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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Equity [Abstract] |
Summary of Stock Options | The following summarizes options activity:
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | 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 |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 10,481,750 |  |  | $ | 47.20 |  |  |  | 11,039,544 |  |  | $ | 38.01 |
Granted |  |  | 2,832,587 |  |  |  | 69.37 |  |  |  | 2,239,088 |  |  |  | 84.58 |  |  |  | 2,277,946 |  |  |  | 79.68 |
Cancelled |  |  | (303,417 | ) |  |  | 72.43 |  |  |  | (228,137 | ) |  |  | 60.28 |  |  |  | (241,174 | ) |  |  | 40.20 |
Exercised |  |  | (1,366,459 | ) |  |  | 77.44 |  |  |  | (3,019,219 | ) |  |  | 82.26 |  |  |  | (2,594,566 | ) |  |  | 36.84 |
Shares under option at end of year |  |  | 10,636,193 |  |  | $ | 63.29 |  |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 10,481,750 |  |  | $ | 47.20 |
Exercisable at end of year |  |  | 5,831,091 |  |  | $ | 53.46 |  |  |  | 4,823,331 |  |  | $ | 43.99 |  |  |  | 5,073,965 |  |  | $ | 38.47 |
Summary of Stock Option Outstanding Information | The following summarizes information about stock options outstanding at December 31, 2013:
|  | Weighted-Avg |  |  | Options Outstanding |  |  | Options Exercisable |
|  | Remaining |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
Range of Exercise Price |  | Contractual |  |  | Shares |  |  | Exercise |  |  | Shares |  |  | Exercise |
$9.14—$45.00 |  |  | 4.36 |  |  |  | 3,201,686 |  |  | $ | 34.43 |  |  |  | 3,201,686 |  |  | $ | 34.43 |
$45.01—$70.00 |  |  | 8.17 |  |  |  | 3,361,420 |  |  |  | 67.84 |  |  |  | 622,464 |  |  |  | 61.32 |
$70.01—$84.58 |  |  | 7.63 |  |  |  | 4,073,087 |  |  |  | 82.21 |  |  |  | 2,006,941 |  |  |  | 81.39 |
Total |  |  | 6.82 |  |  |  | 10,636,193 |  |  | $ | 63.29 |  |  |  | 5,831,091 |  |  | $ | 53.46 |
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, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Valuation Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 50.1 | % |  |  | 51.7 | % |  |  | 53.2 | %
Risk-free interest rate |  |  | 0.9 | % |  |  | 0.9 | % |  |  | 2.1 | %
Expected dividends |  | $ | 0.75 |  |  | $ | 0.57 |  |  | $ | 0.44 |
Expected term (in years) |  |  | 3.4 |  |  |  | 3.2 |  |  |  | 3.1 |
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, 2013 and changes during 2013 with regard to options under all stock option plans:
|  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Weighted- Average |  |  | Remaining Contractual |  |  | Average |
|  | Shares |  |  | Exercise Price |  |  | Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2012 |  |  | 9,473,482 |  |  | $ | 58.69 |  |  |  | 6.86 |  |  | $ | 150,667,018 |
Granted |  |  | 2,832,587 |  |  | $ | 69.37 |  |  |  |  |  |  |  |  |
Exercised |  |  | (303,417 | ) |  | $ | 72.43 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (1,366,459 | ) |  | $ | 77.44 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 10,636,193 |  |  | $ | 63.29 |  |  |  | 6.82 |  |  | $ | 183,849,267 |
Vested or expected to vest |  |  | 10,466,014 |  |  | $ | 63.29 |  |  |  | 6.82 |  |  | $ | 180,907,679 |
Exercisable at December 31, 2013 |  |  | 5,831,091 |  |  | $ | 53.46 |  |  |  | 5.37 |  |  | $ | 155,892,094 |
Summary of Information Regarding Outstanding Restricted Shares | The following summary presents information regarding outstanding restricted shares:
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |
|  | Number |  |  | Average |  |  | Number |  |  | Average |  |  | Number |  |  | Average |
|  | of |  |  | Grant Date |  |  | of |  |  | Grant Date |  |  | of |  |  | Grant Date |
|  | Units |  |  | Fair Value |  |  | Units |  |  | Fair Value |  |  | Units |  |  | Fair Value |
Nonvested at beginning of year |  |  | 1,336,666 |  |  | $ | 67.56 |  |  |  | 1,606,047 |  |  | $ | 44.21 |  |  |  | 1,765,837 |  |  | $ | 42.15 |
Granted |  |  | 758,176 |  |  |  | 69.07 |  |  |  | 482,428 |  |  |  | 83.79 |  |  |  | 374,425 |  |  |  | 79.53 |
Vested |  |  | (340,218 | ) |  |  | 69.29 |  |  |  | (406,844 | ) |  |  | 83.34 |  |  |  | (496,642 | ) |  |  | 64.22 |
Cancelled |  |  | (239,534 | ) |  |  | 40.97 |  |  |  | (344,965 | ) |  |  | 30.39 |  |  |  | (37,573 | ) |  |  | 44.02 |
Nonvested at end of year |  |  | 1,515,090 |  |  | $ | 73.73 |  |  |  | 1,336,666 |  |  | $ | 67.56 |  |  |  | 1,606,047 |  |  | $ | 44.21 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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