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Financial Assets at Fair Value Through Other Comprehensive Income-2018 - Summary of Financial Assets at Fair Value through Other Comprehensive Income (Detail) - Dec. 31, 2018 $ in Millions, $ in Millions | TWD ($) | USD ($)
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Disclosure of financial assets [line items] |  |
Current | $ 99,561.7 |
Non current | 3,910.7 | $ 127.8
Investment in equity and debt instruments at FVTOCI | 103,472.4 |
Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 98,971.6 |
Debt securities [member] | Corporate bonds [member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 40,753.6 |
Debt securities [member] | Agency bonds/Agency mortgage-backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 31,288.8 |
Debt securities [member] | Asset-backed securities [Member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 15,670.3 |
Debt securities [member] | Government bonds [member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 11,151.3 |
Debt securities [member] | Commercial paper [member] |  |
Disclosure of financial assets [line items] |  |
Investments in debt instruments at FVTOCI | 107.6 |
Equity instruments [member] |  |
Disclosure of financial assets [line items] |  |
Investment in equity instruments at FVTOCI | 4,500.8 |
Equity instruments [member] | Non-publicly traded stocks [member] |  |
Disclosure of financial assets [line items] |  |
Investment in equity instruments at FVTOCI | 3,910.7 |
Equity instruments [member] | Publicly traded stocks [member] |  |
Disclosure of financial assets [line items] |  |
Investment in equity instruments at FVTOCI | $ 590.1 |

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- Definition The amount of current financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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