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Significant Accounting Policies - Sales & marketing expenses, Share-based compensation & Employees benefits & Taxation (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Accounting Policies
Advertising expenses	¥ 3,006.0	¥ 934.7	¥ 436.5
Cumulative share-based compensation expenses			¥ 28.9

X

- Definition

Amount of cumulative share-based compensation expense recorded upon completion of IPO.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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