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Investments Accounted for Using Equity Method - Investments in Associates (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 2,326 |  | $ 2,383 |
The Company’s share of profit | 419 | $ 14 | 515 | $ 897
Senao Networks, Inc. ("SNI") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 704 |  | $ 680 |
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 | $ 2,130 |  | $ 2,537 |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 472 |  | $ 467 |
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 | $ 292 |  | $ 307 |
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 | $ 256 |  | $ 275 |
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 | $ 132 |  | $ 142 |
Percentage of ownership in associates | 40.00% |  | 40.00% |
Percentage of voting rights in associates | 40.00% |  | 40.00% |
Skysoft Co., Ltd. ("SKYSOFT") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 140 |  | $ 145 |
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 | $ 90 |  | $ 84 |
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 | $ 104 |  | $ 111 |
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 |  | $ 57 |
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 |  | $ 37 |
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 | $ 13 |  | $ 32 |
Percentage of ownership in associates | 14.00% |  | 14.00% |
Percentage of voting rights in associates | 14.00% |  | 14.00% |
Dian Zuan Integrating Marketing Co., Ltd. ("DZIM") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 12 |  | $ 22 |
Percentage of ownership in associates | 22.00% |  | 26.00% |
Percentage of voting rights in associates | 22.00% |  | 26.00% |
HopeTech Technologies Limited ("HopeTech") [Member] |  |  |  |
Disclosure of associates [Line Items] |  |  |  |
Investments in associates | $ 23 |  | $ 24 |
Percentage of ownership in associates | 45.00% |  | 45.00% |
Percentage of voting rights in associates | 45.00% |  | 45.00% |
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 profit | $ 420 |  | $ 557 | 926
The Company’s share of other comprehensive (loss) income | (4) |  | (47) | (19)
The Company’s share of total comprehensive income | $ 416 |  | $ 510 | $ 907

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