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Retirement Benefit Plans - Amounts Arising from Defined Benefit Obligation in Consolidated Statements of Financial Position (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Disclosure of defined benefit plans [abstract]      
Present value of defined benefit obligation $ 17,484.0   $ 16,585.5
Fair value of plan assets (8,162.9)   (5,548.6)
Net defined benefit liability $ 9,321.1 $ 303.3 $ 11,036.9