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Contents of Significant Accounts - Operating Costs and Expenses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries $ 38,696,110   $ 44,003,174 $ 35,195,095
Labor and health insurance 2,060,096   1,840,591 1,641,494
Pension 1,700,656   1,913,828 1,658,923
Other employee benefit expenses 618,610   538,853 480,497
Depreciation 37,551,088   41,061,930 43,911,464
Amortization 2,726,481 $ 89,043 2,841,334 2,894,942
Operating costs [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 26,693,905   30,074,528 23,388,888
Labor and health insurance 1,502,553   1,368,803 1,183,315
Pension 1,240,577   1,489,076 1,259,044
Other employee benefit expenses 421,871   373,739 335,829
Depreciation 36,006,021   39,305,321 42,002,745
Amortization 1,277,920   1,470,912 834,384
Operating expenses [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 12,002,205   13,928,646 11,806,207
Labor and health insurance 557,543   471,788 458,179
Pension 460,079   424,752 399,879
Other employee benefit expenses 196,739   165,114 144,668
Depreciation 1,545,067   1,756,609 1,908,719
Amortization $ 1,448,561   $ 1,370,422 $ 2,060,558