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Property, Plant and Equipment - Summary of assets used by the Company (Detail)
$ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 1,555,589.1      
Additions 366,978.5   $ 277,237.9  
Ending balance 1,722,679.1 $ 61,722.7   $ 1,555,589.1
Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,554,585.9   1,352,313.9 1,352,313.9
Ending balance 1,722,112.1   1,493,522.9 1,554,585.9
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 4,426,223.8   3,911,596.3 3,911,596.3
Additions 366,978.5   277,237.9  
Disposals or retirements (7,026.7)   (3,194.1)  
Transfers from assets subject to operating leases 691.7   22.3  
Transfers to assets subject to operating leases (244.6)      
Effect of exchange rate changes 653.1   (5,167.4)  
Ending balance 4,787,275.8   4,180,495.0 4,426,223.8
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 2,871,637.9   2,559,282.4 2,559,282.4
Additions 199,341.9   134,575.8  
Disposals or retirements (6,836.5)   (3,021.0)  
Transfers from assets subject to operating leases 213.3   8.2  
Transfers to assets subject to operating leases (68.3)      
Impairment 274.4      
Effect of exchange rate changes 601.0   (3,873.3)  
Ending balance 3,065,163.7   2,686,972.1 2,871,637.9
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 3,436.5   3,453.1 3,453.1
Ending balance 6,010.7   3,447.8 3,436.5
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 3,942.6   3,991.8 3,991.8
Additions 2,587.2      
Effect of exchange rate changes (16.1)   (14.6)  
Ending balance 6,513.7   3,977.2 3,942.6
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 506.1   538.7 538.7
Additions 0.7   0.8  
Effect of exchange rate changes (3.8)   (10.1)  
Ending balance 503.0   529.4 506.1
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 250,647.9   195,015.7 195,015.7
Ending balance 268,311.4   248,188.0 250,647.9
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 522,447.4   438,075.0 438,075.0
Additions 34,524.3   66,843.8  
Disposals or retirements (19.9)   (19.7)  
Transfers from assets subject to operating leases 35.5   22.3  
Effect of exchange rate changes 86.0   (1,126.9)  
Ending balance 557,073.3   503,794.5 522,447.4
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 271,799.5   243,059.3 243,059.3
Additions 16,942.3   13,167.7  
Disposals or retirements (17.1)   (15.8)  
Transfers from assets subject to operating leases 15.6   8.2  
Effect of exchange rate changes 21.6   (612.9)  
Ending balance 288,761.9   255,606.5 271,799.5
Machinery and equipment | Property, plant and equipment not subject to operating leases [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,051,475.7   608,357.0 608,357.0
Ending balance 1,090,322.2   1,065,090.8 1,051,475.7
Machinery and equipment | 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 3,607,005.7   2,886,623.0 2,886,623.0
Additions 217,478.9   575,722.1  
Disposals or retirements (6,882.0)   (3,060.2)  
Transfers from assets subject to operating leases 656.2      
Transfers to assets subject to operating leases (244.6)      
Effect of exchange rate changes 672.2   (3,760.4)  
Ending balance 3,818,686.4   3,455,524.5 3,607,005.7
Machinery and equipment | 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 2,555,530.0   2,278,266.0 2,278,266.0
Additions 178,535.5   118,235.1  
Disposals or retirements (6,695.4)   (2,892.0)  
Transfers from assets subject to operating leases 197.7      
Transfers to assets subject to operating leases (68.3)      
Impairment 274.4      
Effect of exchange rate changes 590.3   (3,175.4)  
Ending balance 2,728,364.2   2,390,433.7 2,555,530.0
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 25,060.4   17,193.0 17,193.0
Ending balance 24,995.4   23,237.4 25,060.4
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 68,862.7   54,611.4 54,611.4
Additions 3,799.5   9,268.1  
Disposals or retirements (124.8)   (114.2)  
Effect of exchange rate changes (7.4)   (125.4)  
Ending balance 72,530.0   63,639.9 68,862.7
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 43,802.3   37,418.4 37,418.4
Additions 3,863.4   3,172.2  
Disposals or retirements (124.0)   (113.2)  
Effect of exchange rate changes (7.1)   (74.9)  
Ending balance 47,534.6   40,402.5 43,802.3
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 223,965.4   528,295.1 528,295.1
Ending balance 332,472.4   153,558.9 223,965.4
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 223,965.4   528,295.1 528,295.1
Additions 108,588.6   (374,596.1)  
Effect of exchange rate changes (81.6)   (140.1)  
Ending balance $ 332,472.4   $ 153,558.9 $ 223,965.4