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Significant Accounting Policies - Convenience Translation, Cash & cash equivalents, restricted cash and time deposits (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥)
Cash and cash equivalents and time deposits |  |  |  |  |
Convenience translation rate (USD to RMB) | 7.2993 |  | 7.2993 |  |
Cash and cash equivalents and time deposits |  |  |  |  |
Cash and cash equivalents | ¥ 10,249,382 | ¥ 7,191,821 | $ 1,404,160 |  | ¥ 10,172,584
Time deposits | 3,588,475 | 5,194,891 | 491,619 |  |
Restricted cash | 50,000 | 50,000 |  |  |
PRC Subsidiaries and Variable Interest Entities |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |
Cash and cash equivalents | ¥ 8,165,700 | ¥ 5,632,100 |  |  |
Cash and cash equivalents held by PRC subsidiaries and VIEs (as a percent) | 80.00% | 78.00% |  |  |
Cash held in accounts managed by online payment platforms |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |
Cash and cash equivalents | ¥ 65,900 | ¥ 43,000 |  |  |
Denominated in US dollars |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |
Cash and cash equivalents | 2,840,700 | 1,286,500 | 395,200 | $ 181,600 |
Time deposits | ¥ 3,588,500 | ¥ 5,194,900 | $ 499,200 | $ 733,500 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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