Stock-Based Compensation (Summary Of Changes Of Stock Options) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Share-based Compensation [Abstract]
Outstanding at December 31, 2011, Shares	15.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(1.5)
Forfeited / expired, Shares	(1.7)
Outstanding at September 30, 2012, Shares	12.2
Outstanding at December 31, 2011, Weighted Average Exercise Price	$ 21
Share Based Compensation Arrangement By Share Based Payment Award, Options Exercises In Period, Weighted Average Ex Price	$ 8
Forfeited / expired, Weighted Average Exercise Price	$ 26
Outstanding at September 30, 2012, Weighted Average Exercise Price	$ 22
Outstanding at December 31, 2011, Exercisable at Period End	9.8
Outstanding at September 30, 2012, Exercisable at Period End	9.9
Outstanding at period end, Aggregate Intrinsic Value Exercisable	$ 14.8	$ 5.4

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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.

+ References

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-Name Accounting Standards Codification

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- Definition

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.

+ References

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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.

+ References

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

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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- Definition

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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No definition available.

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

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