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Application of New and Amended International Financial Reporting Standards - Schedule of Anticipated Impacts on Assets, Liabilities and Equity from Retrospective Application of IFRS 16 (Detail) $ in Millions, $ in Millions | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | --- | ---
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Prepayments - current |  | $ 1,873 | $ 61 | $ 2,188
Property, plant and equipment |  | 288,914 | 9,439 | 288,708
Deferred income tax assets |  | 3,554 | 116 | 2,730
Prepayments - noncurrent |  | 3,463 | 113 | 3,573
Contract liabilities - current |  | 10,688 | 349 | 0
Other payables |  | 23,315 | 762 | 25,001
Other current liabilities |  | 1,382 | 45 | 1,081
Contract liabilities - noncurrent |  | 2,595 | 85 | 0
Deferred income tax liabilities |  | 1,992 | 65 | 1,430
Other noncurrent liabilities |  | 4,793 | 157 | 3,458
Unappropriated earnings |  | 66,626 | 2,177 | 54,633
NONCONTROLLING INTERESTS |  | 9,857 | $ 322 | $ 8,474
IFRS 16 [Member] |  |  |  |
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Prepayments - current | $ 1,628 | 1,873 |  |
Property, plant and equipment | 287,605 | 288,914 |  |
Right-of-use assets | 12,163 | 0 |  |
Deferred income tax assets | 3,580 | 3,554 |  |
Prepayments - noncurrent | 3,049 | 3,463 |  |
Contract liabilities - current | 10,902 | 10,688 |  |
Lease liabilities - current | 3,394 | 0 |  |
Other payables | 23,267 | 23,315 |  |
Other current liabilities | 1,168 | 1,382 |  |
Contract liabilities - noncurrent | 6,078 | 2,595 |  |
Deferred income tax liabilities | 1,992 | 1,992 |  |
Lease liabilities - noncurrent | 6,946 | 0 |  |
Other noncurrent liabilities | 1,310 | 4,793 |  |
Unappropriated earnings | 66,575 | 66,626 |  |
NONCONTROLLING INTERESTS | 9,837 | $ 9,857 |  |
IFRS 16 [Member] | Increase (Decrease) Due to Changes Required by IFRSs [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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