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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Disclosure Of Contract Balance [Abstract]
Trade notes and accounts receivable, net	$ 26,026	$ 794	$ 24,842	$ 24,672
Contract assets
Products and service bundling	10,446		9,297	7,956
Others	2,306		1,206	1,256
Less : Loss allowance	(24)		(21)	(19)
Contract assets	12,728		10,482	9,193
Current Contract Assets	8,401	256	6,713	6,056
Noncurrent Contract Assets	4,327	132	3,769	3,137
Contract liabilities
Telecommunications business	13,931		14,016	14,081
Project business	8,015		6,654	6,586
Advance house and land receipts	1,064		460	0
Others	832		518	397
Contract liabilities	23,842		21,648	21,064
Current Contract Liabilities	16,301	497	14,088	13,390
Noncurrent Contract Liabilities	7,541	$ 230	7,560	7,674
Contract liabilities	$ 23,842		$ 21,648	$ 21,064

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- Definition

Advance land receipts of contract liabilities.

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- Definition

Allowance for loss on contract assets.

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Disclosure of contract balance.

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- Definition

Others.

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No definition available.

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- Definition

Others.

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- Definition

Products and service bundling.

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- Definition

Project business.

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- Definition

Telecommunications business.

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- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

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- Definition

The amount of current contract assets. [Refer: Contract assets]

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The amount of current contract liabilities. [Refer: Contract liabilities]

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- Definition

The amount of current trade receivables. [Refer: Trade receivables]

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The amount of non-current contract assets. [Refer: Contract assets]

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The amount of non-current contract liabilities. [Refer: Contract liabilities]

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