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Property, Plant and Equipment - Summary of assets used by the Company (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 2,693,837.0   $ 1,975,118.7  
Ending balance 3,064,475.0 $ 100,080.9 2,693,837.0 $ 1,975,118.7
Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 2,693,815.7   1,975,114.0  
Ending balance 3,064,424.3   2,693,815.7 1,975,114.0
Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 6,362,521.9   5,237,145.1 4,426,223.8
Additions (Deductions) 897,518.8   1,139,892.1 835,406.3
Disposals or retirements (32,436.7)   (27,792.4) (26,566.7)
Transfers from right-of-use assets 4.4      
Transfers from assets subject to operating leases 80.4     1,479.1
Transfers to assets subject to operating leases (71.1)   (65.8) (244.6)
Effect of exchange rate changes (9,072.2)   13,342.9 847.2
Ending balance 7,218,545.5   6,362,521.9 5,237,145.1
Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,668,706.2   3,262,031.1 2,871,637.9
Additions (Deductions) 519,466.2   425,416.3 411,483.9
Disposals or retirements (31,314.9)   (26,640.9) (22,599.2)
Transfers from right-of-use assets 1.9      
Transfers from assets subject to operating leases 53.5     451.9
Transfers to assets subject to operating leases (45.7)   (40.3) (68.3)
Impairment     790.7 274.4
Effect of exchange rate changes (2,746.0)   7,149.3 850.5
Ending balance 4,154,121.2   3,668,706.2 3,262,031.1
Land and Land Improvements [Member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 7,105.7   5,988.4  
Ending balance 7,063.9   7,105.7 5,988.4
Land and Land Improvements [Member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 7,661.8   6,488.2 3,942.6
Additions (Deductions) 0.0   816.4 2,587.2
Effect of exchange rate changes (39.8)   357.2 (41.6)
Ending balance 7,622.0   7,661.8 6,488.2
Land and Land Improvements [Member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 556.1   499.8 506.1
Additions (Deductions) 1.3   1.4 1.3
Effect of exchange rate changes 0.7   54.9 (7.6)
Ending balance 558.1   556.1 499.8
Buildings [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 294,108.5   270,432.5  
Ending balance 430,809.1   294,108.5 270,432.5
Buildings [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 637,046.9   576,597.8 522,447.4
Additions (Deductions) 182,033.3   59,443.8 53,971.3
Disposals or retirements (585.5)   (236.8) (41.1)
Transfers from assets subject to operating leases       35.5
Effect of exchange rate changes (671.7)   1,242.1 184.7
Ending balance 817,823.0   637,046.9 576,597.8
Buildings [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 342,938.4   306,165.3 271,799.5
Additions (Deductions) 45,052.9   35,982.4 34,331.6
Disposals or retirements (583.0)   (225.6) (36.5)
Transfers from assets subject to operating leases       15.1
Effect of exchange rate changes (394.4)   1,016.3 55.6
Ending balance 387,013.9   342,938.4 306,165.3
Machinery and equipment [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,031,061.7   1,081,209.8  
Ending balance 1,685,977.1   1,031,061.7 1,081,209.8
Machinery and equipment [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 4,295,942.6   3,984,749.2 3,607,005.7
Additions (Deductions) 1,120,848.7   330,782.7 401,659.0
Disposals or retirements (28,525.9)   (25,846.4) (26,192.2)
Transfers from right-of-use assets 4.4      
Transfers from assets subject to operating leases 80.4     1,443.6
Transfers to assets subject to operating leases (71.1)   (65.8) (244.6)
Effect of exchange rate changes (3,293.5)   6,322.9 1,077.7
Ending balance 5,384,985.6   4,295,942.6 3,984,749.2
Machinery and equipment [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,264,880.9   2,903,539.4 2,555,530.0
Additions (Deductions) 463,825.3   380,216.2 368,777.7
Disposals or retirements (27,407.7)   (24,706.7) (22,230.1)
Transfers from right-of-use assets 1.9      
Transfers from assets subject to operating leases 53.5     436.8
Transfers to assets subject to operating leases (45.7)   (40.3) (68.3)
Impairment       274.4
Effect of exchange rate changes (2,299.7)   5,872.3 818.9
Ending balance 3,699,008.5   3,264,880.9 2,903,539.4
Office equipment [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 25,487.9   24,327.6  
Ending balance 33,075.1   25,487.9 24,327.6
Office equipment [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 85,028.0   76,154.2 68,862.7
Additions (Deductions) 18,205.5   10,325.3 7,643.0
Disposals or retirements (3,325.3)   (1,709.2) (333.4)
Effect of exchange rate changes (83.1)   257.7 (18.1)
Ending balance 99,825.1   85,028.0 76,154.2
Office equipment [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 59,540.1   51,826.6 43,802.3
Additions (Deductions) 10,586.7   9,216.3 8,373.3
Disposals or retirements (3,324.2)   (1,708.6) (332.6)
Effect of exchange rate changes (52.6)   205.8 (16.4)
Ending balance 66,750.0   59,540.1 51,826.6
Equipment under installation and construction in progress [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,336,051.9   593,155.7  
Ending balance 907,499.1   1,336,051.9 593,155.7
Equipment under installation and construction in progress [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,336,842.6   593,155.7 223,965.4
Additions (Deductions) (423,568.7)   738,523.9 369,545.8
Effect of exchange rate changes (4,984.1)   5,163.0 (355.5)
Ending balance 908,289.8   1,336,842.6 593,155.7
Equipment under installation and construction in progress [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 790.7   0.0 0.0
Impairment     790.7 0.0
Ending balance $ 790.7   $ 790.7 $ 0.0