Income Taxes (Details) (USD $) In Millions	3 Months Ended
Jun. 30, 2011	Jul. 31, 2011
Income Taxes (Textuals) [Abstract]
Total unrecognized tax benefits	$ 513
Tax benefits affecting effective tax rate	38
Time period for unrecognized tax benefits reversal	next P12M
Payment of interest accrued related to unrecognized tax benefits	92
Accrued penalties related to unrecognized tax benefits	0
Approximate amount that company expects to record as reversal of unrecognized tax benefits in third Quarter 2011	400
Approximate refund resulted from IRS audit for tax years 2004 through 2006		$ 40

Approximate amount that company expects to record as reversal of unrecognized tax benefits in specified period.

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- Definition

Income taxes.

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- Definition

Time period for unrecognized tax benefits reversal.

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- Definition

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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- Definition

The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 16

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph c

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
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-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
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