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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