Discontinued Operations (Details Textual) (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended
May 05, 2011	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations (Textual) [Abstract]
Gain from disposal of discontinued operations, net of tax	$ 312	$ 7	$ 312
Tax effect on gain from disposal of discontinued operations	0	0
Gain realized on settlement of obligation		$ 7

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: 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.

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