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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
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 121.5   118.8
From share of changes in equities of associates 282.8   289.2
Donations 29.3   19.2
Total $ 56,316.0 $ 1,839.8 $ 56,309.6