Certain Employee Benefit and Stock-Based Compensation Plans (Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data	9 Months Ended
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options, beginning balance	21,039
Stock options granted during the period	833
Stock options exercised during the period	(168)
Stock options cancelled during the period	(2,604)
Outstanding stock options, ending balance	19,100
Weighted-average exercise price, beginning of period	$ 92.25
Weighted-average exercise price of shares granted during period	$ 64.04
Weighted-average exercise price of shares exercised during period	$ 45.07
Weighted-average exercise price of shares cancelled during period	$ 130
Weighted-average exercise price, end of period	$ 86.22
Shares exercisable at end of period	12,957
Weighted average exercisable price of shares exercisable at end of period	$ 104
Employee Stock Option Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options, beginning balance	19,825
Stock options granted during the period	833
Stock options exercised during the period	(168)
Stock options cancelled during the period	(2,363)
Outstanding stock options, ending balance	18,127
Weighted-average exercise price, beginning of period	$ 56.36
Weighted-average exercise price of shares granted during period	$ 64.04
Weighted-average exercise price of shares exercised during period	$ 45.07
Weighted-average exercise price of shares cancelled during period	$ 73.82
Weighted-average exercise price, end of period	$ 54.54
Shares exercisable at end of period	11,984
Weighted average exercisable price of shares exercisable at end of period	$ 57.81
Stock Options Converted From National City Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options, beginning balance	1,214
Stock options cancelled during the period	(241)
Outstanding stock options, ending balance	973
Weighted-average exercise price, beginning of period	$ 678
Weighted-average exercise price of shares cancelled during period	$ 686
Weighted-average exercise price, end of period	$ 674
Shares exercisable at end of period	973
Weighted average exercisable price of shares exercisable at end of period	$ 676

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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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 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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