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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Bonds payable [line items]      
Less: Current portion $ (31,800.0)   $ (34,900.0)
Noncurrent bonds payable 25,100.0 $ 839.2 56,900.0
Cost [member] | Taiwan [member]      
Bonds payable [line items]      
Unsecured bonds $ 56,900.0   $ 91,800.0