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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Equity [abstract]      
Additional paid-in capital $ 24,809.7   $ 24,406.8
From merger 22,800.4   22,803.3
From convertible bonds 8,891.3   8,892.4
From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal 8,411.6   8,406.3
Donations - donated by shareholders 11.3   11.3
From share of changes in equities of subsidiaries 4,108.9   4,199.9
From share of changes in equities of associates 1,172.4   302.4
Donations - unclaimed dividend 79.0   70.1
Employee restricted shares 2,976.2   783.9
Total $ 73,260.8 $ 2,234.2 $ 69,876.4