Benefit Plans (Stock Options Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Benefit Plans [Abstract]
Shares, Outstanding at beginning of year	3,343,974	3,486,912	3,697,018
Weighted Average Exercise Price, Outstanding at beginning of year	$ 18	$ 18	$ 17
Shares, Granted		135,183	8,352
Weighted Average Exercise Price, Granted		$ 12	$ 11
Shares, Exercised		(24,829)	(5,513)
Weighted Average Exercise Price, Exercised		$ 11	$ 11
Shares, Forfeited or expired	(486,445)	(253,292)	(212,945)
Weighted Average Exercise Price, Forfeited or expired	$ 16	$ 14	$ 15
Shares, Outstanding at end of year	2,857,529	3,343,974	3,486,912
Weighted Average Exercise Price, Outstanding at end of year	$ 18	$ 18	$ 18
Shares, Exercisable at year-end	2,607,442	2,859,749	2,838,014
Weighted Average Exercise Price, Exercisable at year-end	$ 19	$ 18	$ 18
Weighted-average fair value of options granted during the year		$ 2.13	$ 2.38

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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 weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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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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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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

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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 stock options awarded under the plan during the reporting 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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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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