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Application of New and Amended International Financial Reporting Standards - Schedule of Impact on Assets, Liabilities and Equity from Initial Retrospective Application of IFRS 16 (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |  |  |
Prepayments - current | $ 1,883 | $ 63 | $ 1,628 | $ 1,873 |  |
Property, plant and equipment | 283,694 | 9,484 | 287,605 | 288,914 |  |
Right-of-use assets | 11,364 | 380 | 12,163 | 0 |  |
Deferred income tax assets | 3,259 | 109 | 3,580 | 3,554 |  |
Prepayments - noncurrent | 2,679 | 90 | 3,049 | 3,463 |  |
Contract liabilities - current | 16,840 | 563 | 10,902 | 10,688 |  |
Lease liabilities - current | 3,291 | 110 | 3,394 | 0 |  |
Other payables | 22,953 | 767 | 23,267 | 23,315 |  |
Other current liabilities | 984 | 33 | 1,168 | 1,382 |  |
Contract liabilities - noncurrent | 6,841 | 229 | 6,078 | 2,595 |  |
Deferred income tax liabilities | 1,912 | 64 | 1,992 | 1,992 |  |
Lease liabilities - noncurrent | 6,467 | 216 | 6,946 | 0 |  |
Other noncurrent liabilities | 1,543 | 52 | 1,310 | 4,793 |  |
Unappropriated earnings | 65,984 | 2,206 | 66,575 | 66,626 |  |
NONCONTROLLING INTERESTS | $ 10,115 | $ 338 | 9,837 | 9,857 |  |
Carrying Amount [Member] |  |  |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |  |  |
Prepayments - current |  |  | 1,873 |  |  |
Property, plant and equipment |  |  | 288,914 | $ 940,891 | $ 946,460 | $ 936,128
Right-of-use assets |  |  | 0 |  |  |
Deferred income tax assets |  |  | 3,554 |  |  |
Prepayments - noncurrent |  |  | 3,463 |  |  |
Contract liabilities - current |  |  | 10,688 |  |  |
Lease liabilities - current |  |  | 0 |  |  |
Other payables |  |  | 23,315 |  |  |
Other current liabilities |  |  | 1,382 |  |  |
Contract liabilities - noncurrent |  |  | 2,595 |  |  |
Deferred income tax liabilities |  |  | 1,992 |  |  |
Lease liabilities - noncurrent |  |  | 0 |  |  |
Other noncurrent liabilities |  |  | 4,793 |  |  |
Unappropriated earnings |  |  | 66,626 |  |  |
NONCONTROLLING INTERESTS |  |  | 9,857 |  |  |
Effect of Retrospective Application of IFRS 16 [Member] | Increase (Decrease) Due to Application of IFRS 16 [Member] |  |  |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |  |  |
Prepayments - current |  |  | (245) |  |  |
Property, plant and equipment |  |  | (1,309) |  |  |
Right-of-use assets |  |  | 12,163 |  |  |
Deferred income tax assets |  |  | 26 |  |  |
Prepayments - noncurrent |  |  | (414) |  |  |
Total effect on assets |  |  | 10,221 |  |  |
Contract liabilities - current |  |  | 214 |  |  |
Lease liabilities - current |  |  | 3,394 |  |  |
Other payables |  |  | (48) |  |  |
Other current liabilities |  |  | (214) |  |  |
Contract liabilities - noncurrent |  |  | 3,483 |  |  |
Lease liabilities - noncurrent |  |  | 6,946 |  |  |
Other noncurrent liabilities |  |  | (3,483) |  |  |
Total effect on liabilities |  |  | 10,292 |  |  |
Unappropriated earnings |  |  | (51) |  |  |
NONCONTROLLING INTERESTS |  |  | (20) |  |  |
Total effect on equity |  |  | $ (71) |  |  |

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