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Net Income and Other Comprehensive Income (Loss) - Depreciation and Amortization Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Property, plant and equipment | $ 28,143 |  | $ 29,087 | $ 30,350
Investment properties | 21 |  | 19 | 18
Intangible assets | 3,766 |  | 3,379 | 3,080
Total depreciation and amortization expenses | 31,930 |  | 32,485 | 33,448
Depreciation expenses | 28,164 | $ 950 | 29,106 | 30,368
Amortization expenses | 3,766 | $ 127 | 3,379 | 3,080
Operating costs [Member] |  |  |  |
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Depreciation expenses | 26,402 |  | 27,214 | 28,292
Amortization expenses | 3,473 |  | 3,042 | 2,742
Operating expenses [Member] |  |  |  |
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Depreciation expenses | 1,762 |  | 1,892 | 2,076
Marketing expenses [Member] |  |  |  |
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Amortization expenses | 154 |  | 173 | 178
General and administrative expenses [Member] |  |  |  |
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Amortization expenses | 104 |  | 126 | 116
Research and development expenses [Member] |  |  |  |
Disclosure of depreciation and amortization [Line Items] |  |  |  |
Amortization expenses | $ 35 |  | $ 38 | $ 44

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