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Financial Assets at Fair Value Through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2022
Text Block [Abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2021 |  |  | December 31, 2022 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 57,253.2 |  |  | $ | 66,116.2 |
Agency bonds/Agency mortgage-backed securities |  |  | 32,070.1 |  |  |  | 28,399.9 |
Government bonds |  |  | 21,345.8 |  |  |  | 18,929.8 |
Asset-backed securities |  |  | 8,660.4 |  |  |  | 9,274.7 |
|  |  | 119,329.5 |  |  |  | 122,720.6 |
Investments in equity instruments at FVTOCI |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  | 5,887.9 |  |  |  | 6,159.2 |
Publicly traded stocks |  |  | 189.8 |  |  |  | 277.9 |
|  |  | 6,077.7 |  |  |  | 6,437.1 |
|  | $ | 125,407.2 |  |  | $ | 129,157.7 |
Current |  | $ | 119,519.3 |  |  | $ | 122,998.5 |
Noncurrent |  |  | 5,887.9 |  |  |  | 6,159.2 |
|  | $ | 125,407.2 |  |  | $ | 129,157.7 |

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