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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers Based on Resolution (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 1,031,473.6
Wafer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	911,296.4
Wafer [member] | 7-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	81,680.7
Wafer [member] | 10-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	96,989.5
Wafer [member] | 16/20-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	210,989.0
Wafer [member] | 28-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	178,440.4
Wafer [member] | 40/45-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	101,801.0
Wafer [member] | 65-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	76,122.3
Wafer [member] | 90-nanometer [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	36,652.1
Wafer [member] | 0.11/0.13 micron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	20,677.7
Wafer [member] | 0.15/0.18 micron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	81,182.6
Wafer [member] | 0.25 micron and above [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 26,761.1

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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. [Refer: Revenue]

+ References

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