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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 ($)
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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The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of derivative financial liabilities held for hedging. [Refer: Derivative financial liabilities]

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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]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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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]

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