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Fair Value Information - Schedule of Reconciliations for Financial Assets (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Reclassified to investment accounted for using equity method | $ 0 | $ 0 | $ 64
Level 3 [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | 4,238 | 4,066 | 5,116
Acquisition | 438 | 364 | 106
Disposal |  | 0 | (5)
Reclassified to investment accounted for using equity method |  |  | (64)
Recognized in profit or loss under “Other gains and losses” | (95) | (215) | 251
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” | 649 | 52 | (1,294)
Proceeds from capital reduction of the investees | (25) | (29) | (44)
Ending Balance | 5,205 | 4,238 | 4,066
Level 3 [Member] | Measured at Fair Value Through Profit or Loss [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | 1,020 | 909 | 677
Acquisition | 133 | 348 | 25
Disposal |  | 0 | 0
Reclassified to investment accounted for using equity method |  |  | 0
Recognized in profit or loss under “Other gains and losses” | (95) | (215) | 251
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 | (22) | (22) | (44)
Ending Balance | 1,036 | 1,020 | 909
Unrealized gain or loss | (95) | (209) | 232
Level 3 [Member] | Measured at FVOCI [Member] |  |  |
Disclosure Of Fair Value Measurement Of Assets [Line Items] |  |  |
Beginning Balance | 3,218 | 3,157 | 4,439
Acquisition | 305 | 16 | 81
Disposal |  | 0 | (5)
Reclassified to investment accounted for using equity method |  |  | (64)
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” | 649 | 52 | (1,294)
Proceeds from capital reduction of the investees | (3) | (7) | 0
Ending Balance | $ 4,169 | $ 3,218 | $ 3,157

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