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Stock-Based Compensation (Summary Of Option And SOSAR Activity Under Incentive Plan) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock-Based Compensation [Abstract]
Outstanding, beginning of year, Shares	1,132
Outstanding, beginning of year, Weighted-Average Exercise Price	$ 457.14
Granted, Shares	116
Granted, weighted-average exercise price	$ 874.14
Exercised, Shares	(470)
Exercised, Weighted-Average Exercise Price	$ 433.10
Forfeited or cancelled, Shares	(30)
Forfeited or cancelled, Weighted-Average Exercise Price	$ 513.19
Outstanding, end of year, Shares	748
Outstanding, end of year, Weighted-Average Exercise Price	$ 533.71
Outstanding, Weighted-Average Remaining Years of Contractual Life	3 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 637,905	$ 430,595
Exercisable, Shares	235
Exercisable, Weighted-Average Exercise Price	$ 476.68
Exercisable, Weighted-Average Remaining Years of Contractual Life	1 year 7 months 6 days
Exercisable, Aggregate Intrinsic Value	$ 213,697
Vested and expected to vest, shares	728
Vested and expected to vest, Weighted-Average Exercise Price	$ 528.03
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life	3 years 10 months 24 days
Vested and expected to vest, Aggregate Intrinsic Value	$ 625,050

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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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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of 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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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