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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Equity [abstract]      
Additional paid-in capital $ 24,185.0   $ 24,185.0
From merger 22,804.5   22,804.5
From convertible bonds 8,892.9   8,892.9
From share of changes in equities of subsidiaries 121.8   121.8
From share of changes in equities of associates 302.5   302.2
Donations 40.5   33.3
Total $ 56,347.2 $ 2,006.7 $ 56,339.7