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Equity - Changes in Other Reserves (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Balance, beginning of year | $ 1,663.9 |  | $ 11,774.1 | $ 25,749.3
Exchange differences arising on translation of foreign operations | (28,257.4) |  | (9,409.2) | 8,061.8
Other comprehensive income reclassified to profit or loss upon disposal of subsidiaries |  |  | 36.1 | 138.1
Changes in fair value of available-for-sale financial assets | (154.7) |  | (696.3) | (5.6)
Cumulative (gain)/loss reclassified to profit or loss upon disposal of available-for-sale financial assets | (61.2) |  | 4.1 | (22,070.6)
Gain/(loss) arising on changes in the fair value of hedging instruments | 99.6 |  |  |
Transferred to initial carrying amount of hedged items | (94.9) |  |  |
Share of other comprehensive income/(loss) of associates and joint venture | (99.4) |  | 24.5 | (78.9)
Share of unearned stock-based compensation of associates | (10.3) |  |  |
Other comprehensive loss reclassified to profit or loss upon disposal of associates |  |  | (8.2) |
The proportionate share of other comprehensive income/losses reclassified to profit or loss upon partial disposal of associates |  |  |  | (4.0)
Income tax effect | (3.5) | $ (0.1) | (61.2) | (16.0)
Balance, end of year | (26,917.9) | $ (908.2) | 1,663.9 | 11,774.1
Others - Foreign Currency Translation Reserve [member] |  |  |  |
Balance, beginning of year | 1,661.2 |  | 11,039.9 | 4,502.1
Exchange differences arising on translation of foreign operations | (28,257.4) |  | (9,409.2) | 8,061.8
Other comprehensive income reclassified to profit or loss upon disposal of subsidiaries |  |  | 36.1 | 138.1
Cumulative (gain)/loss reclassified to profit or loss upon disposal of available-for-sale financial assets |  |  |  | (1,595.4)
Share of other comprehensive income/(loss) of associates and joint venture | (101.5) |  | (0.9) | (60.6)
Other comprehensive loss reclassified to profit or loss upon disposal of associates |  |  | (4.7) |
The proportionate share of other comprehensive income/losses reclassified to profit or loss upon partial disposal of associates |  |  |  | (6.1)
Balance, end of year | (26,697.7) |  | 1,661.2 | 11,039.9
Others - Unrealized Gain/Loss from Available-for-sale Financial Assets [member] |  |  |  |
Balance, beginning of year | 2.6 |  | 734.8 | 21,247.5
Changes in fair value of available-for-sale financial assets | (154.7) |  | (696.3) | (5.6)
Cumulative (gain)/loss reclassified to profit or loss upon disposal of available-for-sale financial assets | (61.2) |  | 4.1 | (20,475.2)
Share of other comprehensive income/(loss) of associates and joint venture | 2.1 |  | 24.7 | (18.0)
Other comprehensive loss reclassified to profit or loss upon disposal of associates |  |  | (3.5) |
The proportionate share of other comprehensive income/losses reclassified to profit or loss upon partial disposal of associates |  |  |  | 2.1
Income tax effect | (2.9) |  | (61.2) | (16.0)
Balance, end of year | (214.1) |  | 2.6 | 734.8
Others - Cash Flow Hedges Reserve [member] |  |  |  |
Balance, beginning of year | 0.1 |  | (0.6) | (0.3)
Gain/(loss) arising on changes in the fair value of hedging instruments | 99.6 |  |  |
Transferred to initial carrying amount of hedged items | (94.9) |  |  |
Share of other comprehensive income/(loss) of associates and joint venture |  |  | 0.7 | (0.3)
Income tax effect | (0.6) |  |  |
Balance, end of year | 4.2 |  | $ 0.1 | $ (0.6)
Others - Unearned Stock-Based Employee Compensation [member] |  |  |  |
Share of unearned stock-based compensation of associates | (10.3) |  |  |
Balance, end of year | $ (10.3) |  |  |

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