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Fair Value Information - Schedule of Reconciliations for Financial Assets (Detail) - Level 3 [Member] - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | $ 5,205 | $ 4,238 | $ 4,066
Acquisition | 472 | 438 | 364
Disposal |  |  | 0
Recognized in profit or loss under “Other gains and losses” | (147) | (95) | (215)
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” | 62 | 649 | 52
Proceeds from capital reduction of the investees | (46) | (25) | (29)
Ending Balance | 5,546 | 5,205 | 4,238
Measured at Fair Value Through Profit or Loss [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | 1,036 | 1,020 | 909
Acquisition | 159 | 133 | 348
Disposal |  |  | 0
Recognized in profit or loss under “Other gains and losses” | (147) | (95) | (215)
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” | 0 | 0 | 0
Proceeds from capital reduction of the investees | (43) | (22) | (22)
Ending Balance | 1,005 | 1,036 | 1,020
Unrealized gain or loss | (143) | (95) | (209)
Measured at FVOCI [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | 4,169 | 3,218 | 3,157
Acquisition | 313 | 305 | 16
Disposal |  |  | 0
Recognized in profit or loss under “Other gains and losses” | 0 | 0 | 0
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” | 62 | 649 | 52
Proceeds from capital reduction of the investees | (3) | (3) | (7)
Ending Balance | $ 4,541 | $ 4,169 | $ 3,218

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