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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Entity Registrant Name Bilibili Inc.
Entity Central Index Key 0001723690
Document Type 20-F
Document Period End Date Dec. 31, 2020
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Document Annual Report true
Document Transition Report false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
Document Shell Company Report false
Entity File Number 001-38429
Entity Incorporation, State or Country Code E9
Document Registration Statement false
Entity Address, Address Line One Building 3, Guozheng Center, No. 485 Zhengli Road, Yangpu District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200433
Entity Address, Country CN
ICFR Auditor Attestation Flag true
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Xin Fan
Entity Address, Address Line One Building 3, Guozheng Center, No. 485 Zhengli Road, Yangpu District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200433
Entity Address, Country CN
Country Region 86
City Area Code 21
Local Phone Number 25099255
Contact Personnel Email Address sam@bilibili.com
Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 351,919,952
Class Z Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 268,204,838
Common Stock, Capital Shares Reserved for Future Issuance 3,302,327
Title of 12(b) Security Class Z ordinary shares, par value US$0.0001 per share
No Trading Symbol Flag true
Class Y Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 83,715,114
American Depositary Shares  
Document Information [Line Items]  
Title of 12(b) Security American depositary shares, each representing one Class Z ordinary share
Security Exchange Name NASDAQ
Trading Symbol BILI