Long-Term Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2011 Y
Stock option activity
Number of Options, Beginning balance	1,438,514
Weighted Average Exercise Price, Beginning	$ 66.89
AMB awards	9,052,566
Weighted Average Exercise Price, AMB awards	$ 30.66
Settled	(124,278)
Weighted Average Exercise Price, Settled	$ 71.64
Exercised	(249,813)
Weighted Average Exercise Price, Exercised	$ 22.01
Forfeited	(237,029)
Weighted Average Exercise Price, Forfeited	$ 59.88
Number of Options, Ending balance	9,879,960
Weighted Average Exercise Price, Ending Balance	$ 34.93
Options Exercisable ,Number of Options Ending balance	8,239,656
Options Exercisable, Weighted Average Exercise Price, Ending Balance	$ 37.13
Options Exercisable, Weighted Average Life (in years)	4.4

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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 period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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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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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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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