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Application of New and Amended International Financial Reporting Standards - Schedule of Increase (Decrease) in Net Income Resulting from the Application of IFRS 15 (Detail) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 TWD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 TWD ($) $ / shares | Dec. 31, 2016 TWD ($) $ / shares
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Revenues | $ 215,483 | $ 7,040 | $ 227,514 | $ 229,991
Operating costs | 139,545 | 4,559 | 146,837 | 147,552
Operating expenses | 32,404 | 1,059 | 33,869 | 33,838
Income from operations | 43,644 | 1,426 | 46,703 | 48,105
INCOME TAX EXPENSE | 6,405 | 210 | 7,849 | 7,787
Net income | 38,581 | 1,260 | 40,160 | 41,626
Decrease in net income attributable to: |  |  |  |
Stockholders of the parent | 37,557 | 1,227 | 38,988 | 40,485
Noncontrolling interests | 1,024 | 33 | 1,172 | 1,141
NET INCOME | $ 38,581 | $ 1,260 | $ 40,160 | $ 41,626
EARNINGS PER SHARE |  |  |  |
Basic | (per share) | $ 4.84 | $ 0.16 | $ 5.03 | $ 5.22
Diluted | (per share) | $ 4.83 | $ 0.16 | $ 5.02 | $ 5.21
IFRS 15 [Member] | Increase (Decrease) Due to Application of IFRS 15 [Member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Revenues | $ (3,228) |  |  |
Operating costs | 2,455 |  |  |
Operating expenses | (1,293) |  |  |
Income from operations | (4,390) |  |  |
INCOME TAX EXPENSE | (808) |  |  |
Net income | (3,582) |  |  |
Decrease in net income attributable to: |  |  |  |
Stockholders of the parent | (3,582) |  |  |
NET INCOME | $ (3,582) |  |  |
EARNINGS PER SHARE |  |  |  |
Basic | $ / shares | $ (0.46) |  |  |
Diluted | $ / shares | $ (0.46) |  |  |

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