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Contents of Significant Accounts - Operating Costs and Expenses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries $ 37,444,947   $ 38,696,110 $ 44,003,174
Labor and health insurance 1,910,169   2,060,096 1,840,591
Pension 2,013,217   1,700,656 1,913,828
Other employee benefit expenses 609,254   618,610 538,853
Depreciation 45,336,692   37,551,088 41,061,930
Amortization 2,695,564 $ 82,207 2,726,481 2,841,334
Operating costs [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 25,959,209   26,693,905 30,074,528
Labor and health insurance 1,383,016   1,502,553 1,368,803
Pension 1,511,302   1,240,577 1,489,076
Other employee benefit expenses 401,329   421,871 373,739
Depreciation 43,740,758   36,006,021 39,305,321
Amortization 1,041,562   1,277,920 1,470,912
Operating expenses [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 11,485,738   12,002,205 13,928,646
Labor and health insurance 527,153   557,543 471,788
Pension 501,915   460,079 424,752
Other employee benefit expenses 207,925   196,739 165,114
Depreciation 1,595,934   1,545,067 1,756,609
Amortization $ 1,654,002   $ 1,448,561 $ 1,370,422