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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance $ 986,358.9 $ 890,777.9 $ 755,808.4
Financing Cash Flow 26,020.2 92,884.7 81,331.8
Non-cash changes Foreign Exchange Movement 33,646.2 (62.2) 41,948.3
Non-cash changes Lease modifications 3,286.6 2,002.8 11,713.4
Non-cash changes Other Changes 779.2 755.7 (24.0)
Ending Balance 1,050,091.1 986,358.9 890,777.9
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   0.0 114,921.3
Financing Cash Flow     (111,960.0)
Non-cash changes Foreign Exchange Movement     (2,372.0)
Non-cash changes Lease modifications     0.0
Non-cash changes Other Changes     (589.3)
Ending Balance     0.0
Hedging financial liabilities bank loans [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 27,290.4 0.0  
Financing Cash Flow (26,496.6) 27,908.6  
Non-cash changes Foreign Exchange Movement (793.8) (618.2)  
Non-cash changes Lease modifications 0.0 0.0  
Non-cash changes Other Changes 0.0 0.0  
Ending Balance 0.0 27,290.4 0.0
Bonds payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 920,897.5 852,436.4 614,470.6
Financing Cash Flow 27,264.3 67,511.3 193,479.3
Non-cash changes Foreign Exchange Movement 35,202.9 587.7 44,183.1
Non-cash changes Lease modifications 0.0 0.0 0.0
Non-cash changes Other Changes 387.8 362.1 303.4
Ending Balance 983,752.5 920,897.5 852,436.4
Long-term bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 6,678.6 5,973.9 3,475.8
Financing Cash Flow 28,601.4 693.1 2,503.3
Non-cash changes Foreign Exchange Movement (763.7) 0.0 0.0
Non-cash changes Lease modifications 0.0 0.0 0.0
Non-cash changes Other Changes 18.0 11.6 (5.2)
Ending Balance 34,534.3 6,678.6 5,973.9
Lease Liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 31,492.4 32,367.6 22,940.7
Financing Cash Flow (3,348.9) (3,228.3) (2,690.8)
Non-cash changes Foreign Exchange Movement 0.8 (31.7) 137.2
Non-cash changes Lease modifications 3,286.6 2,002.8 11,713.4
Non-cash changes Other Changes 373.4 382.0 267.1
Ending Balance $ 31,804.3 $ 31,492.4 $ 32,367.6