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Financial Instruments And Risks- Summary of Liquidity Risk (Detail) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities ¥ 327,529,659 ¥ 184,698,038
Payable to platform investors [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 2,747,891 9,114,906
Borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 26,346,459 10,810,571
Accounts and other payables and contract liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 8,814,255 5,483,757
Payable to investors of consolidated structured entities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 203,200,913 115,363,836
Financing guarantee liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 64,731,369 20,969,026
Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 827,776 1,028,209
Convertible Promissory Note Payable [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 12,594,646 13,014,737
Optionally Convertible Promissory Notes [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 8,266,350 8,912,996
Repayable on demand [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 76,339,143 35,582,636
Repayable on demand [member] | Payable to platform investors [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 2,747,891 9,114,906
Repayable on demand [member] | Accounts and other payables and contract liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 8,814,255 5,483,757
Repayable on demand [member] | Payable to investors of consolidated structured entities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 45,628 14,947
Repayable on demand [member] | Financing guarantee liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 64,731,369 20,969,026
Not later than three months [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 165,816,681 82,639,575
Not later than three months [member] | Borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 16,717,997 2,227,487
Not later than three months [member] | Payable to investors of consolidated structured entities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 148,079,478 79,283,191
Not later than three months [member] | Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 484,497 573,840
Not later than three months [member] | Convertible Promissory Note Payable [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 91,869 101,854
Not later than three months [member] | Optionally Convertible Promissory Notes [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 442,840 453,203
Later than one year and not later than two years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 79,708,552 32,005,390
Later than one year and not later than two years [member] | Borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 9,628,462 120,537
Later than one year and not later than two years [member] | Payable to investors of consolidated structured entities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 49,505,033 31,007,485
Later than one year and not later than two years [member] | Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 248,770 330,146
Later than one year and not later than two years [member] | Convertible Promissory Note Payable [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 12,502,777 94,019
Later than one year and not later than two years [member] | Optionally Convertible Promissory Notes [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 7,823,510 453,203
Later than two years and not later than three years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 5,655,954 34,452,496
Later than two years and not later than three years [member] | Borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities   8,462,547
Later than two years and not later than three years [member] | Payable to investors of consolidated structured entities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 5,570,774 5,058,213
Later than two years and not later than three years [member] | Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 85,180 106,282
Later than two years and not later than three years [member] | Convertible Promissory Note Payable [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities   12,818,864
Later than two years and not later than three years [member] | Optionally Convertible Promissory Notes [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities   8,006,590
Later than three years and not later than four years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities 9,329 17,941
Later than three years and not later than four years [member] | Lease liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Financial liabilities ¥ 9,329 ¥ 17,941