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Fair Value Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of fair value measurement of assets and liabilities [Line Items] |
Schedule of Carrying Amounts of Financial Assets and Liabilities Not Measured at Fair Value |
| a. | Financial instruments that are not measured at fair value but for which fair value is disclosed
Except those listed in the table below, the Company considers that the carrying amounts of financial assets and liabilities not measured at fair value approximate their fair values or the fair values cannot be reliable estimated.
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities measured at amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds payable |  | $ | — |  |  | $ | — |  |  | $ | 19,980 |  |  | $ | 20,078 |
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, 2019
|  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed stocks |  | $ | 2,454 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,454 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 4,700 |  |  |  | 4,700 |
|  | $ | 2,454 |  |  | $ | — |  |  | $ | 4,700 |  |  | $ | 7,154 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
December 31, 2020
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Listed stocks |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | 8 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 677 |  |  |  | 677 |
|  | $ | 8 |  |  | $ | 2 |  |  | $ | 677 |  |  | $ | 687 |
Hedging financial assets |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Financial assets at FVOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed stocks |  | $ | 2,754 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,754 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 4,439 |  |  |  | 4,439 |
|  | $ | 2,754 |  |  | $ | — |  |  | $ | 4,439 |  |  | $ | 7,193 |
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
|  | 2019 |  | 2020
Discount for lack of marketability |  | 13.73%-20.00% |  | 14.73%-20.00%
Noncontrolling interests discount |  | 21.45%-25.00% |  | 17.29%-25.00%
Schedule of Impact of Decrease in Discount for Lack of Marketability or Noncontrolling Interests |
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Discount for lack of marketability 5% decrease |  | $ | 342 |  |  | $ | 320 |
Noncontrolling interests discount 5% decrease |  | $ | 54 |  |  | $ | 47 |
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 |  | $ | 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 financial assets 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 financial assets 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 | ) |  |  |  |  |  |  |  |
2020
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, 2020 |  | $ | 778 |  |  | $ | 4,700 |  |  | $ | 5,478 |
Reclassified from investments accounted for using equity method |  |  | — |  |  |  | 2 |  |  |  | 2 |
Recognized in profit or loss under “Other gains and losses” |  |  | (101 | ) |  |  | — |  |  |  | (101 | )
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” |  |  | — |  |  |  | (263 | ) |  |  | (263 | )
Balance at December 31, 2020 |  | $ | 677 |  |  | $ | 4,439 |  |  | $ | 5,116 |
Unrealized loss in 2020 |  | $ | (101 | ) |  |  |  |  |  |  |  |

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