Discontinued Operations (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Discontinued Operations (Textuals) [Abstract]
Income (loss) from discontinued operations, net of income tax	$ 14	$ (40)
Real Estate [Member]
Discontinued Operations (Textuals) [Abstract]
Real Estate Held-for-sale	12		114
Income (loss) from discontinued operations, net of income tax	$ 14	$ 21

This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Number 144

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Publisher SEC

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+ Details