Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	0 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months
Stock option activity, outstanding
Outstanding, beginning balance, shares	3.9	5.7	7.8
Granted, shares	0.7	0.7	0.3
Exercised, shares	(1.0)	(0.2)	0
Forfeited/cancelled, shares	(2.4)	(2.3)	(2.4)
Outstanding, ending balance, shares	1.2	3.9	5.7
Exercisable, ending balance, shares	0.3	3.2	5.7	7.8
Granted, weighted average exercise price	$ 12.79	$ 13.79	$ 10.88
Exercised, weighted average exercise price	$ 11.62	$ 11.68	$ 11.74
Forfeited/cancelled, weighted average exercise price	$ 31.33	$ 41.50	$ 31.14
Outstanding, weighted average exercise price	$ 12.91	$ 23.90	$ 31.66	$ 32.21
Exercisable, weighted average exercise price	$ 11.86	$ 25.97	$ 31.66	$ 32.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares	1.2	3.9	5.7
Outstanding, weighted average exercise price	$ 12.91	$ 23.90	$ 31.66	$ 32.21
Exercisable, shares	0.3	3.2	5.7	7.8
Exercisable, weighted average exercise price	$ 11.86	$ 25.97	$ 31.66	$ 32.21
$0.0 to $11.55 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	1 year 2 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 2 months
Stock option activity, outstanding
Outstanding, ending balance, shares	0.2
Exercisable, ending balance, shares	0.2
Outstanding, weighted average exercise price	$ 11.20
Exercisable, weighted average exercise price	$ 11.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares	0.2
Outstanding, weighted average exercise price	$ 11.20
Exercisable, shares	0.2
Exercisable, weighted average exercise price	$ 11.20
Range of Exercise Prices lower range limit	$ 0.00
Range of Exercies Prices upper range limit	$ 11.55
$11.56 to $21.81 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	0 years 1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 8 months
Stock option activity, outstanding
Outstanding, ending balance, shares	1.0
Exercisable, ending balance, shares	0.1
Outstanding, weighted average exercise price	$ 13.25
Exercisable, weighted average exercise price	$ 13.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares	1.0
Outstanding, weighted average exercise price	$ 13.25
Exercisable, shares	0.1
Exercisable, weighted average exercise price	$ 13.12
Range of Exercise Prices lower range limit	$ 11.56
Range of Exercies Prices upper range limit	$ 21.81

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

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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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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

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