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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers by Geographical Location (Detail) - TWD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 734,555.4	$ 621,295.5
Taiwan [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	99,480.7	57,932.9
United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	456,177.7	349,676.1
China [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	78,239.4	133,559.6
Europe Middle East and Africa [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	45,022.3	34,532.7
Japan [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	34,380.7	33,966.4
Other country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 21,254.6	$ 11,627.8

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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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