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Financial Assets at Fair Value Through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2024
Texts Block [Abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2023 |  |  | December 31, 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  |  |  |  | $ | 79,605.5 |  |  |  |  |  |  |  |  |  |  | $ | 108,612.1 |  |  |  |  |
Agency mortgage-backed securities |  |  |  |  |  |  | 37,959.7 |  |  |  |  |  |  |  |  |  |  |  | 46,611.4 |  |  |  |  |
Government bonds/Agency bonds |  |  |  |  |  |  | 22,338.9 |  |  |  |  |  |  |  |  |  |  |  | 20,645.9 |  |  |  |  |
Asset-backed securities |  |  |  |  |  |  | 9,898.8 |  |  |  |  |  |  |  |  |  |  |  | 11,490.5 |  |  |  |  |
|  |  |  |  |  |  | 149,802.9 |  |  |  |  |  |  |  |  |  |  |  | 187,359.9 |  |  |  |  |
Investments in equity instruments at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  |  |  |  |  | 7,208.7 |  |  |  |  |  |  |  |  |  |  |  | 7,822.9 |  |  |  |  |
Publicly traded stocks |  |  |  |  |  |  | 4,727.9 |  |  |  |  |  |  |  |  |  |  |  | 4,842.8 |  |  |  |  |
|  |  |  |  |  |  | 11,936.6 |  |  |  |  |  |  |  |  |  |  |  | 12,665.7 |  |  |  |  |
|  |  |  |  |  | $ | 161,739.5 |  |  |  |  |  |  |  |  |  |  | $ | 200,025.6 |  |  |  |  |
Current |  |  |  |  |  | $ | 154,530.8 |  |  |  |  |  |  |  |  |  |  | $ | 192,202.7 |  |  |  |  |
Noncurrent |  |  |  |  |  |  | 7,208.7 |  |  |  |  |  |  |  |  |  |  |  | 7,822.9 |  |  |  |  |
|  |  |  |  |  | $ | 161,739.5 |  |  |  |  |  |  |  |  |  |  | $ | 200,025.6 |  |  |  |  |

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