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Related Parties Transactions (Tables) | 12 Months Ended
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Dec. 31, 2020
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 (Note 2)
Taiwan International Ports Logistics Corporation |  | Associate
International Integrated Systems, Inc. |  | Subsidiary (Note 1)
Senao Networks, Inc. |  | Associate
EnRack Tech. Co., Ltd. |  | 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
Chunghwa PChome Fund I Co., Ltd. |  | Associate
Cornerstone Ventures Co., Ltd. |  | Associate
Next Commercial Bank Co., Ltd. |  | Associate
Chunghwa SEA Holdings |  | Joint venture
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
Company |  | Relationship
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
Chunghwa Post Co., Ltd. |  | Government-related entity as Chunghwa Telecom
Note 1: IISI was an associate and has become a subsidiary starting from July 1, 2020. Please refer to Note 14 (c). All transactions between the Company were eliminated upon consolidation since the acquisition date. Note 2: UUPON was previously an associate. As the Company did not participate in the capital increase of UUPON in October 2020; therefore, the Company lost its significant influence over UUPON. Since then, UUPON was no longer a related party of the Company. Please refer to Note 15.
| 1) | Operating transactions
|  | Revenues |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 344 |  |  | $ | 274 |  |  | $ | 1,508 |
Others |  |  | 94 |  |  |  | 76 |  |  |  | 66 |
|  | $ | 438 |  |  | $ | 350 |  |  | $ | 1,574 |
|  | Operating Costs and Expenses |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 1,304 |  |  | $ | 964 |  |  | $ | 715 |
Others |  |  | 75 |  |  |  | 76 |  |  |  | 68 |
|  | $ | 1,379 |  |  | $ | 1,040 |  |  | $ | 783 |
| 2) | Non-operating transactions
|  | Non-operating Income and Expenses |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Associates |  | $ | 31 |  |  | $ | 41 |  |  | $ | 37 |
Others |  |  | — |  |  |  | 4 |  |  |  | 3 |
|  | $ | 31 |  |  | $ | 45 |  |  | $ | 40 |
| 3) | Receivables
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 10 |  |  | $ | 229 |
Others |  |  | 7 |  |  |  | 1 |
|  | $ | 17 |  |  | $ | 230 |
| 4) | Contract liabilities-current
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | — |  |  | $ | 183 |
| 5) | Payables
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 651 |  |  | $ | 643 |
Others |  |  | 3 |  |  |  | 3 |
|  | $ | 654 |  |  | $ | 646 |
| 6) | Customers’ deposits
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 8 |  |  | $ | 5 |
| 7) | Acquisition of property, plant and equipment
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 312 |  |  | $ | 242 |  |  | $ | 375 |
Others |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 312 |  |  | $ | 242 |  |  | $ | 375 |
| 8) | Acquisition of property, plant and equipment
|  | Proceeds |  |  | Gain on Disposal |
|  | Year Ended December 31 |  |  | Year Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
Others |  | $ | — |  |  | $ | 386 |  |  | $ | — |  |  | $ | 310 |
| 1) | Operating transactions
|  | Revenues |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 344 |  |  | $ | 274 |  |  | $ | 1,508 |
Others |  |  | 94 |  |  |  | 76 |  |  |  | 66 |
|  | $ | 438 |  |  | $ | 350 |  |  | $ | 1,574 |
|  | Operating Costs and Expenses |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 1,304 |  |  | $ | 964 |  |  | $ | 715 |
Others |  |  | 75 |  |  |  | 76 |  |  |  | 68 |
|  | $ | 1,379 |  |  | $ | 1,040 |  |  | $ | 783 |
| 2) | Non-operating transactions
|  | Non-operating Income and Expenses |
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Associates |  | $ | 31 |  |  | $ | 41 |  |  | $ | 37 |
Others |  |  | — |  |  |  | 4 |  |  |  | 3 |
|  | $ | 31 |  |  | $ | 45 |  |  | $ | 40 |
| 3) | Receivables
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 10 |  |  | $ | 229 |
Others |  |  | 7 |  |  |  | 1 |
|  | $ | 17 |  |  | $ | 230 |
| 4) | Contract liabilities-current
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | — |  |  | $ | 183 |
| 5) | Payables
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 651 |  |  | $ | 643 |
Others |  |  | 3 |  |  |  | 3 |
|  | $ | 654 |  |  | $ | 646 |
| 6) | Customers’ deposits
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Associates |  | $ | 8 |  |  | $ | 5 |
| 7) | Acquisition of property, plant and equipment
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 and 2020 were as follows:
|  | December 31, |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Lease liabilities - current |  | $ | 188 |  |  | $ | 182 |
Lease liabilities - noncurrent |  |  | 1,024 |  |  |  | 817 |
|  | $ | 1,212 |  |  | $ | 999 |
Compensation of Directors and Other Key Management Personnel | The compensation of directors and other key management personnel for the years ended December 31, 2018, 2019 and 2020 were as follows:
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Short-term employee benefits |  | $ | 282 |  |  | $ | 263 |  |  | $ | 290 |
Post-employment benefits |  |  | 10 |  |  |  | 9 |  |  |  | 11 |
Share-based payment |  |  | 9 |  |  |  | — |  |  |  | — |
|  | $ | 301 |  |  | $ | 272 |  |  | $ | 301 |

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