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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance $ 1,062,542.3   $ 997,777.7  
Impairment 423.5 $ 13.8    
Ending balance 1,072,050.3 $ 35,022.9 1,062,542.3 $ 997,777.7
Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,080,615.1   2,773,250.8 2,417,177.5
Additions (Deductions) 300,024.4   322,493.9 365,827.6
Disposals or retirements (7,174.2)   (9,967.8) (3,576.8)
Reclassification     10.3  
Effect of disposal of subsidiary     (66.5)  
Effect of exchange rate changes (686.2)   (5,105.6) (6,177.5)
Ending balance 3,372,779.1   3,080,615.1 2,773,250.8
Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 2,018,072.8   1,775,473.1 1,563,707.2
Additions (Deductions) 288,124.9   255,796.0 220,085.0
Disposals or retirements (5,962.6)   (8,520.6) (3,525.2)
Reclassification     9.7  
Impairment 423.5      
Effect of disposal of subsidiary     (56.7)  
Effect of exchange rate changes 70.2   (4,628.7) (4,793.9)
Ending balance 2,300,728.8   2,018,072.8 1,775,473.1
Land and Land Improvements [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,472.7   3,524.5  
Ending balance 3,460.8   3,472.7 3,524.5
Land and Land Improvements [Member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 3,983.2   4,049.3 4,067.4
Effect of exchange rate changes 28.2   (66.1) (18.1)
Ending balance 4,011.4   3,983.2 4,049.3
Land and Land Improvements [Member] | Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 510.5   524.8 506.2
Additions (Deductions) 20.9   27.8 29.4
Effect of exchange rate changes 19.2   (42.1) (10.8)
Ending balance 550.6   510.5 524.8
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 184,688.1   130,055.4  
Ending balance 200,340.2   184,688.1 130,055.4
Buildings [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 379,134.6   304,404.5 296,801.9
Additions (Deductions) 40,396.4   75,594.7 9,113.3
Disposals or retirements (410.9)   (37.0) (13.4)
Effect of exchange rate changes (405.8)   (827.6) (1,497.3)
Ending balance 418,714.3   379,134.6 304,404.5
Buildings [member] | Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 194,446.5   174,349.1 157,910.2
Additions (Deductions) 24,293.4   20,844.6 17,540.5
Disposals or retirements (399.0)   (28.8) (7.3)
Effect of exchange rate changes 33.2   (718.4) (1,094.3)
Ending balance 218,374.1   194,446.5 174,349.1
Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 692,303.4   465,490.2  
Ending balance 679,481.2   692,303.4 465,490.2
Machinery and equipment [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 2,487,752.3   2,042,867.7 1,893,489.6
Additions (Deductions) 247,042.3   458,605.8 156,874.2
Disposals or retirements (5,972.5)   (9,553.0) (3,094.2)
Reclassification     8.8  
Effect of disposal of subsidiary     (51.2)  
Effect of exchange rate changes (61.9)   (4,125.8) (4,401.9)
Ending balance 2,728,760.2   2,487,752.3 2,042,867.7
Machinery and equipment [member] | Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 1,795,448.9   1,577,377.5 1,385,857.7
Additions (Deductions) 258,195.3   229,985.6 198,189.4
Disposals or retirements (4,773.6)   (8,114.3) (3,049.5)
Reclassification     8.2  
Impairment 423.5      
Effect of disposal of subsidiary     (42.8)  
Effect of exchange rate changes (15.1)   (3,765.3) (3,620.1)
Ending balance 2,049,279.0   1,795,448.9 1,577,377.5
Office equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 14,724.6   11,507.9  
Ending balance 15,857.1   14,724.6 11,507.9
Office equipment [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 42,391.5   34,729.6 30,700.0
Additions (Deductions) 6,773.4   8,195.9 4,584.1
Disposals or retirements (790.8)   (377.8) (469.2)
Reclassification     1.5 7.1
Effect of disposal of subsidiary     (14.8)  
Effect of exchange rate changes 8.1   (142.9) (92.4)
Ending balance 48,382.2   42,391.5 34,729.6
Office equipment [member] | Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 27,666.9   23,221.7 19,426.0
Additions (Deductions) 5,615.3   4,938.0 4,325.7
Disposals or retirements (790.0)   (377.5) (468.4)
Reclassification     1.5 7.1
Effect of disposal of subsidiary     (13.9)  
Effect of exchange rate changes 32.9   (102.9) (68.7)
Ending balance 32,525.1   27,666.9 23,221.7
Assets under finance leases [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance       7.1
Reclassification       (7.1)
Assets under finance leases [member] | Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance       7.1
Reclassification       (7.1)
Equipment under installation and construction in progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 167,353.5   387,199.7  
Ending balance 172,911.0   167,353.5 387,199.7
Equipment under installation and construction in progress [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Beginning balance 167,353.5   387,199.7 192,111.5
Additions (Deductions) 5,812.3   (219,902.5) 195,256.0
Effect of disposal of subsidiary     (0.5)  
Effect of exchange rate changes (254.8)   56.8 (167.8)
Ending balance $ 172,911.0   $ 167,353.5 $ 387,199.7