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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers by Geographical Location (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 1,339,254.8	$ 1,069,985.4	$ 1,031,473.6
Taiwan [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	129,082.9	84,255.2	78,260.8
United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	817,911.0	634,713.0	632,821.5
China [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	233,783.3	208,101.4	175,794.2
Europe Middle East and Africa [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	70,213.4	67,568.2	71,068.5
Japan [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	63,299.2	57,468.6	58,125.9
Other country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 24,965.0	$ 17,879.0	$ 15,402.7

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

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