Retirement Benefit Plans - Amounts Arising from Defined Benefit Obligation in Consolidated Statements of Financial Position (Detail) $ in Millions, $ in Millions |
Dec. 31, 2023
TWD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2022
TWD ($)
|
|---|---|---|---|
| Disclosure of defined benefit plans [abstract] | |||
| Present value of defined benefit obligation | $ 17,995.1 | $ 17,484.0 | |
| Fair value of plan assets | (8,737.9) | (8,162.9) | |
| Net defined benefit liability | $ 9,257.2 | $ 302.3 | $ 9,321.1 |