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Property, Plant and Equipment - Summary of Property, Plant and Equipment-2018 (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 1,352,377.4   $ 1,072,050.3  
Additions (Deductions) 525,720.7   564,283.0 $ 300,024.4
Ending balance $ 1,555,589.1 $ 55,398.5 1,352,377.4 1,072,050.3
Land and Land Improvements [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     3,460.8  
Ending balance       3,460.8
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     200,340.2  
Ending balance       200,340.2
Machinery and equipment        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     679,481.2  
Impairment       423.5
Ending balance       679,481.2
Office equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     15,857.1  
Ending balance       15,857.1
Equipment under installation and construction in progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     172,911.0  
Ending balance       172,911.0
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     3,372,779.1 3,080,615.1
Additions (Deductions)       300,024.4
Disposals or retirements       (7,174.2)
Effect of exchange rate changes       (686.2)
Ending balance       3,372,779.1
Cost [member] | Land and Land Improvements [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     4,011.4 3,983.2
Effect of exchange rate changes       28.2
Ending balance       4,011.4
Cost [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     418,714.3 379,134.6
Additions (Deductions)       40,396.4
Disposals or retirements       (410.9)
Effect of exchange rate changes       (405.8)
Ending balance       418,714.3
Cost [member] | Machinery and equipment        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     2,728,760.2 2,487,752.3
Additions (Deductions)       247,042.3
Disposals or retirements       (5,972.5)
Effect of exchange rate changes       (61.9)
Ending balance       2,728,760.2
Cost [member] | Office equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     48,382.2 42,391.5
Additions (Deductions)       6,773.4
Disposals or retirements       (790.8)
Effect of exchange rate changes       8.1
Ending balance       48,382.2
Cost [member] | Equipment under installation and construction in progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     172,911.0 167,353.5
Additions (Deductions)       5,812.3
Effect of exchange rate changes       (254.8)
Ending balance       172,911.0
Accumulated depreciation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     2,300,728.8 2,018,072.8
Additions (Deductions)       288,124.9
Disposals or retirements       (5,962.6)
Impairment       423.5
Effect of exchange rate changes       70.2
Ending balance       2,300,728.8
Accumulated depreciation [member] | Land and Land Improvements [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     550.6 510.5
Additions (Deductions)       20.9
Effect of exchange rate changes       19.2
Ending balance       550.6
Accumulated depreciation [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     218,374.1 194,446.5
Additions (Deductions)       24,293.4
Disposals or retirements       (399.0)
Effect of exchange rate changes       33.2
Ending balance       218,374.1
Accumulated depreciation [member] | Machinery and equipment        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     2,049,279.0 1,795,448.9
Additions (Deductions)       258,195.3
Disposals or retirements       (4,773.6)
Impairment       423.5
Effect of exchange rate changes       (15.1)
Ending balance       2,049,279.0
Accumulated depreciation [member] | Office equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance     $ 32,525.1 27,666.9
Additions (Deductions)       5,615.3
Disposals or retirements       (790.0)
Effect of exchange rate changes       32.9
Ending balance       $ 32,525.1