Stock-Based Incentive Plan (Stock Option Activity) (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Stock-Based Incentive Plan
Number of Shares Under Option, Outstanding, Beginning balance	23,840,049
Weighted Average Exercise Price per Share, Outstanding, Beginning balance	$ 15.99
Number of Shares Under Option, Options granted	4,292,178
Weighted Average Exercise Price per Share, Options granted	$ 22.73
Number of Shares Under Option, Options exercised	(4,100,541)
Weighted Average Exercise Price per Share, Options exercised	$ 15.01
Number of Shares Under Option, Options forfeited	(301,880)
Weighted Average Exercise Price per Share, Options forfeited	$ 17.59
Number of Shares Under Option, Outstanding, Ending balance	23,729,806
Weighted Average Exercise Price per Share, Outstanding, Ending balance	$ 17.36
Number of Shares Under Option, Vested and expected to vest	22,459,361
Weighted Average Exercise Price per Share, Vested and expected to vest	$ 17.28
Number of Shares Under Option, Options exercisable	14,640,269
Weighted Average Exercise Price per Share, Options exercisable	$ 16.11

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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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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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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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

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