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Investments Accounted for Using Equity Method - Investments in Associates (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Nov. 30, 2019 TWD ($) | Feb. 28, 2019 TWD ($)
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 7,139,000,000 |  | $ 2,732,000,000 |  |  |
The Company’s share of profits (loss) | 459,000,000 | $ 15 | 509,000,000 | $ 419,000,000 |  |
Next Commercial Bank Co., Ltd. (preparatory office) (“NCB”) [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 4,074,000,000 |  | $ 0 |  | $ 4,190,000,000 | $ 4,190,000,000
Percentage of ownership in associates | 41.90% |  | 0.00% |  | 41.90% | 41.90%
Percentage of voting rights in associates | 42.00% |  | 0.00% |  |  |
Senao Networks, Inc. ("SNI") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 803,000,000 |  | $ 768,000,000 |  |  |
Percentage of ownership in associates | 34.00% |  | 34.00% |  |  |
Percentage of voting rights in associates | 34.00% |  | 34.00% |  |  |
Fair values based on the closing market prices | $ 2,014,000,000 |  | $ 1,447,000,000 |  |  |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 501,000,000 |  | $ 496,000,000 |  |  |
Percentage of ownership in associates | 38.00% |  | 38.00% |  |  |
Percentage of voting rights in associates | 38.00% |  | 38.00% |  |  |
International Integrated System, Inc. ("IISI") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 335,000,000 |  | $ 306,000,000 |  |  |
Percentage of ownership in associates | 31.00% |  | 32.00% |  |  |
Percentage of voting rights in associates | 31.00% |  | 32.00% |  |  |
Viettel-CHT Co., Ltd. ("Viettel-CHT") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 317,000,000 |  | $ 286,000,000 |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  |  |
Taiwan International Standard Electronics Co., Ltd. ("TISE") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 268,000,000 |  | $ 213,000,000 |  |  |
Percentage of ownership in associates | 40.00% |  | 40.00% |  |  |
Percentage of voting rights in associates | 40.00% |  | 40.00% |  |  |
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 194,000,000 |  | $ 199,000,000 |  |  |
Percentage of ownership in associates | 50.00% |  | 50.00% |  |  |
Percentage of voting rights in associates | 50.00% |  | 50.00% |  |  |
KingwayTek Technology Co., Ltd. (“KWT”) - Listed [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 217,000,000 |  | $ 0 |  |  |
KKBOX Taiwan Co., Ltd. ("KKBOXTW") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 151,000,000 |  | $ 147,000,000 |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  |  |
So-net Entertainment Taiwan Limited ("So-net") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 186,000,000 |  | $ 120,000,000 |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  |  |
Taiwan International Ports Logistics Corporation ("TIPL") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 51,000,000 |  | $ 50,000,000 |  |  |
Percentage of ownership in associates | 27.00% |  | 27.00% |  |  |
Percentage of voting rights in associates | 27.00% |  | 27.00% |  |  |
Click Force Co., Ltd. ("CF") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 37,000,000 |  | $ 38,000,000 |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  |  |
Percentage of voting rights in associates | 49.00% |  | 49.00% |  |  |
Alliance Digital Tech Co., Ltd. ("ADT") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 3,000,000 |  | $ 3,000,000 |  |  |
Percentage of ownership in associates | 14.00% |  | 14.00% |  |  |
Percentage of voting rights in associates | 14.00% |  | 14.00% |  |  |
UUPON Inc [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates |  |  | $ 4,000,000 |  |  |
Investments in associates, negative equity | $ (3,000,000) |  |  |  |  |
Percentage of ownership in associates | 22.00% |  | 22.00% |  |  |
Percentage of voting rights in associates | 22.00% |  | 22.00% |  |  |
Cornerstone Ventures Co., Ltd. ("CVC") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 5,000,000 |  | $ 5,000,000 |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  |  |
Percentage of voting rights in associates | 49.00% |  | 49.00% |  |  |
MeWorks LIMITED (HK) ("MeWorks") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 0 |  | $ 0 |  |  |
Percentage of ownership in associates | 20.00% |  | 20.00% |  |  |
Percentage of voting rights in associates | 20.00% |  | 20.00% |  |  |
KingwayTek Technology Co., Ltd. (“KWT”) - Non-listed [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Investments in associates | $ 0 |  | $ 97,000,000 |  |  |
KingwayTek Technology Co., Ltd. ("KWT") [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Percentage of ownership in associates | 23.00% |  | 26.00% |  |  |
Percentage of voting rights in associates | 23.00% |  | 26.00% |  |  |
Fair values based on the closing market prices | $ 873,000,000 |  |  |  |  |
Associates [Member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
The Company’s share of profits (loss) | 575,000,000 |  | $ 509,000,000 | 420,000,000 |  |
The Company’s share of other comprehensive income (loss) | (3,000,000) |  | 5,000,000 | (4,000,000) |  |
The Company’s share of total comprehensive income (loss) | $ 572,000,000 |  | $ 514,000,000 | $ 416,000,000 |  |

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