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Investments Accounted For Using Equity Method - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2021 NumberofSeat | Dec. 31, 2023 TWD ($) NumberofSeat | Nov. 30, 2022 TWD ($) | Apr. 30, 2022 TWD ($) | Dec. 31, 2023 TWD ($) NumberofSeat | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($) | Mar. 31, 2022 TWD ($) | Aug. 31, 2021 | Jun. 30, 2021 TWD ($) | Mar. 31, 2021 TWD ($)
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates |  | $ 8,243,000,000 |  |  | $ 8,243,000,000 | $ 6,939,000,000 |  |  |  |  |
Investment in joint venture |  | $ 9,000,000 |  |  | $ 9,000,000 | $ 10,000,000 |  |  |  |  |
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% | 41.90% |  |  |  |  |
Price of investments in associates |  | $ 1,544,000,000 |  |  | $ 1,544,000,000 |  |  |  |  |  |
Investments in associates |  | $ 4,293,000,000 |  |  | $ 4,293,000,000 | $ 3,173,000,000 |  |  |  |  |
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 |  | 23.00% |  |  | 23.00% | 23.00% |  |  |  |  |
WiAdvance Technology Corporation ("WATC") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  | 19.00% |  |  | 19.00% | 20.00% |  |  |  |  | 20.33%
No of seats allotted | NumberofSeat |  | 1 |  |  | 1 |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  | 3 |  |  | 3 |  |  |  |  |  |
Investments in associates |  |  |  |  |  |  |  |  |  |  | $ 274,000,000
Percentage of ownership in associates |  |  |  |  | 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% |
Investments in associates |  | $ 57,000,000 |  |  | $ 57,000,000 | $ 63,000,000 |  |  |  | $ 56,000,000 |
Alliance Digital Tech Co., Ltd. ("ADT") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  | 0.00% |  |  | 0.00% | 0.00% |  |  |  |  |
Investments in associates |  | $ 0 |  |  | $ 0 | $ 0 |  |  |  |  |
Gain on disposal of investment |  |  |  |  |  |  | $ 4,000,000 |  |  |  |
Percentage of ownership in associates | 14.00% |  |  |  |  |  |  |  |  |  |
Liquidation distribution |  |  |  |  |  |  | $ 9,000,000 |  |  |  |
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% | 40.00% |  | 40.00% |  |  |
Investments in associates |  | $ 10,000,000 |  |  | $ 10,000,000 | $ 13,000,000 |  | $ 20,000,000 |  |  |
Chunghwa SEA Holdings ("CHT SEA") [Member] | Joint ventures [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in joint venture |  | $ 9,000,000 |  |  | $ 9,000,000 | $ 10,000,000 |  |  |  |  |
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 |  | $ 285,000,000 |  |  | $ 285,000,000 | $ 247,000,000 |  |  |  |  |
Proceeds from capital reduction |  |  |  | $ 340,000,000 |  |  |  |  |  |  |
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% |  |  | 50.00% |  |  |  |  |  |
No of seats allotted | NumberofSeat |  | 2 |  |  | 2 |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  | 5 |  |  | 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% |  |  | 49.00% |  |  |  |  |  |
No of seats allotted | NumberofSeat |  | 2 |  |  | 2 |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  | 5 |  |  | 5 |  |  |  |  |  |
AgriTalk Technology Inc. ("ATT") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 17.19% |  |  |  |  | 29.33% |  |  |  |  |
No of seats allotted | NumberofSeat | 1 |  |  |  |  |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat | 3 |  |  |  |  |  |  |  |  |  |
Subscribed capital |  |  | $ 32,000,000 |  |  |  |  |  |  |  |
Imedtac Co., Ltd. ("IME") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates |  | 6.74% |  |  | 6.74% |  | 6.74% |  | 7.54% |  |
No of seats allotted | NumberofSeat |  | 1 |  |  | 1 |  |  |  |  |  |
Number of seats available for board of directors | NumberofSeat |  | 5 |  |  | 5 |  |  |  |  |  |
Investments in associates |  | $ 11,000,000 |  |  | $ 11,000,000 |  |  |  |  |  |

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