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Financial Instruments - Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments, Including Principal and Interest (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Short-term loans $ 118,522.3 $ 3,962.6 $ 88,754.7
Accrued expenses and other current liabilities 56,373.2 $ 1,884.8 61,760.6
Total non-derivative and derivative financial instruments 424,402.4   321,000.5
Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 118,562.6   88,810.7
Accounts payable (including related parties) 40,206.0   34,357.4
Payables to contractors and equipment suppliers 140,810.7   43,133.7
Accrued expenses and other current liabilities 45,760.9   50,241.0
Bonds payable 58,320.2   94,360.1
Lease liabilities (including those classified under accrued expenses and other current liabilities) 18,690.2    
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 1,729.9   10,189.0
Non-derivative financial liabilities 424,080.5   321,091.9
Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 141,450.8   49,302.3
Inflows (141,128.9)   (49,393.7)
Derivative financial instruments 321.9   (91.4)
Less than 1 year [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 382,029.1   259,327.0
Less than 1 year [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 118,562.6   88,810.7
Accounts payable (including related parties) 40,206.0   34,357.4
Payables to contractors and equipment suppliers 140,810.7   43,133.7
Accrued expenses and other current liabilities 45,760.9   50,241.0
Bonds payable 32,338.9   36,039.9
Lease liabilities (including those classified under accrued expenses and other current liabilities) 2,475.1    
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 1,553.0   6,835.7
Non-derivative financial liabilities 381,707.2   259,418.4
Less than 1 year [member] | Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 141,450.8   49,302.3
Inflows (141,128.9)   (49,393.7)
Derivative financial instruments 321.9   (91.4)
1-3 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 10,681.6   38,232.4
1-3 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 7,777.7   35,340.8
Lease liabilities (including those classified under accrued expenses and other current liabilities) 2,782.9    
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 121.0   2,891.6
Non-derivative financial liabilities 10,681.6   38,232.4
3-5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 20,743.6   23,441.1
3-5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 18,203.6   22,979.4
Lease liabilities (including those classified under accrued expenses and other current liabilities) 2,484.5    
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 55.5   461.7
Non-derivative financial liabilities 20,743.6   $ 23,441.1
More than 5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 10,948.1    
More than 5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Lease liabilities (including those classified under accrued expenses and other current liabilities) 10,947.7    
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 0.4    
Non-derivative financial liabilities $ 10,948.1