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Hedging Financial Instruments - Summary of Information Related to Hedges of Interest Rate Risk (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 39.9 | $ 1.3 | $ 0.0 | $ (41.4) |  |
Fair value hedges [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 0.0 |  |  |  |  |
US treasury bonds interest rate futures contracts [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Contract Amount |  |  |  |  | $ 48.6 | $ 74.3
Maturity | March 2024 | March 2024 | March 2023 |  |  |
US treasury bonds interest rate futures contracts [member] | Fair value hedges [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 20.5 |  | $ 284.0 | 148.8 |  |
FVTOCI [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Asset Carrying Amount | 3,959.5 |  | 4,008.2 |  |  |
Asset Accumulated Amount of Fair Value Hedge Adjustments | 43.8 |  | (1.5) |  |  |
FVTOCI [member] | Fair value hedges [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ (20.5) |  | $ (284.0) | $ (148.8) |  |

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Hedging instruments contract amount maturity date. + References No definition available. + Details
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