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Financial Assets at Fair Value Through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2018 |  |  | December 31, 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Investments in debt instruments at FVTOCI |  |  |  |  |  |  |  |
Agency bonds/Agency mortgage-backed securities |  | $ | 31,288.8 |  |  | $ | 51,966.5 |
Corporate bond s |  |  | 40,753.6 |  |  |  | 51,790.0 |
Government bonds |  |  | 11,151.3 |  |  |  | 12,824.2 |
Asset-backed securities |  |  | 15,670.3 |  |  |  | 10,815.9 |
Commercial paper |  |  | 107.6 |  |  |  | — |
|  |  | 98,971.6 |  |  |  | 127,396.6 |
Investments in equity instruments at FVTOCI |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  | 3,910.7 |  |  |  | 4,124.3 |
Publicly traded stocks |  |  | 590.1 |  |  |  | — |
|  |  | 4,500.8 |  |  |  | 4,124.3 |
|  | $ | 103,472.4 |  |  | $ | 131,520.9 |
Current |  | $ | 99,561.7 |  |  | $ | 127,396.6 |
Noncurrent |  |  | 3,910.7 |  |  |  | 4,124.3 |
|  | $ | 103,472.4 |  |  | $ | 131,520.9 |

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