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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Jun. 30, 2020
TWD ($)
Equity [abstract]        
Additional paid-in capital $ 24,185.0   $ 24,185.0 $ 24,185.0
From merger 22,804.5   22,804.5 22,804.5
From convertible bonds 8,892.9   8,892.9 8,892.9
From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal 8,406.3      
From share of changes in equities of subsidiaries 121.8   121.8 121.8
From share of changes in equities of associates 302.8   302.5 302.5
Donations 40.5   40.5 33.3
Total $ 64,753.8 $ 2,320.1 $ 56,347.2 $ 56,340.0