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Investments Accounted for Using Equity Method - Investments in Associates (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2024 USD ($) | Oct. 31, 2024 TWD ($) | Aug. 31, 2024 TWD ($) | Aug. 31, 2024 USD ($) | May 31, 2024 TWD ($) | Feb. 28, 2024 USD ($) | Mar. 31, 2022 TWD ($)
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 8,870 |  | $ 8,243 |  |  |  |  |  |  |  |
Investment in joint venture | 9 |  | 9 |  |  |  |  |  |  |  |
Investments accounted for using equity method | 8,879 |  | 8,252 |  | $ 271 |  |  |  |  |  |
The Company's share of profits (loss) | 157 | $ 5 | 253 | $ 442 |  |  |  |  |  |  |
Next Commercial Bank Co., Ltd. ("NCB") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | 3,951 |  | 4,293 |  |  |  |  |  |  |  |
Investments accounted for using equity method | $ 3,951 |  | $ 4,293 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 46.26% |  | 46.26% | 41.90% | 46.26% |  |  |  |  |  |
Senao Networks, Inc. ("SNI") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 1,849 |  | $ 1,409 |  |  | $ 376 |  |  |  |  |
Percentage of ownership in associates | 33.16% |  | 34.00% |  | 33.16% |  |  |  |  |  |
Fair values based on the closing market prices | $ 3,838 |  | $ 4,062 |  |  |  |  |  |  |  |
KingwayTek Technology Co., Ltd. ("KWT") - Listed [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 242 |  | $ 229 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 23.00% |  | 23.00% |  | 23.00% |  |  |  |  |  |
Viettel-CHT Co., Ltd. ("Viettel-CHT") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 573 |  | $ 543 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |  |  |  |
Taiwan International Standard Electronics Co., Ltd. ("TISE") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 373 |  | $ 309 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 40.00% |  | 40.00% |  | 40.00% |  |  |  |  |  |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 313 |  | $ 285 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 38.00% |  | 38.00% |  | 38.00% |  |  |  |  |  |
Taiwania Hive Technology Fund L.P. ('TWTF') [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 276 |  | $ 0 |  |  |  | $ 288 | $ 9 |  | $ 30 |
Percentage of ownership in associates | 42.00% |  | 0.00% |  | 42.00% |  | 41.75% | 41.75% |  |  |
WiAdvance Technology Corporation ("WATC") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 274 |  | $ 212 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 16.00% |  | 19.00% |  | 16.00% |  |  |  |  |  |
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 253 |  | $ 258 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 50.00% |  | 50.00% |  | 50.00% |  |  |  |  |  |
So-net Entertainment Taiwan Limited ("So-net") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 193 |  | $ 226 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |  |  |  |
KKBOX Taiwan Co., Ltd. ("KKBOXTW") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 151 |  | $ 165 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |  |  |  |
Taiwan International Ports Logistics Corporation ("TIPL") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 132 |  | $ 120 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 27.00% |  | 27.00% |  | 27.00% |  |  |  |  |  |
Porrima Inc. ('PORRIMA') [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 78 |  | $ 0 |  |  |  |  |  | $ 80 |  |
Percentage of ownership in associates | 10.00% |  | 0.00% |  | 10.00% |  |  |  | 10.00% |  |
CHT Infinity Singapore Pte. Ltd. ("CISG") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 61 |  | $ 57 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 40.00% |  | 40.00% |  | 40.00% |  |  |  |  |  |
Imedtac Co., Ltd. ("IME") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 57 |  | $ 47 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 10.00% |  | 7.00% |  | 10.00% |  |  |  |  |  |
Click Force Co., Ltd. ("CF") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 51 |  | $ 42 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |  |  |  |
AgriTalk Technology Inc. ("ATT") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 26 |  | $ 31 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 29.00% |  | 29.00% |  | 29.00% |  |  |  |  |  |
Baohwa Trust Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 12 |  | $ 10 |  |  |  |  |  |  |  | $ 20
Percentage of ownership in associates | 25.00% |  | 25.00% |  | 25.00% |  |  |  |  |  | 40.00%
Cornerstone Ventures Co., Ltd. ("CVC") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments in associates | $ 5 |  | $ 7 |  |  |  |  |  |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |  |  |  |
Next Commercial Bank Co., Ltd. ("NCB") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 46.00% |  | 46.00% |  | 46.00% |  |  |  |  |  |
KingwayTek Technology Co., Ltd. ("KWT") [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in associates | 22.58% |  |  |  | 22.58% |  |  |  |  |  |
Fair values based on the closing market prices | $ 897 |  | $ 988 |  |  |  |  |  |  |  |
Total for all associates [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |  |  |  |
The Company's share of profits (loss) | 494 |  | 647 | $ 868 |  |  |  |  |  |  |
The Company's share of other comprehensive income (loss) | 40 |  | (23) | 13 |  |  |  |  |  |  |
The Company's share of total comprehensive income (loss) | $ 534 |  | $ 624 | $ 881 |  |  |  |  |  |  |

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- Definition The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Total for all associates [member]; Investments in associates reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_b_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_24_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B16 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16_c&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 + Details
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