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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Miscellaneous Assets [Abstract]
Spare parts	$ 2,836		$ 2,156
Refundable deposits	1,971		2,009
Other financial assets	1,000		1,000
Others	2,035		2,450
Other assets	7,842		7,615
Others	143		193
Other current assets	2,979	$ 108	2,349
Others	1,892		2,257
Other noncurrent assets	$ 4,863	$ 176	$ 5,266

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The amount of long-term deposits held by the entity.

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The amount of assets that the entity does not separately disclose in the same statement or note.

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The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

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The amount of non-current non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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A classification of current inventory representing the amount of interchangeable parts that are kept in an inventory and are used for the repair or replacement of failed parts. [Refer: Inventories]

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