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Employee Benefits (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Benefits
Contributions to medical and pension schemes	¥ 769.4	¥ 903.4	¥ 788.7
Other employee benefits	766.8	631.8	548.6
Total group's employee welfare benefits expense	¥ 1,536.2	¥ 1,535.2	¥ 1,337.3

X

- Definition

Represents the amount of the cost recognized during the period for medical and pension schemes under defined contribution plans.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of the cost recognized during the period for other employee benefits under defined contribution plans.

+ References

No definition available.

+ Details

Name:	ntes_DefinedContributionPlanCostRecognizedOtherEmployeeBenefits
Namespace Prefix:	ntes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration