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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Estimated annual tax rate	27.00%	27.00%
Benefit reflecting the impact of the American Taxpayer Relief Act			$ 7

- Definition

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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