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Unearned Revenue - Additional Information (Detail) $ in Billions	Dec. 31, 2020 USD ($)
Contract With Customer Liability [Line Items]
Revenue allocated to remaining performance obligations	$ 117
Commercial Customers
Contract With Customer Liability [Line Items]
Revenue allocated to remaining performance obligations	$ 112

X

- Definition

Contract with Customer Liability [Line Items]

+ References

No definition available.

+ Details

Name:	msft_ContractWithCustomerLiabilityLineItems
Namespace Prefix:	msft_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_MajorCustomersAxis=msft_CommercialCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: