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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Equity [abstract]      
Additional paid-in capital $ 24,183.6   $ 24,185.0
From merger 22,803.3   22,804.5
From convertible bonds 8,892.4   8,892.9
From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal 8,406.3   8,406.3
Donations - donated by shareholders 11.3   11.3
From share of changes in equities of subsidiaries 4,229.9   113.9
From share of changes in equities of associates 311.8   307.2
Donations - unclaimed dividend 53.7   40.4
Employee restricted shares 438.0   0.0
Total $ 69,330.3 $ 2,256.1 $ 64,761.5