Consolidated Statements of Changes in Shareholders Equity and Comprehensive Income (Parenthetical) (USD $) In Millions, except Share data	12 Months Ended
May 31, 2011	May 31, 2010	May 31, 2009	May 31, 2008
Additional Paid-In Capital
Employee incentive plans and other, shares issued	2,229,051	2,375,753	995,271
Retained Earnings
Cash dividends declared, per share	$ 0.48	$ 0.44	$ 0.44
Adjustment to opening balances for retirement plans measurement date transition, tax benefit				$ 26
Accumulated Other Comprehensive Income
Foreign currency translation adjustments, tax	27	2	28
Retirement plans adjustments, tax	141	617	718
Adjustment to opening balances for retirement plans measurement date transition, tax expense				$ 220

The tax effect of the adjustment increasing (decreasing) retained earnings due to a change in the measurement date for a defined benefit pension and other postretirement plan in the initial application of the measurement provisions of current pension accounting guidance.

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- Definition

The tax effect of the adjustment increasing (decreasing) accumulated other comprehensive income/loss due to a change in the measurement date for a defined benefit pension and other postretirement plan in the initial application of the measurement provisions of current pension accounting guidance.

+ Details

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

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- Definition

Tax effects of the net changes to accumulated comprehensive income during the period related to benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 25

+ Details

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- Definition

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity.

+ References

+ Details

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- Definition

Number of shares issued during the period as a result of any share-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 5

+ Details

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