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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers Based on Resolution (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
Wafer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 654,478.0 546,955.8
Wafer [member] | 5-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 106,803.0  
Wafer [member] | 7-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 212,348.6 195,936.6
Wafer [member] | 10-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 628.5 2,003.5
Wafer [member] | 16-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 90,649.7 100,128.3
Wafer [member] | 20-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 2,530.8 4,096.4
Wafer [member] | 28-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 74,183.0 76,479.1
Wafer [member] | 40/45-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 46,795.8 52,145.1
Wafer [member] | 65-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 31,958.4 31,561.0
Wafer [member] | 90-nanometer [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 17,755.7 15,300.3
Wafer [member] | 0.11/0.13 micron [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 18,005.1 14,597.9
Wafer [member] | 0.15/0.18 micron [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers 41,607.5 43,279.2
Wafer [member] | 0.25 micron and above [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue from contracts with customers $ 11,211.9 $ 11,428.4