Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options outstanding, Beginning balance	9,639,849
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share)	$ 80.06
Number of options granted	611,700
Options granted, Weighted-average exercise price (in usd per share)	$ 63.17
Number of options exercised	(2,852,350)
Options exercised, Weighted-average exercise price (in usd per share)	$ 68.19
Number of Options forfeited/expired	(117,803)
Options forfeited/expired, Weighted-average exercise price (in usd per share)	$ 82.48
Number of options outstanding, Ending balance	7,281,396	9,639,849
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share)	$ 83.25	$ 80.06
Weighted-Average Contractual Life, Options outstanding	4 years 3 months 20 days
Options exercisable, Number of Options	6,232,998
Options exercisable, Weighted-Average Exercise Price (in usd per share)	$ 86.41
Options exercisable, Aggregate intrinsic value (in usd per share)	$ 6,657,504
Weighted-Average Contractual Life, Options exercisable	3 years 7 months 7 days
Weighted-average grant-date fair value of options granted (in USD per share)	$ 8.71	$ 8.00	$ 9.42

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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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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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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