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Investments Accounted for Using Equity Method - Investments in Associates (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 2,732 |  | $ 2,326 |
The Company’s share of profits (loss) | 509 | $ 17 | 419 | $ 515
Senao Networks, Inc. ("SNI") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 768 |  | $ 704 |
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 of SNI | $ 1,447 |  | $ 2,130 |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 496 |  | $ 472 |
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 | $ 306 |  | $ 292 |
Percentage of ownership in associates | 32.00% |  | 32.00% |
Percentage of voting rights in associates | 32.00% |  | 32.00% |
Viettel-CHT Co., Ltd. ("Viettel-CHT") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 286 |  | $ 256 |
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 | $ 213 |  | $ 132 |
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 | $ 199 |  | $ 0 |
Percentage of ownership in associates | 50.00% |  | 0.00% |
Percentage of voting rights in associates | 50.00% |  | 0.00% |
KKBOX Taiwan Co., Ltd. (“KKBOXTW”) [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 147 |  | $ 140 |
Percentage of ownership in associates | 30.00% |  | 30.00% |
Percentage of voting rights in associates | 30.00% |  | 30.00% |
KingwayTek Technology Co., Ltd. ("KWT") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 97 |  | $ 90 |
Percentage of ownership in associates | 26.00% |  | 26.00% |
Percentage of voting rights in associates | 26.00% |  | 26.00% |
So-net Entertainment Taiwan Limited ("So-net") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 120 |  | $ 104 |
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 | $ 50 |  | $ 50 |
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 | $ 38 |  | $ 38 |
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 |  | $ 13 |
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 |  | $ 12 |
Percentage of ownership in associates | 22.00% |  | 22.00% |
Percentage of voting rights in associates | 22.00% |  | 22.00% |
HopeTech Technologies Limited [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 0 |  | $ 23 |
Percentage of ownership in associates | 0.00% |  | 45.00% |
Percentage of voting rights in associates | 0.00% |  | 45.00% |
Cornerstone Ventures Co., Ltd. (“CVC”) [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 5 |  | $ 0 |
Percentage of ownership in associates | 49.00% |  | 0.00% |
Percentage of voting rights in associates | 49.00% |  | 0.00% |
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% |
Associates [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
The Company’s share of profits (loss) | $ 509 |  | $ 420 | 557
The Company’s share of other comprehensive income (loss) | 5 |  | (4) | (47)
The Company’s share of total comprehensive income (loss) | $ 514 |  | $ 416 | $ 510

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