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General (Details 3) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Feb. 29, 2016	Feb. 29, 2016	Feb. 28, 2015
Treasury Shares [Abstract]
Treasury Stock Acquired, Average Cost Per Share	$ 140.42
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased	25,000,000	25,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	22,800,000	22,800,000
Stock Repurchase Authorization Shares Purchased Under Previously Authorized Share Repurchase Program		15,000,000
Number of Shares Repurchased	7,300,000
Payments for Repurchase of Common Stock	$ 1,000	$ 2,133	$ 1,016

X

- Definition

Number of shares authorized for repurchase under previously authorized share repurchase program.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

The cash outflow to reacquire common stock during the period.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=56944662&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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X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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