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Financial Assets At Amortized Cost - Disclosure of Movement of ECL Allowance of Financial Assets At Amortized Cost (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance ¥ 6,563,969    
Ending balance 3,784,613 ¥ 6,563,969  
Allowance for credit losses [member]      
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance 1,171,865 1,387,947 ¥ 377,080
New financial assets originated or purchased 10,808 8,593 63,411
Transfers     1,062,156
Net impact on expected credit loss by stage transfer     1,062,156
Write-offs (26,345) (234,275)  
Disposal in the current period (144,320)    
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) 33,287 (19,721) (166,845)
Change in parameters of expected credit loss model 293,681 29,321 52,145
Ending balance 1,338,976 1,171,865 1,387,947
Stage 1 [member] | Allowance for credit losses [member]      
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance 5,160 13,997 16,492
New financial assets originated or purchased 10,808 8,593 64,072
Transfers     (10,014)
Transfers In Financial Assets At Amortised Cost From stage 1 to stage 3     (10,014)
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (4,531) (4,160) (50,718)
Change in parameters of expected credit loss model 467 (13,270) (5,835)
Ending balance 11,904 5,160 13,997
Stage 2 [member] | Allowance for credit losses [member]      
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance 0 0 111,437
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets)     (111,437)
Ending balance   0 0
Stage 3 [member] | Allowance for credit losses [member]      
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance 1,140,348 1,321,133 249,080
Transfers     1,072,170
Net impact on expected credit loss by stage transfer     1,062,156
Write-offs (17,651) (221,754)  
Disposal in the current period (144,320)    
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (10,366) (15,444) (2,758)
Change in parameters of expected credit loss model 312,491 56,413 2,641
Ending balance 1,280,502 1,140,348 1,321,133
POCI [Member] | Allowance for credit losses [member]      
Disclosure of movement of ECL allowance of financial assets at amortized cost [Line Items]      
Beginning balance 26,357 52,817 71
New financial assets originated or purchased     (661)
Write-offs (8,694) (12,521)  
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) 48,184 (117) (1,932)
Change in parameters of expected credit loss model (19,277) (13,822) 55,339
Ending balance ¥ 46,570 ¥ 26,357 ¥ 52,817