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Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Quantitative Information About Leases For Lessee [Abstract] |
Summary of Right-of-use Assets | a.Right-of-use Assets
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Land and buildings |  |  |  |  |  |  |  |
Handsets base stations |  | $ | 6,845 |  |  | $ | 7,096 |
Others |  |  | 1,916 |  |  |  | 1,708 |
Equipment |  |  | 2,603 |  |  |  | 2,205 |
|  | $ | 11,364 |  |  | $ | 11,009 |
|  | Year Ended December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Additions to right-of-use assets |  | $ | 3,803 |  |  | $ | 3,796 |
Depreciation charge for right-of-use assets |  |  |  |  |  |  |  |
Land and buildings |  |  |  |  |  |  |  |
Handsets base stations |  | $ | 2,728 |  |  | $ | 2,729 |
Others |  |  | 821 |  |  |  | 786 |
Equipment |  |  | 419 |  |  |  | 416 |
|  | $ | 3,968 |  |  | $ | 3,931 |
Summary of Lease Liabilities | b.Lease liabilities
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Lease liabilities |  |  |  |  |  |  |  |
Current |  | $ | 3,291 |  |  | $ | 3,382 |
Noncurrent |  |  | 6,467 |  |  |  | 6,215 |
|  | $ | 9,758 |  |  | $ | 9,597 |
Summary of Range of Discount Rate for Lease Liabilities | Ranges of discount rates for lease liabilities were as follows:
|  | December 31
|  | 2019 |  | 2020
Land and buildings |  |  |  |
Handsets base stations |  | 0.58%-1.18% |  | 0.46%-1.18%
Others |  | 0.58%-9.00% |  | 0.46%-9.00%
Equipment |  | 0.58%-4.50% |  | 0.46%-2.99%
Summary of Total Cash Outflow for Leases | d.Other lease information
|  | Year Ended December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Expenses relating to low-value asset leases |  | $ | 7 |  |  | $ | 8 |
Expenses relating to variable lease payments not included in the measurement of lease liabilities |  | $ | 6 |  |  | $ | 5 |
Total cash outflow for leases |  | $ | 3,826 |  |  | $ | 3,776 |

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- Definition The disclosure of additional information about leasing activities of a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 59 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_59&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of quantitative information about right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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