Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Disclosure of detailed information about financial instruments [line items] | ||
| Lease liabilities | $ 21,754.4 | $ 22,589.1 |
| 5-10 years [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Lease liabilities | 10,197.5 | 10,241.7 |
| 10-15 years [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Lease liabilities | 7,121.6 | 7,329.0 |
| 15-20 years [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Lease liabilities | 4,117.1 | 4,233.9 |
| More than 20 years [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Lease liabilities | $ 318.2 | $ 784.5 |