Share-Based Payment Arrangements - Summary of RSAs Measured at Fair Value at Grant Date (Detail) - Restricted Stock Award [Member] $ in Millions |
Mar. 01, 2023
TWD ($)
yr
|
Mar. 01, 2022
TWD ($)
yr
|
|---|---|---|
| Disclosure of terms and conditions of share-based payment arrangement [line items] | ||
| Stock price at measurement date | $ | $ 511 | $ 604 |
| Risk-free interest rate | 1.06% | 0.57% |
| Bottom of range [member] | ||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | ||
| Expected price volatility | 29.34% | 25.34% |
| Expected life | 1 | 1 |
| Top of range [member] | ||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | ||
| Expected price volatility | 32.11% | 28.28% |
| Expected life | 3 | 3 |