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Fair Value Information (Tables) | 12 Months Ended
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Dec. 31, 2024
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 | 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.
|  | December 31, 2023 |  |  | December 31, 2024 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at amortized cost |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |  |  | $ | 2,002 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities at amortized cost |  |  |  |  |  |  |  |  |  |  |  |
Bonds payable |  | $ | 30,483 |  |  | $ | 30,469 |  |  | $ | 30,488 |  |  | $ | 30,485 |
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, 2023
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Listed stocks |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 793 |  |  |  | 793 |
Limited partnership |  |  | — |  |  |  | — |  |  |  | 219 |  |  |  | 219 |
Other investing agreements |  |  | — |  |  |  | — |  |  |  | 24 |  |  |  | 24 |
|  | $ | — |  |  | $ | 1 |  |  | $ | 1,036 |  |  | $ | 1,037 |
Financial assets at FVOCI |  |  |  |  |  |  |  |  |  |  |  |
Listed and emerging stocks |  | $ | 243 |  |  | $ | — |  |  | $ | — |  |  | $ | 243 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 4,169 |  |  |  | 4,169 |
|  | $ | 243 |  |  | $ | — |  |  | $ | 4,169 |  |  | $ | 4,412 |
Hedging financial liabilities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
December 31, 2024
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 661 |  |  |  | 661 |
Limited partnership |  |  | — |  |  |  | — |  |  |  | 307 |  |  |  | 307 |
Other investing agreements |  |  | — |  |  |  | — |  |  |  | 37 |  |  |  | 37 |
|  | $ | — |  |  | $ | — |  |  | $ | 1,005 |  |  | $ | 1,005 |
Financial assets at FVOCI |  |  |  |  |  |  |  |  |  |  |  |
Listed and emerging stocks |  | $ | 126 |  |  | $ | — |  |  | $ | — |  |  | $ | 126 |
Non-listed stocks |  |  | — |  |  |  | — |  |  |  | 4,541 |  |  |  | 4,541 |
|  | $ | 126 |  |  | $ | — |  |  | $ | 4,541 |  |  | $ | 4,667 |
Hedging financial assets |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Hedging financial liabilities |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Schedule of Percentage Decrease in Discount for Lack of Marketability or Noncontrolling Interests |
|  | December 31
|  | 2023 |  | 2024
Discount for lack of marketability |  | 3.75%-20.00% |  | 20.00%-30.00%
Noncontrolling interests discount |  | 17.01%-25.00% |  | 15.00%-29.04%
Growth rate of long-term revenue |  | 0.19% |  | 0.12%
Discount rate |  | 7.11%-8.20% |  | 8.32%-14.40%
Schedule of Impact of Decrease in Discount for Lack of Marketability or Noncontrolling Interests |
|  | December 31 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Discount for lack of marketability |  |  |  |  |  |
5% increase |  | $ | (49 | ) |  | $ | (63 | )
5% decrease |  | $ | 45 |  |  | $ | 63 |
Noncontrolling interests discount |  |  |  |  |  |
5% increase |  | $ | (22 | ) |  | $ | (51 | )
5% decrease |  | $ | 22 |  |  | $ | 51 |
Growth rate of long-term revenue |  |  |  |  |  |
0.1% increase |  | $ | 35 |  |  | $ | 31 |
0.1% decrease |  | $ | (35 | ) |  | $ | (31 | )
Discount rate |  |  |  |  |  |
1% increase |  | $ | (396 | ) |  | $ | (363 | )
1% decrease |  | $ | 488 |  |  | $ | 439 |
Level 3 [Member] |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |
Schedule of Reconciliations for Financial Assets | 2022
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, 2022 |  | $ | 909 |  |  | $ | 3,157 |  |  | $ | 4,066 |
Acquisition |  |  | 348 |  |  |  | 16 |  |  |  | 364 |
Disposal |  |  | — |  |  |  | — |  |  |  | — |
Recognized in profit or loss under “Other gains and losses” |  |  | (215 | ) |  |  | — |  |  |  | (215 | )
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” |  |  | — |  |  |  | 52 |  |  |  | 52 |
Proceeds from capital reduction from investees |  |  | (22 | ) |  |  | (7 | ) |  |  | (29 | )
Balance at December 31, 2022 |  | $ | 1,020 |  |  | $ | 3,218 |  |  | $ | 4,238 |
Unrealized gain or loss in 2022 |  | $ | (209 | ) |  |  |  |  |  |
2023
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, 2023 |  | $ | 1,020 |  |  | $ | 3,218 |  |  | $ | 4,238 |
Acquisition |  |  | 133 |  |  |  | 305 |  |  |  | 438 |
Recognized in profit or loss under “Other gains and losses” |  |  | (95 | ) |  |  | — |  |  |  | (95 | )
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” |  |  | — |  |  |  | 649 |  |  |  | 649 |
Proceeds from capital reduction from investees and profit distribution |  |  | (22 | ) |  |  | (3 | ) |  |  | (25 | )
Balance at December 31, 2023 |  | $ | 1,036 |  |  | $ | 4,169 |  |  | $ | 5,205 |
Unrealized gain or loss in 2023 |  | $ | (95 | ) |  |  |  |  |  |
2024
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, 2024 |  | $ | 1,036 |  |  | $ | 4,169 |  |  | $ | 5,205 |
Acquisition |  |  | 159 |  |  |  | 313 |  |  |  | 472 |
Recognized in profit or loss under “Other gains and losses” |  |  | (147 | ) |  |  | — |  |  |  | (147 | )
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” |  |  | — |  |  |  | 62 |  |  |  | 62 |
Proceeds from capital reduction from investees and profit distribution |  |  | (43 | ) |  |  | (3 | ) |  |  | (46 | )
Balance at December 31, 2024 |  | $ | 1,005 |  |  | $ | 4,541 |  |  | $ | 5,546 |
Unrealized gain or loss in 2024 |  | $ | (143 | ) |  |  |  |  |  |

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