Share-Based Incentive Plans (Stock Option Activity) (Details) shares in Thousands	12 Months Ended
Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options outstanding at January 1 (in shares) \| shares	2,265
Number of options granted (in shares) \| shares	481
Number of options exercised (in shares) \| shares	(367)
Number of options canceled or expired (in shares) \| shares	(88)
Number of options outstanding at December 31 (in shares) \| shares	2,291
Number of shares exercisable at December 31 (in shares) \| shares	1,455
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price outstanding at January 1 (USD per share) \| $ / shares	$ 123.27
Weighted-average exercise price granted (USD per share) \| $ / shares	172.70
Weighted-average exercise price exercised (USD per share) \| $ / shares	46.22
Weighted-average exercise price canceled or expired (USD per share) \| $ / shares	168.28
Weighted-average exercise price outstanding at December 31 (USD per share) \| $ / shares	144.21
Weighted-average exercise price exercisable at December 31 (USD per share) \| $ / shares	$ 131.07

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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