Employee Incentive, Deferred Compensation, And Retirement Plans (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to grant	7,700,000
Stock-based compensation	$ 40,747,000	$ 26,411,000	$ 190,731,000
Total intrinsic value of options exercised	19,200,000	3,700,000	13,900,000
Cash proceeds from the exercise of stock options	4,200,000	1,400,000	2,000,000
Tax benefits realized from the exercise of stock options	7,500,000	1,400,000	5,700,000
Options outstanding under the plan	249,000	983,000
Fair value of options vested		700,000	2,900,000
Investments	236,434,000	239,208,000
Deferred compensation liability	16,600,000	24,500,000
Charge related to the modification of the Company's deferred compensation plan			179,500,000
ESOP compensation expense	1,700,000	1,700,000	1,700,000
ESOP trust owned shares	732,106	722,233
Shares held as collateral	24,405	73,215
Shares held as collateral at fair value	800,000	2,300,000
Contributions by employer	3,700,000	3,600,000	3,300,000
Incentive Stock Award Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period	10 years
Stock-based compensation	(51,400,000)	29,500,000	(203,800,000)
Tax benefit related to stock-based compensation recognized in shareholders' equity	16,700,000	24,900,000	17,500,000
Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested options	209,400,000
Weighted-average period, compensation cost expected to recognized, in years	3 years 2 months 12 days
Total number of stock units outstanding	15,500,000
Unvested stock units outstanding	6,551,000	3,764,000
Percentage of deferred earnings	1.00%
SWAP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of stock units outstanding	15,300,000
Percentage of incentive compensation deferred into company stock units	15.00%
Percentage of earnings deferred into company stock units	4.00%
Percentage of earnings deferred into company stock units, Company match	25.00%
Elective deferrals vested percentage	100.00%
Mutual Funds [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of earnings deferred into company stock units, Company match	25.00%
Percentage of earnings deferred into mutual funds	2.00%
Investments	$ 18,000,000	$ 34,000,000
Maximum [Member] \| Incentive Stock Award Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	8 years
Maximum [Member] \| Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	8 years
Maximum [Member] \| Deferred Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	8 years
Maximum [Member] \| SWAP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	7 years
Minimum [Member] \| Incentive Stock Award Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	3 years
Minimum [Member] \| Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	3 years
Minimum [Member] \| Deferred Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	5 years
Minimum [Member] \| SWAP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period in years	3 years

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Percentage of deferred earnings

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Share Based Compensation Arrangement By Share Based Payment Award Expiration In Years

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of increase or decrease in net periodic benefit cost related to the effects of a change in the substantive terms of an existing defined benefit plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The amount of plan compensation cost recognized during the period.

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Represents the carrying amount of shares held by the ESOP as of the balance sheet date in which no ESOP participant has a vested interest and no lender has a claim.

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The fair value of shares held by the ESOP as of the balance sheet date in which no ESOP participant has a vested interest and no lender has a claim. The fair value of an ESOP share is the amount the seller could reasonably expect to receive for it in a current sale between a willing buyer and a willing seller, that is, other than in a forced or liquidation sale, which would be the market price of the stock if it is publicly traded.

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Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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