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Bonds Payable - Summary of Major Terms of Unsecured Domestic Bonds Issued (Detail) - TWD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Detailed Information About Bonds Payable [Line Items] |  |  |  |  |
Total Amount |  |  |  | $ 30,500 | $ 30,500
Unsecured Domestic Bonds [Member] |  |  |  |  |
Disclosure Of Detailed Information About Bonds Payable [Line Items] |  |  |  |  |
Issuance Period | March 2022 to March 2027 |  |  |  |
Total Amount | $ 3,500 |  |  |  |
Interest rates of loans | 0.69% |  |  |  |
Repayment and Interest Payment | The same as above |  |  |  |
Unsecured Domestic Bonds [Member] | Tranche A [Member] |  |  |  |  |
Disclosure Of Detailed Information About Bonds Payable [Line Items] |  |  |  |  |
Issuance Period |  | April 2021 to April 2026 | July 2020 to July 2025 |  |
Total Amount |  | $ 1,900 | $ 8,800 |  |
Interest rates of loans |  | 0.42% | 0.50% |  |
Repayment and Interest Payment |  | The same as above | One-time repayment upon maturity; interest payable annually |  |
Unsecured Domestic Bonds [Member] | Tranche B [Member] |  |  |  |  |
Disclosure Of Detailed Information About Bonds Payable [Line Items] |  |  |  |  |
Issuance Period |  | April 2021 to April 2028 | July 2020 to July 2027 |  |
Total Amount |  | $ 4,100 | $ 7,500 |  |
Interest rates of loans |  | 0.46% | 0.54% |  |
Repayment and Interest Payment |  | The same as above | The same as above |  |
Unsecured Domestic Bonds [Member] | Tranche C [Member] |  |  |  |  |
Disclosure Of Detailed Information About Bonds Payable [Line Items] |  |  |  |  |
Issuance Period |  | April 2021 to April 2031 | July 2020 to July 2030 |  |
Total Amount |  | $ 1,000 | $ 3,700 |  |
Interest rates of loans |  | 0.50% | 0.59% |  |
Repayment and Interest Payment |  | The same as above | The same as above |  |

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