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Equity - Noncontrolling Interests (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Beginning balance $ 392,719   $ 391,529 $ 389,130
Profit attributable to noncontrolling interests 1,319 $ 40 1,103 1,511
Income tax relating to remeasurements of defined benefit pension plans (451)   (31) (231)
Cash dividends distributed by subsidiaries (898)   (1,092) (1,053)
Ending balance 395,806 12,071 392,719 391,529
Noncontrolling interests [Member]        
Beginning balance 12,432   12,408 11,747
Profit attributable to noncontrolling interests 1,319   1,103 1,511
Exchange differences arising from the translation of the foreign operations 12   2 21
Unrealized gain or loss on financial assets at FVOCI 4   (22) (25)
Remeasurements of defined benefit pension plans 18   12 24
Income tax relating to remeasurements of defined benefit pension plans (4)   (2) (5)
Share of other comprehensive income (loss) of associates and joint ventures 17   (21) 5
Cash dividends distributed by subsidiaries (898)   (1,092) (1,053)
Actual acquisition or disposal of interests in subsidiaries 35   0 0
Net increase in noncontrolling interests 45   44 183
Ending balance $ 12,980 $ 396 $ 12,432 $ 12,408