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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Allegheny	Mar. 31, 2011 Allegheny
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits			$ 21
Unrecognized tax benefits expected to resolved within the next twelve month	45
Unrecognized benefits (if recognized) affecting effective tax rate	10
Increase in accrued interest				6
Accrued Interest	12	11
Change in effective tax rate as a result of non-deductible portion of merger transaction and integration costs	$ 30

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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- Definition

This element represents interest expense recognized 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.

+ References+ Details