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Contents of Significant Accounts - Major Categories of Plan Assets as a Percentage of Fair Value of the Total Plan Assets (Detail)	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Fair Value Of Plan Assets [Abstract]
Cash	21.00%	20.00%
Equity instruments	46.00%	47.00%
Debt instruments	23.00%	22.00%
Others	10.00%	11.00%

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- Definition

Percentage of cash in the plan assets.

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Percentage of debt instruments in the plan assets.

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Percentage of equity instruments in the plan assets.

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- Definition

Percentage ​of othe​r assets ​in the​ plan​ assets.

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