Operating Segments and Related Information - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
May 31, 2019	May 31, 2018	May 31, 2017
Regional Reporting Disclosure [Line Items]
Revenues	$ 39,117	$ 36,397	$ 34,350
UNITED STATES
Regional Reporting Disclosure [Line Items]
Revenues	16,091	15,314	$ 15,778
Long-lived assets attributable to operations (Domestic)	3,174	2,930
BELGIUM
Regional Reporting Disclosure [Line Items]
Long-lived assets attributable to operations (Domestic)	618	534
CHINA
Regional Reporting Disclosure [Line Items]
Long-lived assets attributable to operations (Domestic)	$ 242	$ 262

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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