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Principal Accounting Policies - Revenue recognition, cost of revenues and cash, cash equivalents and time deposits (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
item
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Revenue recognition        
Number of revenue models used for PC-client game services | item 2      
Practical expedients - financing component true      
Practical expedients - costs to obtain a contract true      
Cash, cash equivalents and time deposits        
Cash at bank and demand deposits ¥ 51,383,310 $ 7,039,485 ¥ 21,428,902  
PRC subsidiaries and VIEs        
Cash, cash equivalents and time deposits        
Cash and cash equivalent and time deposits held by PRC subsidiaries and VIEs | ¥ ¥ 41,100,000   ¥ 48,500,000  
Percentage of cash and cash equivalent and time deposits held by PRC subsidiaries and VIEs 31.70% 31.70% 39.30% 39.30%
Denominated in U.S. dollars        
Cash, cash equivalents and time deposits        
Cash at bank and demand deposits ¥ 20,300,000 $ 2,800,000 ¥ 11,100,000 $ 1,600,000
Time deposits ¥ 67,200,000 $ 9,300,000 ¥ 61,200,000 $ 8,600,000
Less than        
Revenue recognition        
Term of sublicenses of music contents 3 years      
Term of advertising service contracts 3 months      
Equal to or more than        
Revenue recognition        
Term of sublicenses of music contents 1 year