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Financial Assets at Fair Value Through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 51,790.0 |  |  | $ | 56,593.6 |
Agency bonds/Agency mortgage-backed securities |  |  | 51,966.5 |  |  |  | 43,977.1 |
Government bonds |  |  | 12,824.2 |  |  |  | 13,459.5 |
Asset-backed securities |  |  | 10,815.9 |  |  |  | 8,368.3 |
|  |  | 127,396.6 |  |  |  | 122,398.5 |
Investments in equity instruments at FVTOCI |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  | 4,124.3 |  |  |  | 4,514.9 |
Publicly traded stocks |  |  | — |  |  |  | 50.0 |
|  |  | 4,124.3 |  |  |  | 4,564.9 |
|  | $ | 131,520.9 |  |  | $ | 126,963.4 |
Current |  | $ | 127,396.6 |  |  | $ | 122,448.5 |
Noncurrent |  |  | 4,124.3 |  |  |  | 4,514.9 |
|  | $ | 131,520.9 |  |  | $ | 126,963.4 |

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