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Retirement Plans (Details 5) - USD ($) $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015
Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 4,119	$ 3,565
Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		12,499	11,953
Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		48
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 568	$ 738
Actual %		2.00%	3.00%
Target %		0 - 5%	0 - 5%
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 76	$ 36
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		492	702
U.S. Large Cap Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 3,257	$ 4,291
Actual %		14.00%	19.00%
U.S. Large Cap Equity [Member] | Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 750	$ 302
U.S. SMID Cap Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 913	$ 979
Actual %		4.00%	4.00%
U.S. SMID Cap Equity [Member] | Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 913	$ 979
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 3,381	$ 3,064
Actual %		15.00%	14.00%
International Equity Securities [Member] | Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 2,685	$ 2,429
International Equity Securities [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		121	1
Global Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 2,794	$ 2,579
Actual %		12.00%	11.00%
Total Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		35 - 55%	35 - 55%
Corporate Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 6,608	$ 6,455
Actual %		29.00%	28.00%
Corporate Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 6,608	$ 6,455
Government Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 5,148	$ 4,645
Actual %		22.00%	20.00%
Government Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 5,148	$ 4,645
Mortgage Backed And Other Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 347	$ 213
Actual %		2.00%	1.00%
Mortgage Backed And Other Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 146	$ 153
Total Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target %		45 - 65%	45 - 65%
Alternative investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 322	$ 226
Actual %		1.00%	1.00%
Target %		0 - 5%	0 - 5%
Alternative investments [Member] | Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 48
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ (321)	$ (184)
Actual %		(1.00%)	(1.00%)
Other Investments [Member] | Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ (305)	$ (181)
Other Investments [Member] | Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ (16)	$ (3)
Total Asset Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual %		100.00%	100.00%
[1] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the total.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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