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Loans To Customers - Summary of Movement In Loans To Customers (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance ¥ 232,027,821    
Ending balance 342,848,611 ¥ 232,027,821  
Loans and receivables, category [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 120,815,019 48,749,826 ¥ 36,021,540
New loans originated 234,198,681 141,924,691 53,015,937
Loans de-recognized and other adjustments in the current period (including repayments of loans) (136,440,336) (68,678,186) (40,008,359)
Write-offs (847,383) (1,181,312) (279,292)
Ending balance 217,725,981 120,815,019 48,749,826
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   47,052,175 33,787,721
New loans originated     53,015,937
Transfers     (1,207,945)
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (38,543,538)
Ending balance     47,052,175
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 119,568,582 47,052,175  
New loans originated 234,198,681 141,924,691  
Transfers (5,530,212) (2,124,274)  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (132,711,645) (67,284,010)  
Ending balance 215,525,406 119,568,582 47,052,175
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   324,440 439,915
Transfers     116,102
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (231,577)
Ending balance     324,440
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 839,817 324,440  
Transfers 4,439,585 1,713,887  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (3,703,157) (1,198,510)  
Ending balance 1,576,245 839,817 324,440
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   1,373,211 1,793,904
Transfers     1,091,843
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (1,233,244)
Write-offs     (279,292)
Ending balance     1,373,211
Loans and receivables, category [member] | Gross carrying amount [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 406,620 1,373,211  
Transfers 1,090,627 410,387  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (25,534) (195,666)  
Write-offs (847,383) (1,181,312)  
Ending balance 624,330 406,620 1,373,211
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (274,558)
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (5,579,855) (1,806,096)  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     274,558
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 5,579,855 1,806,096  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 3 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (935,301)
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 3 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   (324,045)  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     935,301
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 1 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   324,045  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     1,914
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 49,643 5,867  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (1,914)
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (49,643) (5,867)  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 3 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (157,987)
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 3 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (1,091,109) (98,355)  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 3 | Financial instruments credit-impaired [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     157,987
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 3 | Financial instruments credit-impaired [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   98,355  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 2 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 1,091,109    
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 3 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     1,445
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 3 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 482 12,013  
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 3 to stage 2 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (1,445)
Loans and receivables, category [member] | Gross carrying amount [member] | — From stage 3 to stage 2 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (482) (12,013)  
Loans and receivables, category [member] | Accumulated Impairment [Member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (989,205) (1,251,314) (1,593,846)
New loans originated 1,346,940 373,266 14,948
Transfers 395,436 484,471 775,268
Net impact on expected credit loss by stage transfers 395,436 484,471 775,268
Loans de-recognized and other adjustments in the current period (including repayments of loans) (1,217,786) (412,323) (922,779)
Change in parameters of expected credit loss model 1,916,521 299,479 69,323
Write-offs (847,383) (1,181,312) (279,292)
Recovery of loans written off previously 170,938 174,310  
Ending balance (2,753,871) (989,205) (1,251,314)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   (136,396) (318,987)
New loans originated     14,948
Transfers     (19,116)
Net impact on expected credit loss by stage transfers     (985)
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (214,897)
Change in parameters of expected credit loss model     36,474
Ending balance     (136,396)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (480,854) (136,396)  
New loans originated 1,346,940 373,266  
Transfers (1,104,156) (107,551)  
Net impact on expected credit loss by stage transfers (11,260) (3,066)  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (622,468) (203,494)  
Change in parameters of expected credit loss model 1,759,075 282,237  
Ending balance (1,860,245) (480,854) (136,396)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   (53,258) (111,091)
Transfers     (9,368)
Net impact on expected credit loss by stage transfers     40,224
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (28,844)
Change in parameters of expected credit loss model     (19,621)
Ending balance     (53,258)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (195,339) (53,258)  
Transfers 454,235 213,807  
Net impact on expected credit loss by stage transfers 361,096 164,932  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (470,524) (89,632)  
Change in parameters of expected credit loss model 133,230 17,906  
Ending balance (312,280) (195,339) (53,258)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance   (1,061,660) (1,163,768)
Transfers     803,752
Net impact on expected credit loss by stage transfers     736,029
Loans de-recognized and other adjustments in the current period (including repayments of loans)     (679,038)
Change in parameters of expected credit loss model     52,470
Write-offs     (279,292)
Ending balance     (1,061,660)
Loans and receivables, category [member] | Accumulated Impairment [Member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (313,012) (1,061,660)  
Transfers 1,045,357 378,215  
Net impact on expected credit loss by stage transfers 45,600 322,605  
Loans de-recognized and other adjustments in the current period (including repayments of loans) (124,794) (119,197)  
Change in parameters of expected credit loss model 24,216 (664)  
Write-offs (847,383) (1,181,312)  
Recovery of loans written off previously 170,938 174,310  
Ending balance (581,346) (313,012) (1,061,660)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (4,815)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (1,109,405) (101,324)  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     4,815
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 1,109,405 101,324  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 3 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (14,663)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 3 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   (7,322)  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     14,663
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 1 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   7,322  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     1,347
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Stage 1 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 16,509 4,161  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (1,347)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 1 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (16,509) (4,161)  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 3 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     (54,270)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 3 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers (1,000,215) (49,632)  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     54,270
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 2 to stage 3 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 1,000,215 49,632  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 3 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     1,210
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 3 to stage 2 | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers 458    
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 3 to stage 2 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers     ¥ (1,210)
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 3 to stage 2 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 2 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers   1,344  
Loans and receivables, category [member] | Accumulated Impairment [Member] | — From stage 3 to stage 2 | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Stage 3 [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfers ¥ (458) ¥ (1,344)