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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers Based on Resolution (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
Wafer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,178,456.3 927,317.3 911,296.4
Wafer [member] | 5-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 90,934.5    
Wafer [member] | 7-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 394,837.0 249,548.1 81,680.7
Wafer [member] | 10-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 3,403.1 23,266.4 96,989.5
Wafer [member] | 16-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 197,959.0 186,700.9 187,370.6
Wafer [member] | 20-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 8,450.9 9,535.8 23,618.4
Wafer [member] | 28-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 149,367.7 149,578.7 178,440.4
Wafer [member] | 40/45-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 103,176.5 93,366.3 101,801.0
Wafer [member] | 65-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 61,226.7 69,250.0 76,122.3
Wafer [member] | 90-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 29,380.4 25,624.2 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 33,197.1 22,947.3 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 86,008.5 77,564.5 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 $ 20,514.9 $ 19,935.1 $ 26,761.1