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Other Long-term Assets (Details 3) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Housing loans made to employees
Term of staff housing loan (in years)	5 years
Staff housing loans outstanding repayable within 12 months	¥ 37.2	¥ 43.0
Equal to or more than
Housing loans made to employees
Interest rate on staff housing loan (as a percent)	1.50%	1.50%
Less than
Housing loans made to employees
Interest rate on staff housing loan (as a percent)	4.75%	4.75%

X

- References

No definition available.

+ Details

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Namespace Prefix:	ntes_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the interest rate on staff housing loans made by the entity during the period.

+ References

No definition available.

+ Details

Name:	ntes_InterestRateOnStaffHousingLoans
Namespace Prefix:	ntes_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents advances made to employees as housing loans and payable within 12 months.

+ References

No definition available.

+ Details

Name:	ntes_StaffHousingLoansCurrent
Namespace Prefix:	ntes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the term of staff housing loans made by the entity during the period.

+ References

No definition available.

+ Details

Name:	ntes_TermOfStaffHousingLoans
Namespace Prefix:	ntes_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: