awards(a) |  | $ | 193 |  | $ | 208 |  | $ | 197
Stock options(a) |  |  | 13 |  |  | 23 |  |  | 29
Liability-based awards |  |  | 84 |  |  | 119 |  |  | 70
Performance/market-based stock options |  |  | ― |  |  | ― |  |  | 1
Total stock-based compensation expense (b) |  | $ | 290 |  | $ | 350 |  | $ | 297
As of December 31, 2014, the total unrecognized compensation cost related to unvested RSAs and options of $211 million and $6 million, respectively, will be recognized ratably over the weighted-average remaining vesting period of 1.3 years and 2.1 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, 2014, 2013 and 2012 was $104 million, $127 million and $107 million, respectively.

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- Definition Represents weighted-average assumptions used for grants issued during the period. + References No definition available. + Details
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- Definition Represents the components of the Company's stock-based compensation expense (net of cancellations) during the period. + References No definition available. + Details
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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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