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Fair Value Information - Financial Instruments Measured at Fair Value on a Recurring Basis (Detail) $ in Millions, $ in Millions | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Hedging financial liabilities | $ 2 | $ 0 | $ 0
Fair value on a recurring basis [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 1,005 |  | 1,037
Hedging financial assets | 1 |  |
Financial assets at FVOCI | 4,667 |  | 4,412
Hedging financial liabilities | 2 |  | 0
Fair value on a recurring basis [Member] | Derivatives [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 1
Fair value on a recurring basis [Member] | Listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL |  |  | 0
Fair value on a recurring basis [Member] | Listed and Emerging Stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVOCI | 126 |  | 243
Fair value on a recurring basis [Member] | Non-listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 661 |  | 793
Financial assets at FVOCI | 4,541 |  | 4,169
Fair value on a recurring basis [Member] | Limited Partnership [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 307 |  | 219
Fair value on a recurring basis [Member] | Other Investing Agreements [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 37 |  | 24
Fair value on a recurring basis [Member] | Level 1 [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Hedging financial assets | 0 |  |
Financial assets at FVOCI | 126 |  | 243
Hedging financial liabilities | 0 |  | 0
Fair value on a recurring basis [Member] | Level 1 [Member] | Derivatives [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 1 [Member] | Listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL |  |  | 0
Fair value on a recurring basis [Member] | Level 1 [Member] | Listed and Emerging Stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVOCI | 126 |  | 243
Fair value on a recurring basis [Member] | Level 1 [Member] | Non-listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Financial assets at FVOCI | 0 |  | 0
Fair value on a recurring basis [Member] | Level 1 [Member] | Limited Partnership [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 1 [Member] | Other Investing Agreements [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 1
Hedging financial assets | 1 |  |
Financial assets at FVOCI | 0 |  | 0
Hedging financial liabilities | 2 |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] | Derivatives [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 1
Fair value on a recurring basis [Member] | Level 2 [Member] | Listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL |  |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] | Listed and Emerging Stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVOCI | 0 |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] | Non-listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Financial assets at FVOCI | 0 |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] | Limited Partnership [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 2 [Member] | Other Investing Agreements [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 3 [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 1,005 |  | 1,036
Hedging financial assets | 0 |  |
Financial assets at FVOCI | 4,541 |  | 4,169
Hedging financial liabilities | 0 |  | 0
Fair value on a recurring basis [Member] | Level 3 [Member] | Derivatives [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 0 |  | 0
Fair value on a recurring basis [Member] | Level 3 [Member] | Listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL |  |  | 0
Fair value on a recurring basis [Member] | Level 3 [Member] | Listed and Emerging Stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVOCI | 0 |  | 0
Fair value on a recurring basis [Member] | Level 3 [Member] | Non-listed stocks [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 661 |  | 793
Financial assets at FVOCI | 4,541 |  | 4,169
Fair value on a recurring basis [Member] | Level 3 [Member] | Limited Partnership [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | 307 |  | 219
Fair value on a recurring basis [Member] | Level 3 [Member] | Other Investing Agreements [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Financial assets at FVTPL | $ 37 |  | $ 24

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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 11A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_h&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_a&doctype=Standard -URIDate 2024-03-27 + Details
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