Retirement Plans (Details 9) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]
Fair value of plan assets	$ 23,867	$ 23,099
PBO	(29,251)	(27,132)
Net funded status	$ (5,384)	$ (4,033)

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation.

No definition available.

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- References

No definition available.

+ Details

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- Definition

If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920

+ Details

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

+ Details

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