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Financial Assets At Amortized Cost - Disclosure of Carrying Amount of Financial Assets at Amortized Cost (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance ¥ 6,563,969    
Ending balance 3,784,613 ¥ 6,563,969  
Gross carrying amount [member]      
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance 7,735,834 10,010,959 ¥ 3,484,927
New financial assets originated or purchased 8,041,561 8,649,672 15,479,015
Write-offs (26,345) (234,275)  
Disposal in the current period (226,843)    
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (10,400,618) (10,690,522) (8,952,983)
Ending balance 5,123,589 7,735,834 10,010,959
Gross carrying amount [member] | Stage 1 [member]      
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance 5,512,867 7,223,195 2,578,915
New financial assets originated or purchased 7,437,143 8,590,588 15,379,522
Transfers     (2,403,628)
Transfer — From stage 1 to stage 3     (2,403,628)
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (10,240,254) (10,300,916) (8,331,614)
Ending balance 2,709,756 5,512,867 7,223,195
Gross carrying amount [member] | Stage 2 [member]      
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance   0 535,000
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets)     (535,000)
Ending balance     0
Gross carrying amount [member] | Stage 3 [member]      
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance 2,115,235 2,655,132 278,022
Transfers     2,403,628
Transfer — From stage 1 to stage 3     2,403,628
Write-offs (17,651) (221,754)  
Disposal in the current period (226,843)    
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (5,500) (318,143) (26,518)
Ending balance 1,865,241 2,115,235 2,655,132
Gross carrying amount [member] | POCI [Member]      
Disclosure of carrying amount of financial assets at amortized cost [Line Items]      
Beginning balance 107,732 132,632 92,990
New financial assets originated or purchased 604,418 59,084 99,493
Write-offs (8,694) (12,521)  
Financial assets de-recognized and other adjustments in the current period (including repayments of financial assets) (154,864) (71,463) (59,851)
Ending balance ¥ 548,592 ¥ 107,732 ¥ 132,632