Equity - Summary of Capital Surplus (Detail) $ in Millions, $ in Millions |
Dec. 31, 2023
TWD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2022
TWD ($)
|
|---|---|---|---|
| Equity [abstract] | |||
| Additional paid-in capital | $ 24,406.8 | $ 24,183.6 | |
| From merger | 22,803.3 | 22,803.3 | |
| From convertible bonds | 8,892.4 | 8,892.4 | |
| From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal | 8,406.3 | 8,406.3 | |
| Donations - donated by shareholders | 11.3 | 11.3 | |
| From share of changes in equities of subsidiaries | 4,199.9 | 4,229.9 | |
| From share of changes in equities of associates | 302.4 | 311.8 | |
| Donations - unclaimed dividend | 70.1 | 53.7 | |
| Employee restricted shares | 783.9 | 438.0 | |
| Total | $ 69,876.4 | $ 2,282.1 | $ 69,330.3 |