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Investments Accounted for Using Equity Method - Investments in Joint Ventures (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Disclosure Of Joint Ventures [Line Items]
Investment in joint venture	$ 9		$ 9
The Company's share of profits (loss)	157	$ 5	253	$ 442
Joint ventures [Member]
Disclosure Of Joint Ventures [Line Items]
The Company's share of profits (loss)	0		0	0
The Company's share of other comprehensive income (loss)	0		0	0
The Company's share of total comprehensive income (loss)	0		0	$ 0
Joint ventures [Member] | Chunghwa SEA Holdings ("CHT SEA") [Member]
Disclosure Of Joint Ventures [Line Items]
Investment in joint venture	$ 9		$ 9
Percentage of ownership in joint venture	51.00%	51.00%	51.00%

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The amount of investments in joint ventures accounted for using the equity method. [Refer: Total for all joint ventures [member]; Investments accounted for using equity method]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

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The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Other comprehensive income]

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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)]

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The entity's share of the total comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Investments accounted for using equity method]

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