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Fair Value Measurement - Summary of Activities Related to Fair Value of the Guarantee Derivatives (Details) - Guarantee Derivative Assets or Liabilities - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Fair value of guarantee derivative liabilities/(assets) at beginning of the year (Level 3) ¥ 1,473,853 ¥ 252,613 ¥ (280,998)
Cash collection 4,436,911 3,107,316 1,107,646
Net cash payout (4,435,587) (2,344,922) (1,281,477)
Change in fair value ¥ (613,873) 458,846 707,442
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)    
Fair value of guarantee derivative liabilities/(assets) at end of the year (Level 3) ¥ 861,304 ¥ 1,473,853 ¥ 252,613