v3.26.1
Contents of Significant Accounts - Operating Costs and Expenses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries $ 35,791,452   $ 37,444,947 $ 38,696,110
Labor and health insurance 1,790,171   1,910,169 2,060,096
Pension 2,087,395   2,013,217 1,700,656
Other employee benefit expenses 589,683   609,254 618,610
Depreciation 56,301,155   45,336,692 37,551,088
Amortization 2,831,540 $ 90,263 2,695,564 2,726,481
Operating costs [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 25,094,595   25,959,209 26,693,905
Labor and health insurance 1,289,440   1,383,016 1,502,553
Pension 1,573,958   1,511,302 1,240,577
Other employee benefit expenses 393,893   401,329 421,871
Depreciation 53,321,558   43,740,758 36,006,021
Amortization 1,309,907   1,041,562 1,277,920
Operating expenses [member]        
Disclosure Of Operating Costs And Expenses [Line Items]        
Salaries 10,696,857   11,485,738 12,002,205
Labor and health insurance 500,731   527,153 557,543
Pension 513,437   501,915 460,079
Other employee benefit expenses 195,790   207,925 196,739
Depreciation 2,979,597   1,595,934 1,545,067
Amortization $ 1,521,633   $ 1,654,002 $ 1,448,561