Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Long-term Debt (Details) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended
	Apr. 30, 2014 USD ($)	Apr. 30, 2013 USD ($)	Apr. 30, 2014 1.000% Debt Issuance, Due 2017 [Domain] USD ($)	Apr. 30, 2014 3.300% Debt Issuance, Due 2024 [Domain] USD ($)	Apr. 30, 2014 4.300% Debt Issuance, Due 2044 [Domain} USD ($)	Apr. 30, 2014 3.000% Debt, Due 2014 [Domain] USD ($)	Apr. 30, 2014 1.625% Debt, Due 2014 [Domain] USD ($)	Apr. 30, 2014 April 8, 2014 Debt Issuance [Member] USD ($)	Apr. 30, 2014 April 22, 2014 Debt Issuance [Member] USD ($)	Apr. 30, 2014 Euro Member Countries, Euro 1.900% Debt Issuance, Due 2022 [Domain] EUR (€)	Apr. 30, 2014 Euro Member Countries, Euro 2.500% Debt Issuance, Due 2026 [Domain] EUR (€)	Apr. 30, 2014 Euro Member Countries, Euro April 8, 2014 Debt Issuance [Member] EUR (€)
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 500	$ 1,000	$ 1,000				$ 2,500	€ 850	€ 650	€ 1,500
Debt Instrument, Interest Rate, Stated Percentage			1.00%	3.30%	4.30%	3.00%	1.625%			1.90%	2.55%
Payments of long-term debt	1,574	1,088				500	1,000
Proceeds from Issuance of Debt	$ 4,519							$ 2,000	$ 2,500