Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions |
Dec. 31, 2023
TWD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2022
TWD ($)
|
Dec. 31, 2021
TWD ($)
|
Dec. 31, 2020
TWD ($)
|
|---|---|---|---|---|---|
| Disclosure of financial assets [line items] | |||||
| Corporate bonds | $ 145,960.6 | $ 129,727.4 | |||
| Less: Allowance for impairment loss | (531.5) | (331.6) | $ (347.0) | $ (246.6) | |
| Current portion | 66,761.2 | $ 2,180.3 | 94,600.2 | ||
| Noncurrent portion | 79,199.4 | $ 2,586.5 | 35,127.2 | ||
| Corporate bonds [member] | |||||
| Disclosure of financial assets [line items] | |||||
| Corporate bonds | 113,851.9 | 81,041.0 | |||
| Less: Allowance for impairment loss | (82.7) | (56.4) | |||
| Commercial paper [member] | |||||
| Disclosure of financial assets [line items] | |||||
| Debt instruments held | 18,387.9 | 48,742.8 | |||
| Government bonds/Agency bonds [member] | |||||
| Disclosure of financial assets [line items] | |||||
| Debt instruments held | $ 13,803.5 | $ 0.0 |