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Financial Instruments - Summary of Level 3 Fair Value Were Equity Investments classified as Financial Assets at FVTOCI (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Beginning balance	$ 131,520.9
Ending balance	126,963.4	$ 131,520.9
Level 3 [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Beginning balance	4,208.9	3,910.7	$ 5,841.4
Additions	175.2	372.3	212.5
Recognized in profit or loss	(3.8)
Recognized in other comprehensive income	409.0	129.5	(2,141.4)
Disposals and proceeds from return of capital of investments	(51.1)	(76.5)	(175.8)
Transfers out of level 3 (Note)		(43.6)
Effect of exchange rate changes	(223.3)	(83.5)	174.0
Ending balance	$ 4,514.9	$ 4,208.9	$ 3,910.7

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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]

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-Name IFRS
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-IssueDate 2020-01-01
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- Definition

The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph e
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The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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-Name IFRS
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The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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Additions Fair Value Measurement Assets

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The increase (decrease) in financial assets at fair value through other comprehensive income resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity.

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Proceeds from financial assets at fair value through other comprehensive income measured at level 3.

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