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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, 2018 TWD ($) $ / shares	Dec. 31, 2017 TWD ($) $ / shares	Dec. 31, 2016 TWD ($) $ / shares	Dec. 31, 2018 USD ($)
Special capital reserve	$ 276,033.9	$ 241,722.7		$ 9,017.8
Total	$ (207,443.0)	$ (181,512.7)	$ (155,582.3)
Cash dividends to shareholders | $ / shares	$ 8	$ 8	$ 7
Appropriation of earnings [member]
Legal capital reserve	$ 35,113.1	$ 34,311.2	$ 33,424.7
Special capital reserve	(11,459.5)	26,907.5
Cash dividends to shareholders	207,443.0	207,443.0	181,512.7
Total	$ 231,096.6	$ 268,661.7	$ 214,937.4

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]]

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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]

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

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