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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Short-term loans $ 114,921.3 $ 4,142.8 $ 88,559.0
Accrued expenses and other current liabilities 162,267.8 5,849.7 87,683.2
Long-term bank loans 3,309.1 $ 119.3 1,967.6
Total non-derivative and derivative financial instruments 1,376,742.5   681,741.8
Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 114,767.0   88,557.5
Accounts payable (including related parties) 48,722.8   41,095.0
Payables to contractors and equipment suppliers 145,742.2   157,805.0
Accrued expenses and other current liabilities 120,240.4   71,995.7
Bonds payable 754,345.1   300,098.5
Long-term bank loans 3,554.7   2,026.3
Lease liabilities (including those classified under accrued expenses and other current liabilities) 24,302.3   23,857.6
Others 164,991.9    
Non-derivative financial liabilities 1,376,666.4   685,435.6
Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 187,708.0   177,764.2
Inflows (187,631.9)   (181,458.0)
Derivative financial instruments 76.1   (3,693.8)
Less than 1 year [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 445,684.4   363,119.6
Less than 1 year [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 114,767.0   88,557.5
Accounts payable (including related parties) 48,722.8   41,095.0
Payables to contractors and equipment suppliers 145,742.2   157,805.0
Accrued expenses and other current liabilities 120,240.4   71,995.7
Bonds payable 13,580.6   5,328.0
Long-term bank loans 183.7   8.0
Lease liabilities (including those classified under accrued expenses and other current liabilities) 2,371.6   2,024.2
Non-derivative financial liabilities 445,608.3   366,813.4
Less than 1 year [member] | Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 187,708.0   177,764.2
Inflows (187,631.9)   (181,458.0)
Derivative financial instruments 76.1   (3,693.8)
1-3 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 213,906.6   32,045.7
1-3 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 42,801.4   27,631.6
Long-term bank loans 2,217.1   847.4
Lease liabilities (including those classified under accrued expenses and other current liabilities) 3,896.2   3,566.7
Others 164,991.9    
Non-derivative financial liabilities 213,906.6   32,045.7
3-5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 195,997.3   64,356.5
3-5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 191,458.1   59,986.8
Long-term bank loans 1,153.9   1,170.9
Lease liabilities (including those classified under accrued expenses and other current liabilities) 3,385.3   3,198.8
Non-derivative financial liabilities 195,997.3   64,356.5
More than 5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 521,154.2   222,220.0
More than 5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 506,505.0   207,152.1
Lease liabilities (including those classified under accrued expenses and other current liabilities) 14,649.2   15,067.9
Non-derivative financial liabilities $ 521,154.2   $ 222,220.0