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Significant Accounting Policies - Schedule of supplemental cash flow information related to operating leases (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash Flow, Operating Activities, Lessee [Abstract] |  |  |
Cash payments for operating leases | ¥ 198,418 | ¥ 206,518 | ¥ 200,376
Right-of-use assets obtained/(released) in exchange for operating lease liabilities | ¥ 15,979 | ¥ (60,910) | ¥ 467,765

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- Definition Amount of increase or decrease in right-of-use asset obtained in exchange for operating lease liability. + References No definition available. + Details
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Namespace Prefix: | bili_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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