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Long-term Debt (Narrative) (Details) (USD $)
In Billions, unless otherwise specified |
3 Months Ended |
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Apr. 30, 2011
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| Long-term Debt | |
| Aggregate net proceeds from note issuance | $ 4.9 |
| Date of first repayment of long-term debt | October 15, 2011 |
| Repayment of debt, percentage of principal amount under normal conditions | 100.00% |
| X | ||||||||||
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- Definition
Date that the debt agreement requires the first payment to be made, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Proceeds from Issuance of Unsecured Debt, Net
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| X | ||||||||||
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- Definition
Repayment of debt, percentage of principal amount under normal conditions
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