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Bonds Payable (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Bonds Payable [Abstract] |
Summary of Bonds Payable |
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Unsecured domestic bonds |  | $ | — |  |  | $ | 20,000 |
Less: Discounts on bonds payable |  |  | — |  |  |  | (20 | )
|  | $ | — |  |  | $ | 19,980 |
Summary of Major Terms of Unsecured Domestic Bonds Issued | The major terms of unsecured domestic bonds issued by Chunghwa were as follows:
Issuance |  | Tranche |  | Issuance Period |  | Total Amount |  |  | Coupon Rate |  |  | Repayment and Interest Payment
2020-1 |  | A |  | July 2020 to July 2025 |  | $ | 8,800 |  |  | 0.50% |  |  | One-time repayment upon maturity; interest payable annually
|  | B |  | July 2020 to July 2027 |  |  | 7,500 |  |  | 0.54% |  |  | The same as above
|  | C |  | July 2020 to July 2030 |  |  | 3,700 |  |  | 0.59% |  |  | The same as above

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