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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)
Classes of current inventories [abstract]
Finished goods	$ 8,924.5		$ 11,329.8
Work in process	51,969.1		72,071.9
Raw materials	16,552.3		15,233.9
Supplies and spare parts	5,535.3		4,595.4
Inventories, total	$ 82,981.2	$ 2,774.4	$ 103,231.0

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A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

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The amount of current inventories. [Refer: Inventories]

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A classification of current inventory representing the amount of assets to be consumed in the production process or in the rendering of services. [Refer: Inventories]

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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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A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

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