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Financial Instruments And Risks - Summary of Credit Risk Exposure Of The Financial Instruments Under The Scope of Expected Credit Loss (Detail) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables ¥ 218,756,723 ¥ 126,389,783
Stage One [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 216,363,013 124,595,435
Stage Two [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 1,263,965 644,478
Stage Three [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 627,723 1,068,495
Purchased or originated creditimpaired financial assets [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 502,022 81,375
On Balance Sheet Exposure [Member] | Financial assets at amortised cost, class [member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 3,784,613 6,563,969
On Balance Sheet Exposure [Member] | Financial assets at amortised cost, class [member] | Stage One [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 2,697,852 5,507,707
On Balance Sheet Exposure [Member] | Financial assets at amortised cost, class [member] | Stage Three [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 584,739 974,887
On Balance Sheet Exposure [Member] | Financial assets at amortised cost, class [member] | Purchased or originated creditimpaired financial assets [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 502,022 81,375
On Balance Sheet Exposure [Member] | Loans to consumers [member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 214,972,110 119,825,814
On Balance Sheet Exposure [Member] | Loans to consumers [member] | Stage One [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 213,665,161 119,087,728
On Balance Sheet Exposure [Member] | Loans to consumers [member] | Stage Two [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 1,263,965 644,478
On Balance Sheet Exposure [Member] | Loans to consumers [member] | Stage Three [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Maximum exposure to credit risk of loans or receivables 42,984 93,608
Off Balance Sheet Exposure [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Financing guarantee contracts 64,731,369 20,969,026
Off Balance Sheet Exposure [Member] | Financial guarantee contracts [member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Financing guarantee contracts 64,731,369 20,969,026
Off Balance Sheet Exposure [Member] | Financial guarantee contracts [member] | Stage One [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Financing guarantee contracts 64,416,918 20,898,499
Off Balance Sheet Exposure [Member] | Financial guarantee contracts [member] | Stage Two [Member]    
Disclosure Details Of Maximum Credit Risk Exposure Before Collateral Received [Line Items]    
Financing guarantee contracts ¥ 314,451 ¥ 70,527