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Financial Instruments - Fair Value of Financial Instruments Not Measured at Fair Value but for which Fair Value is Disclosed (Detail) - TWD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 1,864,862.6	$ 1,413,495.3
Financial liabilities	1,669,387.6	1,356,648.7
Financial assets at amortised cost, class [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	129,727.4
Financial assets at amortised cost, class [member] | Corporate bonds [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	80,994.9	5,307.0
Financial assets at amortised cost, class [member] | Commercial paper [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	48,732.5
Financial liabilities at amortised cost [member] | Bonds payable including long-term liabilities-current portion) [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	852,436.4	614,470.7
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	129,118.1
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Corporate bonds [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	80,236.1	5,318.0
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Commercial paper [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	48,882.0
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial liabilities at amortised cost [member] | Bonds payable including long-term liabilities-current portion) [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, at fair value	$ 765,301.5	$ 613,514.7

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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