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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Jan. 01, 2020 TWD ($)
Disclosure Of Contract Balance [Abstract]
Trade notes and accounts receivable, net	$ 23,947	$ 863	$ 22,622	$ 26,408
Contract assets
Products and service bundling	7,197		7,232	6,943
Others	983		612	116
Less : Loss allowance	(18)		(18)	(17)
Contract assets	8,162		7,826	7,042
Current Contract Assets	5,554	200	5,331	4,441
Noncurrent Contract Assets	2,608	94	2,495	2,601
Contract liabilities
Telecommunications business	13,144		13,602	12,772
Project business	5,435		6,687	10,360
Products and service bundling	4		16	39
Others	491		421	510
Contract liabilities	19,074		20,726	23,681
Current Contract Liabilities	12,234	441	13,437	16,840
Noncurrent Contract Liabilities	6,840	$ 247	7,289	6,841
Contract liabilities	$ 19,074		$ 20,726	$ 23,681

X

- 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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- Definition

Others.

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X

- Definition

Products and service bundling.

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Product and service bundling of contracts liabilities.

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- Definition

Project business.

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- Definition

Telecommunications business.

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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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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