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Financial Assets at Fair Value Through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Text Block [Abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2022 |  |  | December 31, 2023 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  |  |  |  | $ | 66,116.2 |  |  |  |  |  |  |  |  |  |  | $ | 79,605.5 |  |  |  |  |
Agency mortgage-backed securities |  |  |  |  |  |  | 28,367.9 |  |  |  |  |  |  |  |  |  |  |  | 37,959.7 |  |  |  |  |
Government bonds/Agency bonds |  |  |  |  |  |  | 18,961.8 |  |  |  |  |  |  |  |  |  |  |  | 22,338.9 |  |  |  |  |
Asset-backed securities |  |  |  |  |  |  | 9,274.7 |  |  |  |  |  |  |  |  |  |  |  | 9,898.8 |  |  |  |  |
|  |  |  |  |  |  | 122,720.6 |  |  |  |  |  |  |  |  |  |  |  | 149,802.9 |  |  |  |  |
Investments in equity instruments at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  |  |  |  |  | 6,159.2 |  |  |  |  |  |  |  |  |  |  |  | 7,208.7 |  |  |  |  |
Publicly traded stocks |  |  |  |  |  |  | 277.9 |  |  |  |  |  |  |  |  |  |  |  | 4,727.9 |  |  |  |  |
|  |  |  |  |  |  | 6,437.1 |  |  |  |  |  |  |  |  |  |  |  | 11,936.6 |  |  |  |  |
|  |  |  |  |  | $ | 129,157.7 |  |  |  |  |  |  |  |  |  |  | $ | 161,739.5 |  |  |  |  |
Current |  |  |  |  |  | $ | 122,998.5 |  |  |  |  |  |  |  |  |  |  | $ | 154,530.8 |  |  |  |  |
Noncurrent |  |  |  |  |  |  | 6,159.2 |  |  |  |  |  |  |  |  |  |  |  | 7,208.7 |  |  |  |  |
|  |  |  |  |  | $ | 129,157.7 |  |  |  |  |  |  |  |  |  |  | $ | 161,739.5 |  |  |  |  |

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