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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2024 USD ($)
Disclosure of financial assets [line items]
Corporate bonds	$ 190,567.8	$ 145,960.6
Current portion	101,971.3	66,761.2	$ 3,109.8
Noncurrent portion	88,596.5	79,199.4	$ 2,701.9
Corporate bonds [member]
Disclosure of financial assets [line items]
Corporate bonds	172,092.0	113,851.9
Less: Allowance for impairment loss	(125.4)	(82.7)
Commercial paper [member]
Disclosure of financial assets [line items]
Debt instruments held	14,221.7	18,387.9
Government bonds/Agency bonds [member]
Disclosure of financial assets [line items]
Debt instruments held	$ 4,379.5	$ 13,803.5

X

- Definition

Adjustments for impairment losses (reversal of impairment losses) on financial assets recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of debt instruments, including instruments called debt securities, held by the entity that were issued by a corporate entity. [Refer: Debt instruments held]

+ References

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- Definition

The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

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The amount of instruments representing indebtedness, including instruments called debt securities, held by the entity.

+ References

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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.

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- Definition

The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

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