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Non-Cash Transactions - Summary of Changes in Liabilities Arising From Financing Activities Including Non-cash Transactions (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Abstract]
Beginning Balance	$ 9,758	$ 10,340
Cash Flows from Financing Activities	(3,683)	(3,728)
Changes in Non-Cash Transactions, New Leases	3,796	3,803
Changes in Non-Cash Transactions, Acquired by business combination	71
Changes in Non-Cash Transactions, Others	(265)	(572)
Cash Flows from Operation Activities - Interest Paid	(80)	(85)
Ending Balance	$ 9,597	$ 9,758

X

- Definition

Increase decrease through financing cash flows liabilities arising from interest paid.

+ References

No definition available.

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities]

+ References

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Subsidiaries [member]]

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities]

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- Definition

The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities]

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- Definition

The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities]

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