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Related Party Transactions - Summary of Detailed Information About Additional Information of Transactions With Related Parties (Parenthetical) (Detail)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2022
HKD ($)
Jun. 30, 2022
HKD ($)
Dec. 31, 2022
HKD ($)
Dec. 31, 2021
HKD ($)
Dec. 31, 2020
HKD ($)
Dec. 31, 2022
USD ($)
Disclosure of transactions between related parties [line items]            
Settlements, fair value measurement, assets       $ 119,113,730 $ 82,948,667  
Consideration Paid           $ 993
Receivables Due From Immediate Holding Company     $ 2,239,358,702 2,144,975,230    
Receivables Due From Fellow Subsidiaries     0      
Provision For Credit Losses On Amounts Receivable Due From Immediate Holding Company     $ 0 $ 0 $ 0  
AMTD Digital [Member]            
Disclosure of transactions between related parties [line items]            
Percentage of acquisition of ordinary shares     82.70%     82.70%
AMTD Digital Inc [Member]            
Disclosure of transactions between related parties [line items]            
Percentage of ownership interest in subsidiary         14.37%  
AMTD Assets Alpha Group [Member]            
Disclosure of transactions between related parties [line items]            
Percentage of ownership interest in subsidiary       19.90%    
Fellow Subsidiaries [Member]            
Disclosure of transactions between related parties [line items]            
Settlements, fair value measurement, assets     $ 5,998,446 $ 5,998,446    
Immediate holding company [Member]            
Disclosure of transactions between related parties [line items]            
Fixed Service Fee Expense $ 9,000,000 $ 6,000,000        
Percentage Of Interest Income Charged On Outstanding Amount Due     2.00%