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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Short-term loans $ 88,559.0 $ 3,153.8 $ 118,522.3
Accrued expenses and other current liabilities 87,683.2 3,122.6 56,373.2
Long-term bank loans 1,967.6 $ 70.1  
Total non-derivative and derivative financial instruments 682,091.8   424,402.4
Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 88,557.5   118,562.6
Accounts payable (including related parties) 41,095.0   40,206.0
Payables to contractors and equipment suppliers 157,805.0   140,810.7
Accrued expenses and other current liabilities 71,995.7   45,760.9
Bonds payable 300,098.5   58,320.2
Long-term bank loans 2,026.3    
Lease liabilities (including those classified under accrued expenses and other current liabilities) 23,857.6   18,690.2
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 350.0   1,729.9
Non-derivative financial liabilities 685,785.6   424,080.5
Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 177,764.2   141,450.8
Inflows (181,458.0)   (141,128.9)
Derivative financial instruments (3,693.8)   321.9
Less than 1 year [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 363,204.0   382,029.1
Less than 1 year [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 88,557.5   118,562.6
Accounts payable (including related parties) 41,095.0   40,206.0
Payables to contractors and equipment suppliers 157,805.0   140,810.7
Accrued expenses and other current liabilities 71,995.7   45,760.9
Bonds payable 5,328.0   32,338.9
Long-term bank loans 8.0    
Lease liabilities (including those classified under accrued expenses and other current liabilities) 2,024.2   2,475.1
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 84.4   1,553.0
Non-derivative financial liabilities 366,897.8   381,707.2
Less than 1 year [member] | Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 177,764.2   141,450.8
Inflows (181,458.0)   (141,128.9)
Derivative financial instruments (3,693.8)   321.9
1-3 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 32,159.2   10,681.6
1-3 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 27,631.6   7,777.7
Long-term bank loans 847.4    
Lease liabilities (including those classified under accrued expenses and other current liabilities) 3,566.7   2,782.9
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 113.5   121.0
Non-derivative financial liabilities 32,159.2   10,681.6
3-5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 64,508.3   20,743.6
3-5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 59,986.8   18,203.6
Long-term bank loans 1,170.9    
Lease liabilities (including those classified under accrued expenses and other current liabilities) 3,198.8   2,484.5
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 151.8   55.5
Non-derivative financial liabilities 64,508.3   20,743.6
More than 5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 222,220.3   10,948.1
More than 5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 207,152.1    
Lease liabilities (including those classified under accrued expenses and other current liabilities) 15,067.9   10,947.7
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 0.3   0.4
Non-derivative financial liabilities $ 222,220.3   $ 10,948.1