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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

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