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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
$ in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   $ 997,777.7   $ 853,470.3  
Impairment $ 2,286.0       $ 2,545.6
Ending balance   1,062,542.3 $ 35,848.3 997,777.7 853,470.3
Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 2,165,507.6 2,773,250.8   2,417,177.5 2,165,507.6
Additions (Deductions)   322,493.9   365,827.6 255,074.8
Disposals or retirements   (9,967.8)   (3,576.8) (7,168.0)
Reclassification   10.3      
Lease agreement modification         (824.1)
Effect of disposal of subsidiary   (66.5)      
Effect of acquisition of subsidiary         2,651.2
Effect of exchange rate changes   (5,105.6)   (6,177.5) 1,936.0
Ending balance   3,080,615.1   2,773,250.8 2,417,177.5
Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 1,347,308.8 1,775,473.1   1,563,707.2 1,347,308.8
Additions (Deductions)   255,796.0   220,085.0 219,303.4
Disposals or retirements   (8,520.6)   (3,525.2) (6,784.6)
Reclassification   9.7      
Lease agreement modification         (460.4)
Effect of disposal of subsidiary   (56.7)      
Impairment         2,545.6
Effect of exchange rate changes   (4,628.7)   (4,793.9) 1,794.4
Ending balance   2,018,072.8   1,775,473.1 1,563,707.2
Land and Land Improvements [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   3,524.5   3,561.2  
Ending balance   3,472.7   3,524.5 3,561.2
Land and Land Improvements [Member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 4,036.8 4,049.3   4,067.4 4,036.8
Effect of exchange rate changes   (66.1)   (18.1) 30.6
Ending balance   3,983.2   4,049.3 4,067.4
Land and Land Improvements [Member] | Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 459.2 524.8   506.2 459.2
Additions (Deductions)   27.8   29.4 28.9
Effect of exchange rate changes   (42.1)   (10.8) 18.1
Ending balance   510.5   524.8 506.2
Buildings [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   130,055.4   138,891.7  
Ending balance   184,688.1   130,055.4 138,891.7
Buildings [member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 269,163.9 304,404.5   296,801.9 269,163.9
Additions (Deductions)   75,594.7   9,113.3 26,960.5
Disposals or retirements   (37.0)   (13.4) (75.0)
Effect of acquisition of subsidiary         624.7
Effect of exchange rate changes   (827.6)   (1,497.3) 127.8
Ending balance   379,134.6   304,404.5 296,801.9
Buildings [member] | Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 141,245.9 174,349.1   157,910.2 141,245.9
Additions (Deductions)   20,844.6   17,540.5 16,312.6
Disposals or retirements   (28.8)   (7.3) (74.0)
Impairment         278.1
Effect of exchange rate changes   (718.4)   (1,094.3) 147.6
Ending balance   194,446.5   174,349.1 157,910.2
Machinery and equipment [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   465,490.2   507,631.9  
Ending balance   692,303.4   465,490.2 507,631.9
Machinery and equipment [member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 1,754,170.2 2,042,867.7   1,893,489.6 1,754,170.2
Additions (Deductions)   458,605.8   156,874.2 142,090.4
Disposals or retirements   (9,553.0)   (3,094.2) (5,923.0)
Reclassification   8.8      
Effect of disposal of subsidiary   (51.2)      
Effect of acquisition of subsidiary         1,402.0
Effect of exchange rate changes   (4,125.8)   (4,401.9) 1,750.0
Ending balance   2,487,752.3   2,042,867.7 1,893,489.6
Machinery and equipment [member] | Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 1,188,388.4 1,577,377.5   1,385,857.7 1,188,388.4
Additions (Deductions)   229,985.6   198,189.4 199,185.0
Disposals or retirements   (8,114.3)   (3,049.5) (5,585.4)
Reclassification   8.2      
Effect of disposal of subsidiary   (42.8)      
Impairment         2,256.8
Effect of exchange rate changes   (3,765.3)   (3,620.1) 1,612.9
Ending balance   1,795,448.9   1,577,377.5 1,385,857.7
Office equipment [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   11,507.9   11,274.0  
Ending balance   14,724.6   11,507.9 11,274.0
Office equipment [member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 27,960.8 34,729.6   30,700.0 27,960.8
Additions (Deductions)   8,195.9   4,584.1 3,428.6
Disposals or retirements   (377.8)   (469.2) (1,170.0)
Reclassification   1.5   7.1  
Effect of disposal of subsidiary   (14.8)      
Effect of acquisition of subsidiary         447.9
Effect of exchange rate changes   (142.9)   (92.4) 32.7
Ending balance   42,391.5   34,729.6 30,700.0
Office equipment [member] | Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 16,767.9 23,221.7   19,426.0 16,767.9
Additions (Deductions)   4,938.0   4,325.7 3,751.7
Disposals or retirements   (377.5)   (468.4) (1,125.2)
Reclassification   1.5   7.1  
Effect of disposal of subsidiary   (13.9)      
Impairment         10.7
Effect of exchange rate changes   (102.9)   (68.7) 20.9
Ending balance   27,666.9   23,221.7 19,426.0
Assets under finance leases [member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 841.2     7.1 841.2
Reclassification       (7.1)  
Lease agreement modification         (824.1)
Effect of exchange rate changes         (10.0)
Ending balance         7.1
Assets under finance leases [member] | Accumulated amortization [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance 447.4     7.1 447.4
Additions (Deductions)         25.2
Reclassification       (7.1)  
Lease agreement modification         (460.4)
Effect of exchange rate changes         (5.1)
Ending balance         7.1
Equipment under installation and construction in progress [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance   387,199.7   192,111.5  
Ending balance   167,353.5   387,199.7 192,111.5
Equipment under installation and construction in progress [member] | Cost [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Beginning balance $ 109,334.7 387,199.7   192,111.5 109,334.7
Additions (Deductions)   (219,902.5)   195,256.0 82,595.3
Effect of disposal of subsidiary   (0.5)      
Effect of acquisition of subsidiary         176.6
Effect of exchange rate changes   56.8   (167.8) 4.9
Ending balance   $ 167,353.5   $ 387,199.7 $ 192,111.5