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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance $ 890,777.9 $ 755,808.4 $ 369,620.3
Financing Cash Flow 92,884.7 81,331.8 396,255.2
Non-cash changes Foreign Exchange Movement (62.2) 41,948.3 (12,506.7)
Non-cash changes Lease modifications 2,002.8 11,713.4 2,619.4
Non-cash changes Other Changes 755.7 (24.0) (179.8)
Ending Balance 986,358.9 890,777.9 755,808.4
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance   114,921.3 88,559.0
Financing Cash Flow   (111,960.0) 35,668.4
Non-cash changes Foreign Exchange Movement   (2,372.0) (8,777.5)
Non-cash changes Other Changes   (589.3) (528.6)
Ending Balance     114,921.3
Lease Liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 32,367.6 22,940.7 22,388.6
Financing Cash Flow (3,228.3) (2,690.8) (2,178.3)
Non-cash changes Foreign Exchange Movement (31.7) 137.2 (82.3)
Non-cash changes Lease modifications 2,002.8 11,713.4 2,619.4
Non-cash changes Other Changes 382.0 267.1 193.3
Ending Balance 31,492.4 32,367.6 22,940.7
Bonds payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 852,436.4 614,470.6 256,705.1
Financing Cash Flow 67,511.3 193,479.3 361,255.1
Non-cash changes Foreign Exchange Movement 587.7 44,183.1 (3,646.9)
Non-cash changes Other Changes 362.1 303.4 157.3
Ending Balance 920,897.5 852,436.4 614,470.6
Long-term bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 5,973.9 3,475.8 1,967.6
Financing Cash Flow 693.1 2,503.3 1,510.0
Non-cash changes Other Changes 11.6 (5.2) (1.8)
Ending Balance 6,678.6 $ 5,973.9 $ 3,475.8
Hedging financial liabilities bank loans [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Financing Cash Flow 27,908.6    
Non-cash changes Foreign Exchange Movement (618.2)    
Ending Balance $ 27,290.4