Equity Compensation Plans (Summary Of Stock Option Activity) (Details)	12 Months Ended
Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding balance - shares under option, beginning \| shares	10,765,195
Granted - shares under option \| shares	2,115,740
Exercised - shares under option \| shares	(2,757,815)
Forfeited/cancelled - shares under option \| shares	(355,371)
Outstanding balance - shares under option, ending \| shares	9,767,749
Vested and expected to vest on December 31, 2017 - shares under option \| shares	9,538,150
Exercisable on December 31, 2017 - shares under option \| shares	5,484,562
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding balance - weighted average exercise price, beginning \| $ / shares	$ 143.43
Granted - weighted average exercise price \| $ / shares	167.92
Exercised - weighted average exercise price \| $ / shares	91.34
Forfeited/cancelled - weighted average exercise price \| $ / shares	195.59
Outstanding balance - weighted average exercise price, ending \| $ / shares	161.54
Vested and expected to vest on December 31, 2017 - weighted average exercise price \| $ / shares	161.10
Exercisable on December 31, 2017 - weighted average exercise price \| $ / shares	$ 137.92

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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Net 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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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