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Restricted short-term deposits (Narrative) (Details) - Dec. 31, 2019 ¥ in Thousands, $ in Millions, $ in Millions	USD ($)	CNY (¥)	HKD ($)
Restricted Cash And Investments [Line Items]
Restricted Of Short Term Deposit		¥ 653,034
Loans Payable
Restricted Cash And Investments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 40		$ 320

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- References

No definition available.

+ Details

Name:	yy_RestrictedCashAndInvestmentsLineItems
Namespace Prefix:	yy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of restricted short-term deposit.

+ References

No definition available.

+ Details

Name:	yy_RestrictedOfShortTermDeposit
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=us-gaap_LoansPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: