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Share-based Payment - Additional Information (Detail) - shares
 12 Months Ended
Jan. 06, 2005
Oct. 29, 2003
Jun. 25, 2002
Dec. 31, 2017
Disclosure Of Share Based Compensation Expense [line items]        
Maximum term of options granted       10 years
Stock Options Granted Threshold [member] | Bottom of range [member]        
Disclosure Of Share Based Compensation Expense [line items]        
Voting rights percentage       50.00%
TSMC 2002 Plan [member]        
Disclosure Of Share Based Compensation Expense [line items]        
Stock option authorized to be granted     100,000,000  
TSMC 2003 Plan [member]        
Disclosure Of Share Based Compensation Expense [line items]        
Stock option authorized to be granted   120,000,000    
TSMC 2004 Plan [member]        
Disclosure Of Share Based Compensation Expense [line items]        
Stock option authorized to be granted 11,000,000