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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue [Abstract] |
Summary of Revenue |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Revenue from contracts with customers |  | $ | 214,461 |  |  | $ | 206,360 |  |  | $ | 206,396 |
Other revenues |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  | 640 |  |  |  | 818 |  |  |  | 843 |
Others |  |  | 382 |  |  |  | 342 |  |  |  | 370 |
|  |  | 1,022 |  |  |  | 1,160 |  |  |  | 1,213 |
Total |  | $ | 215,483 |  |  | $ | 207,520 |  |  | $ | 207,609 |
Summary of Disaggregation of Revenue |
| a. | Disaggregation of revenue
2018
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Main Products and Service Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mobile services revenue |  | $ | — |  |  | $ | 63,906 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 63,906 |
Sales of products |  |  | 1,731 |  |  |  | 35,702 |  |  |  | 4 |  |  |  | 251 |  |  |  | 3,601 |  |  |  | 41,289 |
Local telephone and domestic long distance telephone services revenue |  |  | 29,996 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 29,996 |
Broadband access and domestic leased line services revenue |  |  | 22,453 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22,453 |
Data Communications internet services revenue |  |  | — |  |  |  | — |  |  |  | 21,137 |  |  |  | — |  |  |  | — |  |  |  | 21,137 |
International network and leased line services revenue |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,724 |  |  |  | — |  |  |  | 8,724 |
Others |  |  | 11,923 |  |  |  | 1,269 |  |  |  | 8,509 |  |  |  | 4,449 |  |  |  | 806 |  |  |  | 26,956 |
|  | $ | 66,103 |  |  | $ | 100,877 |  |  | $ | 29,650 |  |  | $ | 13,424 |  |  | $ | 4,407 |  |  | $ | 214,461 |
2019
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Main Products and Service Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mobile services revenue |  | $ | — |  |  | $ | 58,703 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 58,703 |
Sales of products |  |  | 1,957 |  |  |  | 35,545 |  |  |  | 41 |  |  |  | 265 |  |  |  | 3,785 |  |  |  | 41,593 |
Local telephone and domestic long distance telephone services revenue |  |  | 27,929 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 27,929 |
Broadband access and domestic leased line services revenue |  |  | 22,116 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22,116 |
Data Communications internet services revenue |  |  | — |  |  |  | — |  |  |  | 21,003 |  |  |  | — |  |  |  | — |  |  |  | 21,003 |
International network and leased line services revenue |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,066 |  |  |  | — |  |  |  | 7,066 |
Others |  |  | 13,064 |  |  |  | 1,142 |  |  |  | 8,790 |  |  |  | 4,144 |  |  |  | 810 |  |  |  | 27,950 |
|  | $ | 65,066 |  |  | $ | 95,390 |  |  | $ | 29,834 |  |  | $ | 11,475 |  |  | $ | 4,595 |  |  | $ | 206,360 |
2020
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Main Products and Service Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mobile services revenue |  | $ | — |  |  | $ | 56,724 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 56,724 |
Sales of products |  |  | 2,214 |  |  |  | 32,112 |  |  |  | 107 |  |  |  | 313 |  |  |  | 4,645 |  |  |  | 39,391 |
Local telephone and domestic long distance telephone services revenue |  |  | 26,475 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 26,475 |
Broadband access and domestic leased line services revenue |  |  | 22,420 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22,420 |
Data Communications internet services revenue |  |  | — |  |  |  | — |  |  |  | 21,447 |  |  |  | — |  |  |  | — |  |  |  | 21,447 |
International network and leased line services revenue |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,884 |  |  |  | — |  |  |  | 3,884 |
Others |  |  | 17,695 |  |  |  | 1,307 |  |  |  | 10,255 |  |  |  | 4,485 |  |  |  | 2,313 |  |  |  | 36,055 |
|  | $ | 68,804 |  |  | $ | 90,143 |  |  | $ | 31,809 |  |  | $ | 8,682 |  |  | $ | 6,958 |  |  | $ | 206,396 |
Summary of Contract Balances |
| b. | Contract balances
|  | January 1 |  |  | December 31 |
|  | 2019 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Trade notes and accounts receivable (Note 10) |  | $ | 30,076 |  |  | $ | 26,408 |  |  | $ | 22,622 |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |
Products and service bundling |  | $ | 7,123 |  |  | $ | 6,943 |  |  | $ | 7,232 |
Others |  |  | 109 |  |  |  | 116 |  |  |  | 612 |
Less : Loss allowance |  |  | (19 | ) |  |  | (17 | ) |  |  | (18 | )
|  | $ | 7,213 |  |  | $ | 7,042 |  |  | $ | 7,826 |
Current |  | $ | 4,869 |  |  | $ | 4,441 |  |  | $ | 5,331 |
Noncurrent |  |  | 2,344 |  |  |  | 2,601 |  |  |  | 2,495 |
|  | $ | 7,213 |  |  | $ | 7,042 |  |  | $ | 7,826 |
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |
Telecommunications business |  | $ | 8,193 |  |  | $ | 12,772 |  |  | $ | 13,602 |
Project business |  |  | 4,508 |  |  |  | 10,360 |  |  |  | 6,687 |
Products and service bundling |  |  | 106 |  |  |  | 39 |  |  |  | 16 |
Others |  |  | 476 |  |  |  | 510 |  |  |  | 421 |
|  | $ | 13,283 |  |  | $ | 23,681 |  |  | $ | 20,726 |
Current |  | $ | 10,688 |  |  | $ | 16,840 |  |  | $ | 13,437 |
Noncurrent |  |  | 2,595 |  |  |  | 6,841 |  |  |  | 7,289 |
|  | $ | 13,283 |  |  | $ | 23,681 |  |  | $ | 20,726 |
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 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |
Net increase of customer contracts |  | $ | 4,126 |  |  | $ | 6,066 |  |  | $ | 5,972 |
Reclassified to trade receivables |  |  | (7,532 | ) |  |  | (6,405 | ) |  |  | (5,681 | )
|  | $ | (3,406 | ) |  | $ | (339 | ) |  | $ | 291 |
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |
Net increase of customer contracts |  | $ | 16 |  |  | $ | 22 |  |  | $ | 7 |
Recognized as revenues |  |  | (194 | ) |  |  | (89 | ) |  |  | (30 | )
|  | $ | (178 | ) |  | $ | (67 | ) |  | $ | (23 | )
Summary of Revenue Recognized | Revenue recognized for the period that was included in the contract liability at the beginning of the year was as follows:
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Telecommunications business |  | $ | 7,157 |  |  | $ | 6,186 |  |  | $ | 5,492 |
Project business |  |  | 627 |  |  |  | 3,973 |  |  |  | 6,092 |
Others |  |  | 324 |  |  |  | 404 |  |  |  | 512 |
|  | $ | 8,108 |  |  | $ | 10,563 |  |  | $ | 12,096 |
Summary of Incremental Costs of Obtaining Contracts |
| c. | Incremental costs of obtaining contracts
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Noncurrent |  |  |  |  |  |  |  |
Incremental costs of obtaining contracts |  | $ | 943 |  |  | $ | 1,000 |

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