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Equity - Summary of Capital Surplus (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
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 118.8   107.8
From share of changes in equities of associates 289.2   282.1
Donations 19.2    
Total $ 56,309.6 $ 1,899.8 $ 56,272.3