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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Cash
Cash on hand	$ 487		$ 353
Bank deposits	10,961		9,433
Cash	11,448		9,786
Cash equivalents (investments with maturities of less than three months)
Commercial paper	14,061		20,110
Negotiable certificates of deposit	2,600		1,700
Time deposits	2,308		2,451
Repurchase agreements collateralized by bonds	0		3
Government stimulus vouchers	3		0
Cash equivalents	18,972		24,264
Cash and cash equivalents	$ 30,420	$ 1,083	$ 34,050	$ 1,212	$ 27,645	$ 28,825

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Negotiable certificates of deposit amount.

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Repurchase agreements collateralized by bonds.

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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 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]; Deferred income; Government grants]

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