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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance $ 755,808.4 $ 369,620.3 $ 192,739.2
Financing Cash Flow 81,331.8 396,255.2 172,143.7
Non-cash changes Foreign Exchange Movement 41,948.3 (12,506.7) (3,228.8)
Non-cash changes Lease modifications 11,713.4 2,619.4 7,742.2
Non-cash changes Other Changes (24.0) (179.8) 224.0
Ending Balance 890,777.9 755,808.4 369,620.3
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 114,921.3 88,559.0 118,522.3
Financing Cash Flow (111,960.0) 35,668.4 (31,571.6)
Non-cash changes Foreign Exchange Movement (2,372.0) (8,777.5) 1,608.3
Non-cash changes Other Changes (589.3) (528.6)  
Ending Balance   114,921.3 88,559.0
Lease Liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 22,940.7 22,388.6 17,316.9
Financing Cash Flow (2,690.8) (2,178.3) (2,819.7)
Non-cash changes Foreign Exchange Movement 137.2 (82.3) (78.5)
Non-cash changes Lease modifications 11,713.4 2,619.4 7,742.2
Non-cash changes Other Changes 267.1 193.3 227.7
Ending Balance 32,367.6 22,940.7 22,388.6
Bonds payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 614,470.6 256,705.1 56,900.0
Financing Cash Flow 193,479.3 361,255.1 204,535.0
Non-cash changes Foreign Exchange Movement 44,183.1 (3,646.9) (4,758.6)
Non-cash changes Other Changes 303.4 157.3 28.7
Ending Balance 852,436.4 614,470.6 256,705.1
Long-term bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning Balance 3,475.8 1,967.6  
Financing Cash Flow 2,503.3 1,510.0 2,000.0
Non-cash changes Other Changes (5.2) (1.8) (32.4)
Ending Balance $ 5,973.9 $ 3,475.8 $ 1,967.6