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Contents of Significant Accounts - Components of Other Comprehensive Income (Loss) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Statement of changes in equity [abstract]        
Remeasurements of defined benefit pension plans, Arising during the period $ 188,451 $ 5,747 $ 402,234 $ 296,804
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Arising during the period (539,327) (16,448) 5,530,359 (4,646,064)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Arising during the period 301,134 9,184 1,610,116 (1,694,965)
Exchange differences on translation of foreign operations, Arising during the period 8,902,745   (2,386,278) 9,292,308
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Arising during the period 324,191   (73,005) 91,442
Total other comprehensive income (loss), Arising during the period 9,177,194   5,083,426 3,339,525
Exchange differences on translation of foreign operations, Reclassification adjustments during the period 0   0 0
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Reclassification adjustments during the period (817)   (1,413) 0
Total other comprehensive income (loss), Reclassification adjustments during the period (817)   (1,413) 0
Remeasurements of defined benefit pension plans, Before tax 188,451 5,747 402,234 296,804
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Before tax (539,327)   5,530,359 (4,646,064)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Before tax 301,134 9,184 1,610,116 (1,694,965)
Exchange differences on translation of foreign operations, Before tax 8,902,745 271,508 (2,386,278) 9,292,308
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Before tax 323,374 9,862 (74,418) 91,442
Total other comprehensive income (loss), Before tax 9,176,377   5,082,013 3,339,525
Remeasurements of defined benefit pension plans, Income tax effect (37,690)   (80,447) (59,361)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Income tax effect 25,123   (243,057) (71,121)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Income tax effect 28,783   (90,891) 123,483
Exchange differences on translation of foreign operations, Income tax effect 153,317   386,660 883,238
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Income tax effect (24,317)   3,768 (23,672)
Total other comprehensive income (loss), Income tax effect 145,216   (23,967) 852,567
Remeasurements of defined benefit pension plans, Net of tax 150,761   321,787 237,443
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income, Net of tax (514,204)   5,287,302 (4,717,185)
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss, Net of tax 329,917   1,519,225 (1,571,482)
Exchange differences on translation of foreign operations, Net of tax 9,056,062   (1,999,618) 10,175,546
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss, Net of tax 299,057   (70,650) 67,770
Total other comprehensive income (loss) $ 9,321,593 $ 284,282 $ 5,058,046 $ 4,192,092