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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Cash
Cash on hand	$ 440		$ 487
Bank deposits	15,647		10,961
Cash	16,087		11,448
Cash equivalents (with maturities of less than three months)
Commercial papers	13,530		14,061
Negotiable certificates of deposit	7,500		2,600
Time deposits	2,657		2,308
Stimulus vouchers	5		3
Cash equivalents	23,692		18,972
Cash and cash equivalents	$ 39,779	$ 1,434	$ 30,420	$ 1,097	$ 34,050	$ 27,645

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Negotiable certificates of deposit amount.

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The amount of cash balances held at banks.

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The amount of cash on hand and demand deposits. [Refer: Cash on hand]

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

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The amount of cash held by the entity. This does not include demand deposits.

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The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Government grants]

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