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Other Current Monetary Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Other Current Monetary Assets [Abstract] |
Summary of Other Current Monetary Assets |
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | $ | 5,959 |  |  | $ | 4,596 |
Repurchase agreements collateralized by bonds with maturities of more than three months |  |  | 15 |  |  |  | — |
Others |  |  | 1,524 |  |  |  | 1,528 |
|  | $ | 7,498 |  |  | $ | 6,124 |
Annual Yield Rates of Time Deposits, Negotiable Certificates of Deposits and Repurchase Agreements Collateralized by Bonds with Maturities of more Than Three Months | The annual yield rates of time deposits, negotiable certificates of deposit and repurchase agreements collateralized by bonds with maturities of more than three months at the balance sheet dates were as follows:
|  | December 31 |
|  | 2019 |  |  | 2020 |
Time deposits and negotiable certificates of deposit with maturities of more than three months |  | 0.03%-2.73% |  |  | 0.07%-2.25% |
Repurchase agreements collateralized by bonds with maturities of more than three months |  | 2.50% |  |  |  | — |

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