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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 Inventories [Abstract]
Merchandise	$ 5,133		$ 4,136
Project in process	1,390		961
Work in process	152		109
Raw materials	89		143
Inventories subtotal	6,764		5,349
Land held under development	1,999		1,999
Construction in progress	77		75
Inventories	$ 8,840	$ 298	$ 7,423

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Current project in progress.

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Land held under development.

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The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets]

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A classification of current inventory representing the amount of materials and supplies to be consumed in a production process or while rendering services. [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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