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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Financial Assets at Fair Value through Other Comprehensive Income (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current | $ 122,998.5 |  | $ 119,519.3
Non current | 6,159.2 | $ 200.4 | 5,887.9
Investment in equity and debt instruments at FVTOCI | 129,157.7 |  | 125,407.2
Debt securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investments in debt instruments at FVTOCI | 122,720.6 |  | 119,329.5
Debt securities [member] | Corporate bonds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investments in debt instruments at FVTOCI | 66,116.2 |  | 57,253.2
Debt securities [member] | Agency bonds/Agency mortgage-backed securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investments in debt instruments at FVTOCI | 28,399.9 |  | 32,070.1
Debt securities [member] | Government bonds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investments in debt instruments at FVTOCI | 18,929.8 |  | 21,345.8
Debt securities [member] | Asset-backed securities [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investments in debt instruments at FVTOCI | 9,274.7 |  | 8,660.4
Equity instruments [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investment in equity instruments at FVTOCI | 6,437.1 |  | 6,077.7
Equity instruments [member] | Non-publicly traded stocks [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investment in equity instruments at FVTOCI | 6,159.2 |  | 5,887.9
Equity instruments [member] | Publicly traded stocks [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Investment in equity instruments at FVTOCI | $ 277.9 |  | $ 189.8

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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 2022-03-24 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_h&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 11A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_h&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_h&doctype=Standard -URIDate 2022-03-24 + Details
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