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Equity - Appropriations of Earnings and Dividends Per Share (Detail) $ / shares in Units, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($) $ / shares	Dec. 31, 2016 TWD ($) $ / shares	Dec. 31, 2015 TWD ($) $ / shares	Dec. 31, 2017 USD ($)
Cash dividends to shareholders | $ / shares	$ 8	$ 7	$ 6
Special capital reserve	$ 241,722.7	$ 208,298.0		$ 8,155.3
Total	(181,512.7)	(155,582.3)	$ (116,683.5)
Appropriation of earnings [member]
Legal capital reserve	34,311.2	33,424.7	30,657.4
Special capital reserve	26,907.5
Cash dividends to shareholders	207,443.0	181,512.7	155,582.3
Total	$ 268,661.7	$ 214,937.4	$ 186,239.7

X

- Definition

A component of equity representing the capital reserves.

+ References

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- Definition

The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]]

+ References

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- Definition

The amount, per share, of dividends recognised as distributions to owners.

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- Definition

The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings]

+ References

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- Definition

The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve]

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