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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - IFRS 16 [Member] - TWD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning Balance $ 369,620.3 $ 192,739.2
Financing Cash Flow 210,682.7 95,827.9
Non-cash changes Foreign Exchange Movement (5,783.2) (1,583.4)
Non-cash changes Lease modifications 1,521.4 5,307.8
Non-cash changes Other Changes (132.4) 138.3
Ending Balance 575,908.8 292,429.8
Short-term loans [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning Balance 88,559.0 118,522.3
Financing Cash Flow 55,624.1 52,578.6
Non-cash changes Foreign Exchange Movement (4,518.5) (1,553.9)
Non-cash changes Other Changes (283.7)  
Ending Balance 139,380.9 169,547.0
Lease Liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning Balance 22,388.6 17,316.9
Financing Cash Flow (1,082.1) (1,573.9)
Non-cash changes Foreign Exchange Movement (33.2) (29.5)
Non-cash changes Lease modifications 1,521.4 5,307.8
Non-cash changes Other Changes 97.0 128.4
Ending Balance 22,891.7 21,149.7
Bonds payable [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning Balance 256,705.1 56,900.0
Financing Cash Flow 154,930.7 38,337.9
Non-cash changes Foreign Exchange Movement (1,231.5)  
Non-cash changes Other Changes 60.6 1.8
Ending Balance 410,464.9 95,239.7
Long-term bank loans [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning Balance 1,967.6  
Financing Cash Flow 1,210.0  
Non-cash changes Other Changes (6.3)  
Ending Balance $ 3,171.3  
Short term bills payable [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Financing Cash Flow   6,485.3
Non-cash changes Other Changes   8.1
Ending Balance   $ 6,493.4