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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue [abstract] |
Summary of Revenue |
|  | Year Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Revenue from contracts with customers |  | $ | 214,498 |  |  | $ | 220,190 |  |  | $ | 227,185 |
Other revenues |  |  |  |  |  |  |  |  |
Government grants income |  |  | 1,030 |  |  |  | 1,704 |  |  |  | 1,393 |
Rental income |  |  | 1,022 |  |  |  | 1,120 |  |  |  | 1,196 |
Others |  |  | 189 |  |  |  | 185 |  |  |  | 194 |
|  |  | 2,241 |  |  |  | 3,009 |  |  |  | 2,783 |
Total |  | $ | 216,739 |  |  | $ | 223,199 |  |  | $ | 229,968 |
Summary of Contract Balances | b. Contract balances
|  | January 1, |  |  | December 31 |
|  | 2023 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Trade notes and accounts receivable (Note 11) |  | $ | 24,672 |  |  | $ | 24,842 |  |  | $ | 26,026 |
Contract assets |  |  |  |  |  |  |  |  |
Products and service bundling |  | $ | 7,956 |  |  | $ | 9,297 |  |  | $ | 10,446 |
Others |  |  | 1,256 |  |  |  | 1,206 |  |  |  | 2,306 |
Less : Loss allowance |  |  | (19 | ) |  |  | (21 | ) |  |  | (24 | )
|  | $ | 9,193 |  |  | $ | 10,482 |  |  | $ | 12,728 |
Current |  | $ | 6,056 |  |  | $ | 6,713 |  |  | $ | 8,401 |
Noncurrent |  |  | 3,137 |  |  |  | 3,769 |  |  |  | 4,327 |
|  | $ | 9,193 |  |  | $ | 10,482 |  |  | $ | 12,728 |
Contract liabilities |  |  |  |  |  |  |  |  |
Telecommunications business |  | $ | 14,081 |  |  | $ | 14,016 |  |  | $ | 13,931 |
Project business |  |  | 6,586 |  |  |  | 6,654 |  |  |  | 8,015 |
Advance house and land receipts (Notes 12 and 42) |  |  | — |  |  |  | 460 |  |  |  | 1,064 |
Others |  |  | 397 |  |  |  | 518 |  |  |  | 832 |
|  | $ | 21,064 |  |  | $ | 21,648 |  |  | $ | 23,842 |
Current |  | $ | 13,390 |  |  | $ | 14,088 |  |  | $ | 16,301 |
Noncurrent |  |  | 7,674 |  |  |  | 7,560 |  |  |  | 7,541 |
|  | $ | 21,064 |  |  | $ | 21,648 |  |  | $ | 23,842 |
Summary of Changes in Contract Assets and Contract Liabilities | Significant changes of contract assets and liabilities recognized resulting from product and service bundling were as follows:
|  | Year Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Contract assets |  |  |  |  |  |  |  |  |
Net increase of customer contracts |  | $ | 6,933 |  |  | $ | 7,961 |  |  | $ | 8,617 |
Reclassified to trade receivables |  |  | (6,149 | ) |  |  | (6,574 | ) |  |  | (7,443 | )
|  | $ | 784 |  |  | $ | 1,387 |  |  | $ | 1,174 |
Contract liabilities |  |  |  |  |  |  |  |  |
Net increase of customer contracts |  | $ | 9 |  |  | $ | 187 |  |  | $ | 197 |
Recognized as revenues |  |  | (5 | ) |  |  | (173 | ) |  |  | (184 | )
|  | $ | 4 |  |  | $ | 14 |  |  | $ | 13 |
Summary of Revenue Recognized | Revenue recognized for the year that was included in the contract liability at the beginning of the year was as follows:
|  | Year Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Telecommunications business |  | $ | 6,626 |  |  | $ | 6,660 |  |  | $ | 6,721 |
Project business |  |  | 4,067 |  |  |  | 5,290 |  |  |  | 4,474 |
Others |  |  | 440 |  |  |  | 540 |  |  |  | 459 |
|  | $ | 11,133 |  |  | $ | 12,490 |  |  | $ | 11,654 |
Summary of Incremental Costs of Obtaining Contracts | c. Incremental costs of obtaining contracts
|  | December 31 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Current |  |  |  |  |  |
Incremental costs of obtaining contracts |  | $ | 211 |  |  | $ | 339 |
Noncurrent |  |  |  |  |  |
Incremental costs of obtaining contracts |  | $ | 939 |  |  | $ | 1,222 |

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