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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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Percentage of cash and cash equivalents held by subsidiaries and VIEs of total cash and cash equivalents of the Group.

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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.

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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