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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Millions, $ in Millions
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Bonds payable [line items]      
Less: Current portion $ (6,997.7)   $ (18,100.0)
Noncurrent bonds payable 913,899.8 $ 29,846.4 834,336.4
Cost [member] | Taiwan [member]      
Bonds payable [line items]      
Unsecured bonds 447,194.0   379,526.0
Cost [member] | Overseas [member]      
Bonds payable [line items]      
Unsecured bonds 476,578.5   476,051.5
Discounts on bonds payable [member]      
Bonds payable [line items]      
Discounts on bonds payable $ (2,875.0)   $ (3,141.1)