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Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2023
Disclosure of quantitative information about leases for lessee [abstract] |
Summary of Right-of-use Assets | a. Right-of-use assets
|  | December 31 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Land and buildings |  |  |  |  |  |
Handsets base stations |  | $ | 7,175 |  |  | $ | 7,577 |
Others |  |  | 1,727 |  |  |  | 1,754 |
Equipment |  |  | 2,201 |  |  |  | 1,907 |
|  | $ | 11,103 |  |  | $ | 11,238 |
|  | Year Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Additions to right-of-use assets |  | $ | 4,669 |  |  | $ | 4,369 |  |  | $ | 4,415 |
Depreciation charge for right-of-use assets |  |  |  |  |  |  |  |  |
Land and buildings |  |  |  |  |  |  |  |  |
Handsets base stations |  | $ | 2,789 |  |  | $ | 2,863 |  |  | $ | 2,939 |
Others |  |  | 786 |  |  |  | 770 |  |  |  | 787 |
Equipment |  |  | 410 |  |  |  | 349 |  |  |  | 346 |
|  | $ | 3,985 |  |  | $ | 3,982 |  |  | $ | 4,072 |
Summary of Lease Liabilities | b. Lease liabilities
|  | December 31 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Lease liabilities |  |  |  |  |  |
Current |  | $ | 3,339 |  |  | $ | 3,505 |
Noncurrent |  |  | 7,334 |  |  |  | 7,470 |
|  | $ | 10,673 |  |  | $ | 10,975 |
Summary of Range of Discount Rate for Lease Liabilities |
|  | December 31
|  | 2022 |  | 2023
Land and buildings |  |  |  |
Handsets base stations |  | 0.37%-1.71% |  | 0.37%-1.84%
Others |  | 0.37%-9.00% |  | 0.37%-9.00%
Equipment |  | 0.37%-2.99% |  | 0.37%-3.50%
Summary of Total Cash Outflow for Leases | d. Other lease information
|  | Year Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Expenses relating to low-value asset leases |  | $ | 8 |  |  | $ | 9 |  |  | $ | 9 |
Expenses relating to variable lease payments not included in the measurement of lease liabilities |  | $ | 7 |  |  | $ | 8 |  |  | $ | 8 |
Total cash outflow for leases |  | $ | 3,813 |  |  | $ | 3,869 |  |  | $ | 4,006 |

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