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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance $ 190,743.7 $ 230,048.5 $ 275,822.4
Financing Cash Flow   (34,381.1) (30,578.0)
Non-cash changes Foreign Exchange Movement   1,105.5 (9,113.6)
Non-cash changes Other Changes   (6,029.2) (6,082.3)
Ending Balance   190,743.7 230,048.5
IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 210,647.3    
Financing Cash Flow (6,908.8)    
Non-cash changes Foreign Exchange Movement (2,105.5)    
Non-cash changes Lease modifications 419.7    
Non-cash changes Other Changes (7,583.6)    
Ending Balance 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 57,958.2
Financing Cash Flow   23,923.0 10,394.3
Non-cash changes Foreign Exchange Movement   1,064.9 (4,585.7)
Ending Balance   88,754.7 63,766.8
Short-term loans [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 88,754.7    
Financing Cash Flow 31,804.3    
Non-cash changes Foreign Exchange Movement (2,036.7)    
Ending Balance 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 26,670.6
Financing Cash Flow   (279.2) (2,872.3)
Non-cash changes Foreign Exchange Movement   423.5 (1,609.0)
Non-cash changes Other Changes   (6,035.9) (6,108.7)
Ending Balance   10,189.0 16,080.6
Guarantee deposits [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 10,189.0    
Financing Cash Flow (639.1)    
Non-cash changes Foreign Exchange Movement 4.5    
Non-cash changes Other Changes (7,824.5)    
Ending Balance 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 19,903.6    
Financing Cash Flow (3,174.0)    
Non-cash changes Foreign Exchange Movement (73.3)    
Non-cash changes Lease modifications 419.7    
Non-cash changes Other Changes 240.9    
Ending Balance 17,316.9 19,903.6  
Bonds payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 91,800.0 150,201.1 191,193.6
Financing Cash Flow   (58,024.9) (38,100.0)
Non-cash changes Foreign Exchange Movement   (382.9) (2,918.9)
Non-cash changes Other Changes   6.7 26.4
Ending Balance   91,800.0 $ 150,201.1
Bonds payable [member] | IFRS 16 [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 91,800.0    
Financing Cash Flow (34,900.0)    
Ending Balance $ 56,900.0 $ 91,800.0