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Contents of Significant Accounts - Details of Distribution (Detail) - TWD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]      
Appropriation of earnings, Cash dividends $ 45,017,096   $ 19,875,842
Cash dividends $ 3 $ 3.6  
Legal Reserve [Member]      
Disclosure of equity [Line Items]      
Appropriation of earnings $ 6,255,736 $ 8,905,139  
Special Reserve [member]      
Disclosure of equity [Line Items]      
Appropriation of earnings (2,734,057) (2,180,156)  
Cash dividends [member]      
Disclosure of equity [Line Items]      
Appropriation of earnings, Cash dividends $ 37,587,102 $ 45,017,096