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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Summary of Cash and Cash Equivalents |
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Cash and deposits in banks |  | $ | 452,734.4 |  |  | $ | 653,580.6 |
Government bonds |  |  | 2,188.1 |  |  |  | 3,716.1 |
Repurchase agreements |  |  | — |  |  |  | 1,750.4 |
Commercial paper |  |  | 476.8 |  |  |  | 1,123.5 |
|  | $ | 455,399.3 |  |  | $ | 660,170.6 |

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