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Bonds Payable - Summary of Domestic Unsecured Bonds And Overseas Unsecured Bonds (Detail) - TWD ($) $ in Millions | 4 Months Ended | 12 Months Ended
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Apr. 20, 2023 | Dec. 31, 2022
Disclosure of detailed information about borrowings [line items] |  |
Repayment and Interest Payment |  | Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Domestic Unsecured Bonds Hundred And Twelve One Green Bond [Member] | Tranche A [member] | Taiwan [member] | Non Adjusting Events After Reporting Period [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance starting period | 2023-03 |
Issuance ending period | 2028-03 |
Domestic unsecured bonds | $ 12,200.0 |
Coupon Rate | 1.54% |
Repayment and Interest Payment | Bullet repayment; interest payable annually |
Domestic Unsecured Bonds Hundred And Twelve One Green Bond [Member] | Tranche B [member] | Taiwan [member] | Non Adjusting Events After Reporting Period [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance starting period | 2023-03 |
Issuance ending period | 2030-03 |
Domestic unsecured bonds | $ 2,300.0 |
Coupon Rate | 1.60% |
Repayment and Interest Payment | Bullet repayment; interest payable annually |
Domestic Unsecured Bonds Hundred And Twelve One Green Bond [Member] | Tranche C [member] | Taiwan [member] | Non Adjusting Events After Reporting Period [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance starting period | 2023-03 |
Issuance ending period | 2033-03 |
Domestic unsecured bonds | $ 4,800.0 |
Coupon Rate | 1.78% |
Repayment and Interest Payment | Bullet repayment; interest payable annually |

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