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History And Reorganization of The Group - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Millions
 3 Months Ended
Oct. 30, 2020
CNY (¥)
shares
Oct. 30, 2020
USD ($)
$ / shares
shares
Nov. 30, 2019
CNY (¥)
Jan. 31, 2019
CNY (¥)
shares
Jan. 31, 2019
USD ($)
$ / shares
shares
Nov. 29, 2018
CNY (¥)
shares
Nov. 29, 2018
USD ($)
$ / shares
shares
Sep. 30, 2020
CNY (¥)
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
History and reorganisation of the group [line items]                          
Promissory notes issued | ¥                   ¥ 10,669,498   ¥ 10,117,188  
Common stock shares outstanding                       1,231,150,560  
Promissory notes issued rate of interest                   125.00% 125.00%    
Common stock shares issued                       1,231,150,560  
Stock repurchase program, Number of shares authorized, Value | $                     $ 1,000    
Stock repurchase program, Number of shares repurchased                   107,000,000 107,000,000 54,000,000  
Stock repurchase program, Number of shares repurchased, Value                   ¥ 5,560,000 $ 864    
Tun Kung Company Limited [member]                          
History and reorganisation of the group [line items]                          
Common stock shares issued                       35,644,803  
Share pledge agreement [member]                          
History and reorganisation of the group [line items]                          
Percentage of equity interest pledged                   100.00% 100.00% 100.00% 100.00%
OPCO [member]                          
History and reorganisation of the group [line items]                          
Percentage of legal beneficial interest owned by each onshore shareholder                   100.00% 100.00% 100.00% 100.00%
Promissory notes and automatically convertible promissory notes [member]                          
History and reorganisation of the group [line items]                          
Increase (decrease) in equity shares outstanding due to conversion of convertible instruments 7,566,665 7,566,665                      
Initial public offer [member]                          
History and reorganisation of the group [line items]                          
Sale of stock issue price per share | $ / shares   $ 27.00                      
Proceeds from issue of common stock ¥ 17,305,000 $ 2,581                      
Over allotment [member]                          
History and reorganisation of the group [line items]                          
Proceeds from issue of common stock | $   $ 314                      
Class C ordinary share [member] | Promissory notes and automatically convertible promissory notes [member]                          
History and reorganisation of the group [line items]                          
Promissory notes issued | ¥               ¥ 1,362,000          
Common stock shares outstanding               45,287,111          
Promissory notes convertible into equivalent number of shares               38,493,660          
Promissory notes issued rate of interest               6.00%          
Gain loss due to change in the fair value of promissory notes               ¥ (1,326,000) $ (195)        
Class C ordinary share [member] | Series C round investment [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares       2,693,435 2,693,435 44,256,290 44,256,290            
Sale of stock issue price per share | $ / shares         $ 30.07   $ 30.07            
Proceeds from issue of common stock       ¥ 542,000 $ 81 ¥ 9,230,000 $ 1,331            
American depositary shares [member]                          
History and reorganisation of the group [line items]                          
Sale of stock issue price per share | $ / shares   $ 13.5                      
American depositary shares [member] | Initial public offer [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares 199,155,128 199,155,128                      
Sale of stock issue price per share | $ / shares   $ 13.50                      
American depositary shares [member] | Over allotment [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares 24,155,128 24,155,128                      
Class B and class C ordinary shares convertible into class A ordinary shares [member]                          
History and reorganisation of the group [line items]                          
Common stock shares converted from one class to another   136,859,460                      
Ordinary shares [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares 99,577,564 99,577,564                      
Stock repurchase program, Number of shares repurchased                   54,000,000 54,000,000    
Ordinary shares [member] | Initial public offer [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares 87,500,000 87,500,000                      
Ordinary shares [member] | Over allotment [member]                          
History and reorganisation of the group [line items]                          
Stock shares issued during the period shares 12,077,564 12,077,564                      
Ping an consumer finance [member]                          
History and reorganisation of the group [line items]                          
Investment in subsidaries | ¥     ¥ 3,500,000                    
Proportion of ownership interest in subsidary     70.00%                    
Ping an consumer finance [member] | Ping an group [member]                          
History and reorganisation of the group [line items]                          
Investment in subsidaries | ¥     ¥ 1,500,000                    
Proportion of ownership interest in subsidary     30.00%