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Critical accounting estimates and judgments (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets      
Amortization ¥ 162,121,000 ¥ 302,774,000 ¥ 282,697,000
Preferential income tax rate 15.00%    
Expiration period 10 years    
Original cost ¥ 570,436,000 687,194,000 917,063,000
Gross carrying amount      
Disclosure of detailed information about intangible assets      
Original cost 2,228,669,000 2,193,000,000  
Application And Platform [Member]      
Disclosure of detailed information about intangible assets      
Carrying amount ¥ 191,070,000 257,118,000  
Application And Platform [Member] | Bottom of range [Member]      
Disclosure of detailed information about intangible assets      
Useful life 3 years    
Useful life for 2 years | Application And Platform [Member]      
Disclosure of detailed information about intangible assets      
Amortization ¥ 196,209,000 184,392,000 388,259,000
Useful life 2 years    
Useful life for 5 years | Application And Platform [Member]      
Disclosure of detailed information about intangible assets      
Amortization ¥ 78,484,000 ¥ 160,381,000 ¥ 155,303,000
Useful life 5 years