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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% |  |  |

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