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Related Parties Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Summary of Related Parties |
| a. | The Company engages in business transactions with the following related parties:
Company |  | Relationship
Taiwan International Standard Electronics Co., Ltd. |  | Associate
So-net Entertainment Taiwan Limited |  | Associate
Skysoft Co., Ltd. |  | Associate
KingwayTek Technology Co., Ltd. |  | Associate
Dian Zuan Integrating Marketing Co., Ltd. |  | Associate
Taiwan International Ports Logistics Corporation |  | Associate
Huada Digital Corporation |  | Joint venture
Chunghwa Benefit One Co., Ltd. |  | Joint venture
International Integrated System, Inc. |  | Associate
Senao Networks, Inc. |  | Associate
EnGenius Tech. Co., Ltd. |  | Associate
HopeTech Technologies Limited |  | Associate
ST-2 Satellite Ventures Pte., Ltd. |  | Associate
Viettel-CHT Co., Ltd. |  | Associate
Click Force Co., Ltd. |  | Associate
Other related parties |  |
Chunghwa Telecom Foundation |  | A nonprofit organization of which the funds donated by Chunghwa exceeds one third of its total funds
Senao Technical and Cultural Foundation |  | A nonprofit organization of which the funds donated by SENAO exceeds one third of its total funds
Sochamp Technology Co., Ltd. |  | Investor of significant influence over CHST
E-Life Mall Co., Ltd. |  | One of the directors of E-Life Mall and a director of SENAO are members of an immediate family
Engenius Technologies Co., Ltd. |  | Chairman of Engenius Technologies Co., Ltd. is a member of SENAO’s management
United Daily News Co., Ltd. |  | Investor of significant influence over SFD
Shenzhen Century Communication Co., Ltd. |  | Investor of significant influence over SCT
Details of Transactions Between the Company and Other Related Parties |
| 1) | Operating transactions
|  | Revenues |
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 333 |  |  | $ | 292 |  |  | $ | 344 |
Joint ventures |  |  | 9 |  |  |  | 7 |  |  |  | 1 |
Others |  |  | 81 |  |  |  | 49 |  |  |  | 65 |
|  | $ | 423 |  |  | $ | 348 |  |  | $ | 410 |
|  | Operating Costs and Expenses |
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 1,451 |  |  | $ | 1,405 |  |  | $ | 1,197 |
Joint ventures |  |  | 17 |  |  |  | 17 |  |  |  | 2 |
Others |  |  | 62 |  |  |  | 74 |  |  |  | 71 |
|  | $ | 1,530 |  |  | $ | 1,496 |  |  | $ | 1,270 |
| 2) | Non-operating transactions
|  | Non-operating Income and Expenses |
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Associates |  | $ | 36 |  |  | $ | 37 |  |  | $ | 32 |
Others |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 36 |  |  | $ | 37 |  |  | $ | 32 |
| 3) | Receivables
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 9 |  |  | $ | 43 |
Joint ventures |  |  | — |  |  |  | — |
Others |  |  | 5 |  |  |  | 6 |
|  | $ | 14 |  |  | $ | 49 |
| 4) | Payables
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 757 |  |  | $ | 680 |
Joint ventures |  |  | 1 |  |  |  | — |
Others |  |  | 4 |  |  |  | 4 |
|  | $ | 762 |  |  | $ | 684 |
| 5) | Customers’ deposits
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 10 |  |  | $ | 6 |
Joint ventures |  |  | 1 |  |  |  | — |
|  | $ | 11 |  |  | $ | 6 |
| 6) | Acquisition of property, plant and equipment
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 314 |  |  | $ | 313 |  |  | $ | 390 |
Joint ventures |  |  | 11 |  |  |  | 7 |  |  |  | — |
|  | $ | 325 |  |  | $ | 320 |  |  | $ | 390 |
The prepaid rents (classified as prepayments) as of December 31, 2016 and 2017, were as follows:
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Prepaid rents - current |  | $ | 204 |  |  | $ | 204 |
Prepaid rents - noncurrent |  |  | 1,755 |  |  |  | 1,551 |
|  | $ | 1,959 |  |  | $ | 1,755 |
Compensation of Directors and Other Key Management Personnel |
| c. | Compensation of key management personnel
The compensation of directors and other key management personnel for the years ended December 31, 2015, 2016 and 2017 were as follows:
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Short-term employee benefits |  | $ | 212 |  |  | $ | 251 |  |  | $ | 254 |
Post-employment benefits |  |  | 9 |  |  |  | 8 |  |  |  | 9 |
Share-based payment |  |  | 3 |  |  |  | 2 |  |  |  | 2 |
|  | $ | 224 |  |  | $ | 261 |  |  | $ | 265 |

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