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Additional Information of Expenses by Nature - Summary of Profit Sharing Bonus to Employees and Compensation to Directors (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expense by Nature [line items]      
Resolution date of TSMC's Board of Directors in its meeting Feb. 09, 2021 Feb. 11, 2020 Feb. 19, 2019
Bonus to Employees [member]      
Expense by Nature [line items]      
Profit sharing bonus to employees $ 34,753.2 $ 23,165.7 $ 23,570.0
Compensation to Directors [member]      
Expense by Nature [line items]      
Compensation to directors $ 509.8 $ 360.4 $ 349.3