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Equity - Appropriations of Earnings (Detail) - TWD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Special reserve | $ 0 |  | $ 0
Cash dividends per share | $ 4.796 | $ 4.9419 | $ 5.4852
Total retained earnings [Member] |  |  |
Special reserve | $ 0 | $ 5 | $ 0
Reversal of special reserve | 5 |  |
Cash dividends | $ 37,205 | $ 38,336 | $ 42,551

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