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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Income Taxes (Textual) [Abstract]
Total unrecognized tax benefits	$ 157
Tax benefits affecting effective tax rate	47
Reversal of unrecognized tax benefits within the next twelve months	60
Time period for unrecognized tax benefits reversal	Next twelve months
Payment of interest accrued	80
Accrued penalties related to unrecognized tax benefits	$ 0

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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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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