Stock Based Compensation (Details 1) (USD $) In Millions, except Share data	9 Months Ended
Sep. 30, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding at January 1, 2011	4,827,457
Granted	0
Exercised	(1,541,690)
Forfeitured and expired	(21,963)
Options outstanding at September 30, 2011	3,263,804
Options exercisable at September 30, 2011	2,597,318
Weighted Average Exercise Price Per Share - Options outstanding at January 1, 2011	$ 41.09
Weighted Average Exercise Price Per Share - Granted	$ 0.00
Weighted Average Exercise Price Per Share - Exercised	$ 40.52
Weighted Average Exercise Price Per Share - Forfeitured and expired	$ 43.41
Weighted Average Exercise Price Per Share - Options outstanding at September 30, 2011	$ 41.34
Weighted Average Exercise Price Per Share - Options exercisable at September 30, 2011	$ 42.30
Aggregate Intrinsic Value - Options outstanding at September 30, 2011	$ 26
Aggregate Intrinsic Value - Options exercisable at September 30, 2011	$ 18

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 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 total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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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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