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Net Income and Other Comprehensive Income (Loss) - Other Income (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015 TWD ($)
Analysis Of Income And Expense [Abstract]
Dividend income	$ 328	$ 11	$ 391	$ 218
Rental income	61		41	38
Income from Piping Fund	0		202	202
Others	447		438	192
Other income	$ 836	$ 28	$ 1,072	$ 650

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Income from piping fund.

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Miscellaneous other non operating income.

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The amount of non-operating income 1.

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- Definition

The amount of income recognised from rental activities.

+ References

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The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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