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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Effective tax rate (in hundredths)	32.00%	12.00%
Tax Adjustments, Settlements, and Unusual Provisions		$ 10
Period of time extended under the American Taxpayer Relief Act of 2012	1 year
Depreciation Bonus for qualified long-lived assets under American Taxpayer Relief Act of 2012	50.00%

- 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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