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Contents of Significant Accounts - Long-Term Loans - Additional Information (Detail) - TWD ($) $ in Millions | Apr. 25, 2023 | Apr. 14, 2022 | Dec. 24, 2021 | Mar. 03, 2021 | Dec. 31, 2023 | Dec. 31, 2022
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Secured syndicated loans from China development bank [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Endorsement |  |  |  |  | $ 9,946 | $ 7,878
Secured syndicated loans from China development bank [member] | HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Endorsement |  |  |  |  | 1,686 | 2,407
Secured syndicated loans from China development bank [member] | Top of range [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Endorsement |  |  |  |  | 10,351 | 17,876
Secured syndicated loans from China development bank [member] | Top of range [member] | HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HJ) [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Endorsement |  |  |  |  | 2,934 | 7,547
Yuanta Commercial Bank [Member] | Unsecured Revolving Loan [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt maturity period |  |  |  | 5-year |  |
Debt maximum borrowing capacity |  |  |  | $ 4,000 |  |
Unused line of credit |  |  |  |  | 0 | 4,000
CTBC Bank [Member] | Unsecured Revolving Loan [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt maturity period |  |  | 5-year |  |  |
Debt maximum borrowing capacity |  |  | $ 4,000 |  |  |
Unused line of credit |  |  |  |  | 0 | 4,000
First Commercial Bank [Member] | Unsecured Revolving Loan [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt maturity period | 1-year | 1-year |  |  |  |
Debt maximum borrowing capacity | $ 2,000 | $ 2,000 |  |  |  |
Unused line of credit |  |  |  |  | $ 1,200 | $ 1,200

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