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Derivative Financial Assets - Additional information (Detail)
12 Months Ended
Jul. 01, 2019
$ / shares
Apr. 01, 2019
$ / shares
Dec. 31, 2022
HKD ($)
Dec. 31, 2022
$ / shares
Dec. 31, 2022
HKD ($)
shares
Dec. 31, 2021
HKD ($)
Jun. 26, 2020
$ / shares
shares
Disclosure of detailed information about financial instruments [line items]              
Market value of derivative contracts pledged | $         $ 3,781,638,616 $ 3,089,570,978  
Underlying listed shares              
Disclosure of detailed information about financial instruments [line items]              
Number of shares of investment, disposed | shares         2,673,000   176,766,469
Number of consideration received from the disposal of investment | shares         15,306,985   618,682,641
Sale of stock per share | $ / shares       $ 3.27     $ 5.5
Bottom of range [member]              
Disclosure of detailed information about financial instruments [line items]              
Percentage of profit eligible based on market price 25.00%            
Top of range [member]              
Disclosure of detailed information about financial instruments [line items]              
Percentage of profit eligible based on market price 40.00%            
AMTD Investment Solutions Group And AMTD Strategic Investments [Member]              
Disclosure of detailed information about financial instruments [line items]              
Number of shares of investment, disposed | shares         2,673,000   176,766,469
Upside Participation And Profit Distribution Amendment Agreement One [Member] | AMTD Investment Solutions Group And AMTD Strategic Investments [Member] | Ariana Capital And Investment [Member]              
Disclosure of detailed information about financial instruments [line items]              
Percentage of profit eligible based on market price   25.00%          
Upside Participation And Profit Distribution Amendment Agreement Two [Member] | Bottom of range [member]              
Disclosure of detailed information about financial instruments [line items]              
Underlying, derivative instrument | $ / shares $ 8.1            
Upside Participation And Profit Distribution Amendment Agreement Two [Member] | Top of range [member]              
Disclosure of detailed information about financial instruments [line items]              
Underlying, derivative instrument | $ / shares $ 9            
Upside Participation And Profit Distribution Amendment Agreement Two [Member] | AMTD Investment Solutions Group And AMTD Strategic Investments [Member] | Ariana Capital And Investment [Member]              
Disclosure of detailed information about financial instruments [line items]              
Underlying, derivative instrument | $ / shares   $ 8.1          
Future Settlement Contract [member]              
Disclosure of detailed information about financial instruments [line items]              
Fair value of underlying shares | $         $ 553,279,047    
Shares entitled to be received at a mutually agreed price as per future settlement contract derivative | $         $ 415,401,202    
Gain or loss on derivative financial assets at fair value through profit or loss | $     $ 137,877,845