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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)
Disclosure Of Contract Balance [Abstract]
Trade notes and accounts receivable, net	$ 30,076	$ 983	$ 31,941
Contract assets
Products and service bundling	7,123
Other	109
Less : Loss allowance	(19)
Contract assets	7,213
Contract assets	4,869	159	0
Contract assets	2,344	77	0
Contract liabilities
Telecommunications business	8,193
Project business	4,508
Products and service bundling	106
Other	476
Contract liabilities	13,283
Current Contract Liabilities	10,688	349	0
Noncurrent Contract Liabilities	2,595	$ 85	$ 0
Contract liabilities	$ 13,283

X

- Definition

Allowance for loss on contract assets.

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- Definition

Disclosure of contract balance.

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- Definition

Others.

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- Definition

Others.

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No definition available.

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- 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

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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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