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Equity - Appropriations of Earnings (Detail) - TWD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash dividends [Member]      
Appropriations of earnings $ 38,787 $ 36,910 $ 36,476
Cash dividends per share $ 5 $ 4.758 $ 4.702
Reversal of Special Reserve [Member]      
Appropriations of earnings   $ (223) $ (185)