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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)
Classes of current inventories [abstract]
Finished goods	$ 9,923.3		$ 8,521.9
Work in process	53,362.2		33,330.8
Raw materials	7,143.8		4,012.2
Supplies and spare parts	3,451.4		2,817.3
Inventories, total	$ 73,880.7	$ 2,492.6	$ 48,682.2

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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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