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Equity - Unrealized Gain or Loss on Available-for-sale Financial Assets (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Jan. 01, 2019 TWD ($) | Jan. 01, 2018 TWD ($)
Beginning balance | $ 384,529 |  | $ 369,410 | $ 366,928 |  |
Unrealized gain or loss on available-for-sale financial assets |  |  |  | 605 |  |
Income tax relating to unrealized gain and loss on available-for-sale financial assets | 0 |  | 0 | (3) |  |
Ending balance | 384,272 | $ 12,848 | 384,529 | 369,410 |  |
Effect of retrospective application of IFRS 9 |  |  |  |  | $ 0 | $ 883
Unrealized gain (loss) on available-for-sale financial assets [Member] |  |  |  |  |  |
Beginning balance | 0 |  | 558 | (51) |  |
Unrealized gain or loss on available-for-sale financial assets |  |  |  | 607 |  |
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  |  | 2 |  |
Amount reclassified from equity to profit or loss on disposal of available-for-sale financial assets |  |  |  | 0 |  |
Ending balance | $ 0 | $ 0 | $ 0 | $ 558 |  |
Effect of retrospective application of IFRS 9 |  |  |  |  |  | $ (558)

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