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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Cash and Cash Equivalents |
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Cash and deposits in banks |  | $ | 551,919.8 |  |  | $ | 575,825.5 |
Repurchase agreements collateralized by corporate bonds |  |  | — |  |  |  | 1,229.6 |
Commercial paper |  |  | 695.9 |  |  |  | 759.5 |
Agency bonds |  |  | 776.0 |  |  |  | — |
|  | $ | 553,391.7 |  |  | $ | 577,814.6 |

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