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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)
Classes of current inventories [abstract]
Finished goods	$ 11,329.8		$ 9,923.3
Work in process	72,071.9		53,362.2
Raw materials	15,233.9		7,143.8
Supplies and spare parts	4,595.4		3,451.4
Inventories, total	$ 103,231.0	$ 3,372.5	$ 73,880.7

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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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