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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Stock Options | The following summarizes options activity:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Number |  |  | Average |  |  | Number |  |  | Average |  |  | Number |  |  | Average |
|  | of |  |  | Exercise |  |  | of |  |  | Exercise |  |  | of |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Shares under option at beginning of year |  |  | 10,481,750 |  |  | $ | 47.20 |  |  |  | 11,039,544 |  |  | $ | 38.01 |  |  |  | 10,255,982 |  |  | $ | 34.19 |
Granted |  |  | 2,239,088 |  |  |  | 84.58 |  |  |  | 2,277,946 |  |  |  | 79.68 |  |  |  | 3,485,283 |  |  |  | 44.03 |
Cancelled |  |  | (228,137 | ) |  |  | 60.28 |  |  |  | (241,174 | ) |  |  | 40.20 |  |  |  | (232,488 | ) |  |  | 40.53 |
Exercised |  |  | (3,019,219 | ) |  |  | 82.26 |  |  |  | (2,594,566 | ) |  |  | 36.84 |  |  |  | (2,469,233 | ) |  |  | 30.35 |
Shares under option at end of year |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 10,481,750 |  |  | $ | 47.20 |  |  |  | 11,039,544 |  |  | $ | 38.01 |
Exercisable at end of year |  |  | 4,823,331 |  |  | $ | 43.99 |  |  |  | 5,073,965 |  |  | $ | 38.47 |  |  |  | 5,067,186 |  |  | $ | 36.31 |
Summary of Stock Option Outstanding Information | The following summarizes information about stock options outstanding at December 31, 2012:
|  | Weighted-Avg |  |  | Options Outstanding |  |  | Options Exercisable |
|  | Remaining |  |  |  |  |  | Weighted-Avg |  |  |  |  |  | Weighted-Avg |
Range of Exercise Price |  | Contractual Life |  |  | Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
$9.14—$40.00 |  |  | 4.16 |  |  |  | 2,436,289 |  |  | $ | 27.79 |  |  |  | 2,436,289 |  |  | $ | 27.79 |
$40.01—$65.00 |  |  | 6.47 |  |  |  | 2,738,151 |  |  |  | 49.42 |  |  |  | 1,690,555 |  |  |  | 52.75 |
$65.01—$84.58 |  |  | 8.63 |  |  |  | 4,299,042 |  |  |  | 82.12 |  |  |  | 696,487 |  |  |  | 79.40 |
Total |  |  | 6.86 |  |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 4,823,331 |  |  | $ | 43.99 |
Assumption Used in Determination of Fair Value of Share Based Payment Awards | The use of the Black Scholes model requires the use of extensive actual employee exercise activity data and the use of a number of complex assumptions including expected volatility, risk-free interest rate, expected dividends and expected term.
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Valuation Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 51.7 | % |  |  | 53.2 | % |  |  | 55.0 | %
Risk-free interest rate |  |  | 0.9 | % |  |  | 2.1 | % |  |  | 2.3 | %
Expected dividends |  | $ | 0.57 |  |  | $ | 0.44 |  |  | $ | 0.40 |
Expected term (in years) |  |  | 3.2 |  |  |  | 3.1 |  |  |  | 3.2 |
Summary of Information and Changes in Stock Options with Regard to Stock Option Plans | The following summary presents information regarding outstanding options at December 31, 2012 and changes during 2012 with regard to options under all stock option plans:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2011 |  |  | 10,481,750 |  |  | $ | 47.20 |  |  |  | 7.03 |  |  | $ | 217,950,989 |
Granted |  |  | 2,239,088 |  |  | $ | 84.58 |  |  |  |  |  |  |  |  |
Exercised |  |  | (228,137 | ) |  | $ | 60.28 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (3,019,219 | ) |  | $ | 82.26 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 6.86 |  |  | $ | 150,667,018 |
Vested or expected to vest |  |  | 9,321,906 |  |  | $ | 58.69 |  |  |  | 6.86 |  |  | $ | 148,256,346 |
Exercisable at December 31, 2012 |  |  | 4,823,331 |  |  | $ | 43.99 |  |  |  | 5.38 |  |  | $ | 125,192,433 |
Summary of Information Regarding Outstanding Restricted Shares | The following summary presents information regarding outstanding restricted shares:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Number of Units |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of Units |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of Units |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of year |  |  | 1,606,047 |  |  | $ | 44.21 |  |  |  | 1,765,837 |  |  | $ | 42.15 |  |  |  | 2,181,244 |  |  | $ | 40.51 |
Granted |  |  | 482,428 |  |  |  | 83.79 |  |  |  | 374,425 |  |  |  | 79.53 |  |  |  | 558,531 |  |  |  | 43.99 |
Vested |  |  | (406,844 | ) |  |  | 83.34 |  |  |  | (496,642 | ) |  |  | 64.22 |  |  |  | (921,454 | ) |  |  | 43.28 |
Cancelled |  |  | (344,965 | ) |  |  | 30.39 |  |  |  | (37,573 | ) |  |  | 44.02 |  |  |  | (52,484 | ) |  |  | 35.11 |
Nonvested at end of year |  |  | 1,336,666 |  |  | $ | 67.56 |  |  |  | 1,606,047 |  |  | $ | 44.21 |  |  |  | 1,765,837 |  |  | $ | 42.15 |

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