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Contents of Significant Accounts - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 13,530,000 $ 0 $ 1,924,124
Cash Flows (5,015,000) 13,530,000 (1,965,684)
Non-cash changes,Foreign exchange 0 0 41,560
Non-cash changes,Others [1] 0 0 0
Ending Balance 8,515,000 13,530,000 0
Long-term loans (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 22,883,344 19,279,342 36,624,907
Cash Flows 13,178,434 3,857,704 (18,816,259)
Non-cash changes,Foreign exchange 415,131 (253,702) 1,470,694
Non-cash changes,Others [1] 0 0 0
Ending Balance 36,476,909 22,883,344 19,279,342
Bonds payable (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 38,359,352 28,184,687 40,536,658
Cash Flows (8,500,465) 9,989,245 (13,305,050)
Non-cash changes,Foreign exchange 0   0
Non-cash changes,Others [1] 192,681 185,420 953,079
Ending Balance 30,051,568 38,359,352 28,184,687
Guarantee deposits (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 41,599,386 [2] 30,757,001 [2] 14,369,769
Cash Flows (572,321) 10,423,345 14,984,941
Non-cash changes,Foreign exchange 1,847,429 419,040 1,402,291
Non-cash changes,Others [1] 0 0  
Ending Balance 42,874,494 41,599,386 [2] 30,757,001 [2]
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 5,393,187 5,737,095 5,068,754
Cash Flows (731,138) (666,439) (712,854)
Non-cash changes,Foreign exchange 92,617 (24,106) 153,406
Non-cash changes,Others [1] 1,664,350 [3] 346,637 1,227,789 [3]
Ending Balance 6,419,016 5,393,187 5,737,095
Other financial liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 0 21,449,487 20,966,209
Cash Flows   (21,209,443) 0
Non-cash changes,Foreign exchange   (330,783) 306,902
Non-cash changes,Others [1]   90,739 176,376
Ending Balance   $ 0 $ 21,449,487
[1] Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.
[2] Guarantee deposits mainly consisted of deposits of capacity reservation.
[3] Mainly due to the addition to lease properties.