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Provisions - Summary of Provisions (Detail) - Sales returns and allowances [member] - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of other provisions [line items]
Balance, beginning of year	$ 18,037.8	$ 10,163.5	$ 10,445.5
Provision	44,833.6	36,519.3	17,723.2
Payment	(48,884.7)	(28,569.3)	(18,133.1)
Effect of acquisition of subsidiary			126.0
Effect of exchange rate changes	(24.9)	(75.7)	1.9
Balance, end of year	$ 13,961.8	$ 18,037.8	$ 10,163.5

X

- Definition

The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

+ References

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The amount recognised for new other provisions. [Refer: Other provisions]

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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

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