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Goodwill (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying value of reporting unit	1.00%

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of carrying value of reporting unit.

+ References

No definition available.

+ Details

Name:	yy_CarryingValueOfReportingUnit
Namespace Prefix:	yy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration