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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   $ 190,743.7 $ 230,048.5
Financing Cash Flow     (34,381.1)
Non-cash changes Foreign Exchange Movement     1,105.5
Non-cash changes Other Changes     (6,029.2)
Ending Balance     190,743.7
IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance $ 194,469.1 210,647.3  
Financing Cash Flow 172,273.2 (6,908.8)  
Non-cash changes Foreign Exchange Movement (3,227.0) (2,105.5)  
Non-cash changes Lease modifications 7,742.2 419.7  
Non-cash changes Other Changes (1,287.2) (7,583.6)  
Ending Balance 369,970.3 194,469.1 210,647.3
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   88,754.7 63,766.8
Financing Cash Flow     23,923.0
Non-cash changes Foreign Exchange Movement     1,064.9
Ending Balance     88,754.7
Short-term loans [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 118,522.3 88,754.7  
Financing Cash Flow (31,571.6) 31,804.3  
Non-cash changes Foreign Exchange Movement 1,608.3 (2,036.7)  
Ending Balance 88,559.0 118,522.3 88,754.7
Guarantee deposits [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   10,189.0 16,080.6
Financing Cash Flow     (279.2)
Non-cash changes Foreign Exchange Movement     423.5
Non-cash changes Other Changes     (6,035.9)
Ending Balance     10,189.0
Guarantee deposits [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 1,729.9 10,189.0  
Financing Cash Flow 129.5 (639.1)  
Non-cash changes Foreign Exchange Movement 1.8 4.5  
Non-cash changes Other Changes (1,511.2) (7,824.5)  
Ending Balance 350.0 1,729.9 10,189.0
Lease Liabilities [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 17,316.9 19,903.6  
Financing Cash Flow (2,819.7) (3,174.0)  
Non-cash changes Foreign Exchange Movement (78.5) (73.3)  
Non-cash changes Lease modifications 7,742.2 419.7  
Non-cash changes Other Changes 227.7 240.9  
Ending Balance 22,388.6 17,316.9 19,903.6
Bonds payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   91,800.0 150,201.1
Financing Cash Flow     (58,024.9)
Non-cash changes Foreign Exchange Movement     (382.9)
Non-cash changes Other Changes     6.7
Ending Balance     91,800.0
Bonds payable [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 56,900.0 91,800.0  
Financing Cash Flow 204,535.0 (34,900.0)  
Non-cash changes Foreign Exchange Movement (4,758.6)    
Non-cash changes Other Changes 28.7    
Ending Balance 256,705.1 $ 56,900.0 $ 91,800.0
Long-term bank loans [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financing Cash Flow 2,000.0    
Non-cash changes Other Changes (32.4)    
Ending Balance $ 1,967.6