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Notes Payable and Long-Term Debt	3 Months Ended
	Apr. 30, 2016
Debt Disclosure [Abstract]
Notes Payable and Long-Term Debt	Notes Payable and Long-Term Debt We obtain short-term financing from time to time under our commercial paper program, a form of notes payable. No balances were outstanding at any time during 2016 or 2015. In April 2016, we issued unsecured fixed rate debt of $1 billion at 2.5% that matures in April 2026 and $1 billion at 3.625% that matures in April 2046. During the three months ended April 30, 2016, we used cash on hand and proceeds from these issuances to repurchase $565 million of debt before its maturity at a market value of $820 million. We recognized a loss on early retirement of $261 million, which was recorded in net interest expense in our Consolidated Statements of Operations. We used cash on hand and proceeds from the April issuances in May 2016 to repurchase an additional $824 million of debt before its maturity at a market value of $981 million. We recognized an additional loss on early retirement of approximately $160 million in the second quarter. The $824 million of debt repurchased during the second quarter of 2016 was classified as current in our Consolidated Statements of Financial Position at April 30, 2016.

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- References

No definition available.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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