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Financial Instruments And Risks - Summary of The Changes In Level 3 Instruments (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]      
Assets ¥ 248,890,247    
Assets 360,433,486 ¥ 248,890,247  
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member]      
Disclosure of fair value measurement of assets [line items]      
Assets 1,266,495 2,842,839 ¥ 2,632,890
Additions 131,829 0 1,353,173
Disposal (29,664) (1,266,827) (1,961,315)
Transfer into level 3 1,035,642 0 1,477,950
Transfer out of level 3 (3,047)    
Gains or losses recognized in profit or loss (1,136,022) (309,517) (659,859)
Assets ¥ 1,265,233 ¥ 1,266,495 ¥ 2,842,839