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RELATED PARTY TRANSACTIONS, Related Parties (Details)	6 Months Ended
	Jun. 30, 2021
Tencent Limited and its affiliates ("Tencent") [Member]
Related Parties [Abstract]
Relationship with the Company	A shareholder of the Company	[1]
[1] These are the related parties that have engaged in significant transactions with the Company for the six months ended June 30, 2020 and 2021.

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- References

No definition available.

+ Details

Name:	se_RelatedPartiesAbstract
Namespace Prefix:	se_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous.

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No definition available.

+ Details

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

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=se_TencentLimitedAndItsAffiliatesTencentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: