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Investments Accounted For Using Equity Method - Additional Information (Detail) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 TWD ($) | Nov. 30, 2022 TWD ($) | Apr. 30, 2022 TWD ($) | Dec. 31, 2024 TWD ($) NumberofSeat | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 | Oct. 31, 2024 TWD ($) | Aug. 31, 2024 TWD ($) | Aug. 31, 2024 USD ($) | May 31, 2024 TWD ($) | Apr. 30, 2024 TWD ($) | Feb. 28, 2024 USD ($) | Mar. 31, 2022 TWD ($)
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 8,243 |  |  | $ 8,870 | $ 8,243 |  |  |  |  |  |  |  |
Investment in joint venture | $ 9 |  |  | $ 9 | $ 9 |  |  |  |  |  |  |  |
Next Commercial Bank Co., Ltd. ("NCB") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 46.26% |  |  | 46.26% | 46.26% | 41.90% |  |  |  |  |  |  |
Investments in associates | $ 4,293 |  |  | $ 3,951 | $ 4,293 |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  |  | 46.26% |  |  |  |  |  |  |  |
Reduction percentage of capital to offset accumulated deficit | 26.43% |  |  |  |  |  |  |  |  |  |  |  |
KingwayTek Technology Co., Ltd. ("KWT") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  | 22.58% |  |  |  |  |  |  |  |  |
Senao Networks, Inc. ("SNI") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 34.00% |  |  | 33.16% | 34.00% |  |  |  |  |  |  |  |
Investments in associates | $ 1,409 |  |  | $ 1,849 | $ 1,409 |  | $ 376 |  |  |  |  |  |
Taiwania Hive Technology Fund L.P. ('TWTF') [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 0.00% |  |  | 42.00% | 0.00% |  |  | 41.75% | 41.75% |  |  |  |
Investments in associates | $ 0 |  |  | $ 276 | $ 0 |  |  | $ 288 | $ 9 |  |  | $ 30 |
Porrima Inc. ('PORRIMA') [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 0.00% |  |  | 10.00% | 0.00% |  |  |  |  | 10.00% |  |  |
Investments in associates | $ 0 |  |  | $ 78 | $ 0 |  |  |  |  | $ 80 |  |  |
WiAdvance Technology Corporation ("WATC") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
No of seats allotted | NumberofSeat |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  |  |  | 5 |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  | 16.24% | 19.22% | 20.05% |  |  |  |  |  |  |
CHT Infinity Singapore Pte. Ltd. ("CISG") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 40.00% |  |  | 40.00% | 40.00% |  |  |  |  |  |  |  |
Investments in associates | $ 57 |  |  | $ 61 | $ 57 |  |  |  |  |  |  |  |
Baohwa Trust Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 25.00% |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  | 40.00%
Price of investments in associates | $ 1,544 |  |  |  | $ 1,544 |  |  |  |  |  |  |  |
Investments in associates | 10 |  |  | $ 12 | 10 |  |  |  |  |  |  |  | $ 20
Chunghwa SEA Holdings ("CHT SEA") [Member] | Joint ventures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in joint venture | $ 9 |  |  | $ 9 | $ 9 |  |  |  |  |  |  |  |
Percentage of ownership in joint venture |  |  |  | 51.00% | 51.00% |  |  |  |  |  |  |  |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 38.00% |  |  | 38.00% | 38.00% |  |  |  |  |  |  |  |
Investments in associates | $ 285 |  |  | $ 313 | $ 285 |  |  |  |  |  |  |  |
Subscribed capital |  |  | $ 340 |  |  |  |  |  |  |  |  |  |
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
No of seats allotted | NumberofSeat |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  |  |  | 5 |  |  |  |  |  |  |  |  |
Cornerstone Ventures Co., Ltd. ("CVC") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  | 49.00% |  |  |  |  |  |  |  |  |
AgriTalk Technology Inc. ("ATT") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  |  |  | 29.33% |  |  |  |  |  |  |
Subscribed capital |  | $ 32 |  |  |  |  |  |  |  |  |  |  |
Imedtac Co., Ltd. ("IME") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
No of seats allotted | NumberofSeat |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  |  |  | 5 |  |  |  |  |  |  |  |  |
Investments in associates | $ 11 |  |  |  | $ 11 |  |  |  |  |  | $ 32 |  |

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