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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Stock Plans Tables [Abstract] |
Summary of Stock Option and RSA Activity | A summary of stock option and RSA activity as of December 31, 2011, 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, 2010 |  | 56,963 |  | $ | 39.54 |  | 15,074 |  | $ | 28.97
Granted |  | 1,197 |  | $ | 44.78 |  | 4,759 |  | $ | 45.11
Exercised/vested |  | (14,813) |  | $ | 33.97 |  | (4,986) |  | $ | 30.74
Forfeited |  | (349) |  | $ | 29.24 |  | (851) |  | $ | 31.44
Expired |  | (541) |  | $ | 44.90 |  | ― |  | $ | ―
Outstanding as of |  |  |  |  |  |  |  |  |  |
| December 31, 2011 |  | 42,457 |  | $ | 41.63 |  | 13,996 |  | $ | 33.69
Options vested and |  |  |  |  |  |  |  |  |  |
| expected to vest as of |  |  |  |  |  |  |  |  |  |
|  | December 31, 2011 |  | 42,359 |  | $ | 41.64 |  | ― |  |  | ―
Options exercisable as of |  |  |  |  |  |  |  |  |  |
| December 31, 2011 |  | 35,275 |  | $ | 43.10 |  | ― |  |  | ―
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, and vested and expected to vest as of December 31, 2011 were as follows:
|  |  | Outstanding |  | Exercisable |  | Vested and Expected to Vest
Weighted-average remaining |  |  |  |  |  |  |  |  |
| contractual life (in years) |  |  | 4.7 |  |  | 4.2 |  |  | 4.7
Aggregate intrinsic value (millions) |  | $ | 338 |  | $ | 239 |  | $ | 337
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 are used for grants issued in 2011, 2010 and 2009, the majority of which were granted in the beginning of each year:
|  | 2011 |  | 2010 |  | 2009 |
Dividend yield |  |  | 1.6 | % | 1.8 | % |  | 4.1 | %
Expected volatility(a) |  |  | 40 | % | 41 | % |  | 36 | %
Risk-free interest rate |  |  | 2.3 | % | 2.8 | % |  | 2.1 | %
Expected life of stock option (in years)(b) |  |  | 6.2 |  |  | 6.2 |  |  | 4.8 |
Weighted-average fair value per option |  | $ | 16.21 |  | $ | 14.11 |  | $ | 4.54 |
The expected volatility is based on weighted historical and implied volatilit i es of the Company's common stock price. In 2011 and 2010, the expected life of stock options was determined using historical data and expectations of option exercise behavior. In 2009, the expected life of stock options was determined using historical data.
Summary of Stock Plan Expenses | summary of stock plan expense The components of the Company's total stock-based compensation expense (net of cancellations) for the years ended December 31 are as follows:
(Millions) |  | 2011 |  | 2010 |  | 2009
Restricted stock awards(a) |  | $ | 176 |  | $ | 163 |  | $ | 135
Stock options(a) |  |  | 40 |  |  | 58 |  |  | 55
Liability-based awards |  |  | 83 |  |  | 64 |  |  | 38
Performance/market-based |  |  |  |  |  |  |  |  |
| stock options |  |  | 2 |  |  | 2 |  |  | 2
Total stock-based |  |  |  |  |  |  |  |  |
| compensation expense(b) |  | $ | 301 |  | $ | 287 |  | $ | 230
As of December 31, 2011, the total unrecognized compensation cost related to unvested RSAs and options was $259 million and $39 million, respectively. The unrecognized cost for RSAs and options will be recognized ratably over the remaining vesting period. The weighted-average remaining vesting period for both RSAs and options is 1.6 years. 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, 2011, 2010 and 2009 was $105 million, $100 million and $81 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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