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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 1,587,415.0 $ 1,339,254.8 $ 1,069,985.4
Wafer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,405,300.3 1,178,456.3 927,317.3
Wafer [member] | 5-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 262,327.4 90,934.5 0.0
Wafer [member] | 7-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 440,383.1 394,837.0 249,548.1
Wafer [member] | 10-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 660.0 3,403.1 23,266.4
Wafer [member] | 16-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 191,058.9 197,959.0 186,700.9
Wafer [member] | 20-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 5,668.8 8,450.9 9,535.8
Wafer [member] | 28-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 153,066.6 149,367.7 149,578.7
Wafer [member] | 40/45-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 103,413.6 103,176.5 93,366.3
Wafer [member] | 65-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 66,467.9 61,226.7 69,250.0
Wafer [member] | 90-nanometer [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 32,260.3 29,380.4 25,624.2
Wafer [member] | 0.11/0.13 micron [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 40,558.5 33,197.1 22,947.3
Wafer [member] | 0.15/0.18 micron [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 86,700.3 86,008.5 77,564.5
Wafer [member] | 0.25 micron and above [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 22,734.9 $ 20,514.9 $ 19,935.1