Stock-Based Compensation (Details 2) (USD $)	9 Months Ended
Sep. 30, 2011
Stock Options
Stock options outstanding at beginning of period	24,912,261
Stock options granted	7,676,544
Stock options exercised	(3,514,758)
Stock options canceled	(403,223)
Reduction in stock options outstanding as a result of spin-off	(6,989,110)
Stock options outstanding at end of period	21,681,714
Weighted average exercise price of stock options outstanding at beginning of period	$ 24.85
Weighted average exercise price per share of award options granted	$ 32.30
Weighted average exercise price per share of options exercised	$ 15.05
Weighted average exercise price of stock options canceled	$ 23.11
Weighted average exercise price of stock options no longer outstanding due to spin-off	$ 30.94
Weighted average exercise price of stock options outstanding at end of period	$ 24.47

The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the 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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For presentations that combine terminations, the weighted average price of expired options and the 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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The quantity of shares issuable on stock options awarded under the plan during the reporting 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 addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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The weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance under the stock option 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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