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Immaterial Corrections (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Immaterial Corrections (Textual) [ Abstract]
Basic and diluted earnings per share related to discontinued operations	$ 4.83	$ 10.19	$ 8.10
Adjustments [Member]
Immaterial Corrections (Textual) [ Abstract]
Basic and diluted earnings per share		$ 0.07	$ (0.16)
Basic and diluted earnings per share related to discontinued operations		$ 0.03	$ (0.09)
Cumulative effect of retained earnings		$ 51	$ 66

X

- Definition

Cumulative effect of retained earnings.

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No definition available.

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- Definition

The amount of income (loss) derived from discontinued operations during the period, net of related tax effect, per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

+ References

No definition available.

+ Details

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- Definition

The amount of net income (loss) before extraordinary items per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

+ References

No definition available.

+ Details

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