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Share-based Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Weighted Average Black-Scholes Assumptions | Based on the results of the model, the weighted-average grant date fair value of stock options granted for 2014, 2013, and 2012 were $42.09, $33.92 and $19.54, respectively, using the following assumptions:
Weighted Average Black-Scholes Assumptions |  | 2014 |  | 2013 |  | 2012
Risk-free interest rate |  | 1.5 | % |  | 0.9 | % |  | 0.9 | %
Expected volatility |  | 38.2 | % |  | 40.3 | % |  | 40.3 | %
Expected dividend yield |  | 1.8 | % |  | 1.8 | % |  | 2.9 | %
Expected option life, in years |  | 5 |  |  | 5 |  |  | 5 |
Summary of Stock Option Activity | The following table summarizes stock option activity during 2014:
In thousands, except per share data |  | Number of Options |  | Weighted- Average Exercise Price
Outstanding at January 1 |  | 2,255 |  |  | $ | 77.87 |
Granted |  | 393 |  |  | 138.60 |
Exercised |  | (487 | ) |  | 78.58 |
Canceled or expired |  | (46 | ) |  | 94.35 |
Outstanding at December 31 |  | 2,115 |  |  | $ | 88.62 |
Exercisable at December 31 |  | 1,236 |  |  | $ | 70.87 |
Summary of Additional Information Related to Stock Options Outstanding | The table below summarizes additional information related to stock options outstanding at December 31, 2014:
Options in thousands / dollars in millions, except share data |  | Outstanding Net of Expected Forfeitures |  | Options Exercisable
Number of options |  | 2,043 |  |  | 1,236 |
Weighted-average exercise price per share |  | $ | 87.11 |  |  | $ | 70.87 |
Aggregate intrinsic value |  | $ | 218 |  |  | $ | 152 |
Weighted-average remaining contractual term, in years |  | 6 |  |  | 5 |
Summary of Stock Unity Activity | The following table summarizes stock unit activity during 2014:
Stock units in thousands, except per-share data |  | Number of Stock Units |  | Weighted- Average Grant Date Fair Value
Non-vested, at January 1 |  | 1,202 |  |  | $ | 82.40 |
Granted |  | 245 |  |  | 133.31 |
Canceled |  | (37 | ) |  | 82.62 |
Vested and transferred to unrestricted |  | (306 | ) |  | 80.88 |
Non-vested, at December 31 |  | 1,104 |  |  | $ | 90.34 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) currently exercisable (or convertible). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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