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Related Parties Transactions (Tables) | 12 Months Ended
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Dec. 31, 2019
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
KKBOX Taiwan Co., Ltd. |  | Associate
KingwayTek Technology Co., Ltd. |  | Associate
UUPON Inc. |  | 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
EnRack Technology Inc. |  | Subsidiary of the Company’s associate, Senao Networks, Inc.
Emplus Technologies, Inc. |  | Subsidiary of the Company’s associate, Senao Networks, Inc.
ST-2 Satellite Ventures Pte., Ltd. |  | Associate
Viettel-CHT Co., Ltd. |  | Associate
Click Force Co., Ltd. |  | Associate
Alliance Digital Tech Co., Ltd. |  | Associate
MeWorks Limited（HK） |  | Associate
Chunghwa PChome Fund I Co., Ltd. (“CPFI”) |  | Associate
Cornerstone Ventures Co., Ltd. (“CVC”) |  | Associate
Next Commercial Bank Co., Ltd. (preparatory office) (“NCB”) |  | 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
Cheng Keng Investment Co., Ltd. |  | Chairman of Cheng Keng Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Cheng Feng Investment Co., Ltd. |  | Chairman of Cheng Feng Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
All Oriented Investment Co., Ltd. |  | Chairman of All Oriented Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Hwa Shun Investment Co., Ltd. |  | Chairman of Hwa Shun Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Yu Yu Investment Co., Ltd. |  | Chairman of Yu Yu Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
United Daily News Co., Ltd. |  | Investor of significant influence over SFD
Shenzhen Century Communication Co., Ltd. |  | Investor of significant influence over SCT
| 1) | Operating transactions
|  | Revenues |
|  | Year Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 344 |  |  | $ | 344 |  |  | $ | 274 |
Joint ventures |  |  | 1 |  |  |  | — |  |  |  | — |
Others |  |  | 65 |  |  |  | 94 |  |  |  | 76 |
|  | $ | 410 |  |  | $ | 438 |  |  | $ | 350 |
|  | Operating Costs and Expenses |
|  | Year Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 1,197 |  |  | $ | 1,304 |  |  | $ | 964 |
Joint ventures |  |  | 2 |  |  |  | — |  |  |  | — |
Others |  |  | 71 |  |  |  | 75 |  |  |  | 76 |
|  | $ | 1,270 |  |  | $ | 1,379 |  |  | $ | 1,040 |
| 2) | Non-operating transactions
|  | Non-operating Income and Expenses |
|  | Year Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Associates |  | $ | 32 |  |  | $ | 31 |  |  | $ | 41 |
Others |  |  | — |  |  |  | — |  |  |  | 4 |
|  | $ | 32 |  |  | $ | 31 |  |  | $ | 45 |
| 3) | Receivables
|  | December 31 |
|  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 11 |  |  | $ | 10 |
Others |  |  | 13 |  |  |  | 7 |
|  | $ | 24 |  |  | $ | 17 |
| 4) | Payables
|  | December 31 |
|  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 914 |  |  | $ | 651 |
Others |  |  | 4 |  |  |  | 3 |
|  | $ | 918 |  |  | $ | 654 |
| 5) | Customers’ deposits
|  | December 31 |
|  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 6 |  |  | $ | 8 |
| 6) | Acquisition of property, plant and equipment
|  | Year Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 390 |  |  | $ | 312 |  |  | $ | 242 |
Joint ventures |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 390 |  |  | $ | 312 |  |  | $ | 242 |
The prepaid rents (classified as prepayments) as of December 31, 2018, was as follows:
|  | December 31, |
|  | 2018 |
|  | NT$ |
|  | (In Millions) |
Prepaid rents - current |  | $ | 205 |
Prepaid rents - noncurrent |  |  | 1,346 |
|  | $ | 1,551 |
Summary of Lease Liabilities | The lease liabilities of ST-2 Satellite Ventures Pte., Ltd. as of December 31, 2019 was as follows:
|  | December 31, |
|  | 2019 |
|  | NT$ |
|  | (In Millions) |
Lease liabilities - current |  | $ | 188 |
Lease liabilities - noncurrent |  |  | 1,024 |
|  | $ | 1,212 |
Compensation of Directors and Other Key Management Personnel | The compensation of directors and other key management personnel for the years ended December 31, 2017, 2018 and 2019 were as follows:
|  | Year Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Short-term employee benefits |  | $ | 254 |  |  | $ | 282 |  |  | $ | 263 |
Post-employment benefits |  |  | 9 |  |  |  | 10 |  |  |  | 9 |
Share-based payment |  |  | 2 |  |  |  | 9 |  |  |  | - |
|  | $ | 265 |  |  | $ | 301 |  |  | $ | 272 |

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