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Contents of Significant Accounts - Earnings Per Share (Detail)
$ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
TWD ($)
$ / shares
shares
Dec. 31, 2021
TWD ($)
$ / shares
shares
Earnings per share-basic        
Net income attributable to the parent company $ 59,688,950 $ 1,949,345 $ 89,478,805 $ 51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares) 12,137,954 12,137,954 12,095,312 12,005,126
Earnings per share-basic (NTD) | (per share) $ 4.92 $ 0.16 $ 7.4 $ 4.27
Earnings per share-diluted        
Net income attributable to the parent company $ 59,688,950 $ 1,949,345 $ 89,478,805 $ 51,246,425
Weighted-average number of ordinary shares for basic earnings per share (thousand shares) 12,137,954 12,137,954 12,095,312 12,005,126
Effect of dilution        
Restricted stocks for employees 114,974 114,974 156,098 159,478
Employees' compensation 129,196 129,196 238,242 80,243
Weighted-average number of ordinary shares after dilution (thousand shares) 12,382,124 12,382,124 12,489,652 12,244,847
Earnings per share-diluted (NTD) | (per share) $ 4.82 $ 0.16 $ 7.16 $ 4.19