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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, 2023
CNY (¥)
item
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
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 ¥ 21,428,902 $ 3,018,198 ¥ 24,889,000  
PRC subsidiaries and VIEs        
Cash, cash equivalents and time deposits        
Cash and cash equivalent and time deposits held by PRC subsidiaries and VIEs | ¥ ¥ 48,500,000   ¥ 48,100,000  
Percentage of cash and cash equivalent and time deposits held by PRC subsidiaries and VIEs 39.30% 39.30% 42.60% 42.60%
Denominated in U.S. dollars        
Cash, cash equivalents and time deposits        
Cash at bank and demand deposits ¥ 11,100,000 $ 1,600,000 ¥ 4,300,000 $ 623,800
Time deposits ¥ 61,200,000 $ 8,600,000 ¥ 58,600,000 $ 8,400,000
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