Unearned Revenue by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Contract With Customer Liability [Line Items]
Unearned revenue	$ 30,242	$ 32,720
Productivity and Business Processes
Contract With Customer Liability [Line Items]
Unearned revenue	13,753	14,864
Intelligent Cloud
Contract With Customer Liability [Line Items]
Unearned revenue	13,298	14,706
More Personal Computing
Contract With Customer Liability [Line Items]
Unearned revenue	$ 3,191	$ 3,150

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant