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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Bonds payable [line items]      
Less: Current portion $ (18,100.0)   $ (4,400.0)
Noncurrent bonds payable 834,336.4 $ 27,150.4 610,070.6
Cost [member] | Taiwan [member]      
Bonds payable [line items]      
Unsecured bonds 379,526.0   312,448.0
Cost [member] | Overseas [member]      
Bonds payable [line items]      
Unsecured bonds 476,051.5   304,414.0
Discounts on bonds payable [member]      
Bonds payable [line items]      
Discounts on bonds payable $ (3,141.1)   $ (2,391.4)