Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Income Taxes (Textual) [Abstract]
Income tax provision	$ 10	$ 21
Effective tax rate	19.10%	24.80%
Likelihood of uncertain tax positions	greater than 50%
Tax benefit	50.00%
Unrecognized tax benefits	8
Period for unrecognized tax benefit significant change	12 months
Interest accrued for unrecognized tax benefits	$ 1

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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