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Equity - Appropriations of Earnings and Dividends Per Share (Detail) $ / shares in Units, $ in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2021 TWD ($) $ / shares	Mar. 31, 2021 TWD ($) $ / shares	Dec. 31, 2020 TWD ($) $ / shares	Sep. 30, 2020 TWD ($) $ / shares	Jun. 30, 2020 TWD ($) $ / shares	Mar. 31, 2020 TWD ($) $ / shares	Dec. 31, 2019 TWD ($) $ / shares	Sep. 30, 2019 TWD ($) $ / shares	Jun. 30, 2019 TWD ($) $ / shares	Mar. 31, 2019 TWD ($) $ / shares	Jun. 30, 2021 USD ($)
Special capital reserve	$ 48,392.8		$ 42,259.1								$ 1,733.9
Cash dividends to shareholders | $ / shares	$ 2.75	$ 2.75	$ 2.5	$ 2.5	$ 2.5	$ 2.5	$ 2.5	$ 2.5	$ 2.5	$ 2.0
Appropriation of earnings [member]
Resolution date of TSMC's Board of Directors in its meeting	Aug. 10, 2021	Jun. 09, 2021	Feb. 09, 2021	Nov. 10, 2020	Aug. 11, 2020	May 12, 2020	Feb. 11, 2020	Nov. 12, 2019	Aug. 13, 2019	Jun. 05, 2019
Special capital reserve	$ 10,201.2	$ (6,287.0)	$ 12,420.7	$ 5,501.3	$ 11,884.5	$ (2,694.8)	$ 16,893.0	$ 3,289.2	$ (3,338.2)	$ (4,724.0)
Cash dividends to shareholders	$ 71,308.5	$ 71,308.5	$ 64,826.0	$ 64,826.0	$ 64,826.0	$ 64,826.0	$ 64,826.0	$ 64,826.0	$ 64,826.0	$ 51,860.8

X

- 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

Resolution date of board meeting.

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- Definition

Special capital reserve.

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