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Fair Value Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of fair value measurement of assets and liabilities [Line Items] |
Carrying Amounts And Fair Value of Financial Assets and Liabilities |
| b. | Financial instruments that are measured at fair value on a recurring basis
December 31, 201 8
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-listed stocks |  | $ | — |  |  | $ | — |  |  | $ | 517 |  |  | $ | 517 |
Hedging financial assets |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Financial assets at FVOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  | $ | 2,900 |  |  | $ | — |  |  | $ | 4,033 |  |  | $ | 6,933 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
December 31, 201 9
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Listed stocks |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 778 |  |  |  | 778 |
|  | $ | 1 |  |  | $ | — |  |  | $ | 778 |  |  | $ | 779 |
Hedging financial assets |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Financial assets at FVOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  | $ | 2,454 |  |  | $ | — |  |  | $ | 4,700 |  |  | $ | 7,154 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Percentage Decrease in Discount for Lack of Marketability or Noncontrolling Interests | A decrease in discount for the lack of marketability or noncontrolling interests discount would result in increases in the fair values.
|  | December 31
|  | 2018 |  | 2019
Discount for lack of marketability |  | 12.73%-20.00% |  | 13.73%-20.00%
Noncontrolling interests discount |  | 24.41%-25.00% |  | 21.45%-25.00%
Schedule of Impact of Decrease in Discount for Lack of Marketability or Noncontrolling Interests |
|  | December 31 |
|  | 2019 |  |  | 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Discount for lack of marketability 5% decrease |  | $ | 268 |  |  | $ | 342 |
Noncontrolling interests discount 5% decrease |  | $ | 37 |  |  | $ | 54 |
Level 3 [Member] |
Disclosure of fair value measurement of assets and liabilities [Line Items] |
Schedule of Reconciliations for Financial Assets | The reconciliations for financial assets measured at Level 3 are listed below: 2018
Financial Assets |  | Measured at Fair Value through Profit or Loss |  |  | Measured at Fair Value through Other Comprehensive Income |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Balance at January 1, 2018 (IAS 39) |  | $ | — |  |  | $ | — |  |  | $ | — |
The effect on retrospective adjustment of applying IFRS 9 |  |  | 543 |  |  |  | 3,925 |  |  |  | 4,468 |
Balance at January 1, 2018 (IFRS 9) |  |  | 543 |  |  |  | 3,925 |  |  |  | 4,468 |
Acquisition |  |  | — |  |  |  | 290 |  |  |  | 290 |
Recognized in profit or loss under “Other gains and losses” |  |  | (26 | ) |  |  | — |  |  |  | (26 | )
Recognized in other comprehensive income under “Unrealized gain or loss on investments in equity instruments at fair value through other comprehensive income” |  |  | — |  |  |  | (175 | ) |  |  | (175 | )
Proceeds from return of investees |  |  | — |  |  |  | (7 | ) |  |  | (7 | )
Balance at December 31, 2018 |  | $ | 517 |  |  | $ | 4,033 |  |  | $ | 4,550 |
Unrealized loss in 2018 |  | $ | (26 | ) |  |  |  |  |  |  |  |
2019
Financial Assets |  | Measured at Fair Value through Profit or Loss |  |  | Measured at Fair Value through Other Comprehensive Income |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Balance at January 1, 2019 |  | $ | 517 |  |  | $ | 4,033 |  |  | $ | 4,550 |
Acquisition |  |  | 300 |  |  |  | — |  |  |  | 300 |
Recognized in profit or loss under “Other gains and losses” |  |  | (39 | ) |  |  | — |  |  |  | (39 | )
Recognized in other comprehensive income under “Unrealized gain or loss on investments in equity instruments at fair value through other comprehensive income” |  |  | — |  |  |  | 676 |  |  |  | 676 |
Proceed from return of investments |  |  | — |  |  |  | (9 | ) |  |  | (9 | )
Balance at December 31, 2019 |  | $ | 778 |  |  | $ | 4,700 |  |  | $ | 5,478 |
Unrealized loss in 2019 |  | $ | (39 | ) |  |  |  |  |  |  |  |

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