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Contents of Significant Accounts - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-term loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 0 $ 1,924,124 $ 11,057,132
Cash Flows 13,530,000 (1,965,684) (8,974,216)
Non-cash changes,Foreign exchange 0 41,560 (158,792)
Non-cash changes,Others [1] 0 0 0
Ending Balance 13,530,000 0 1,924,124
Long-term loans (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 19,279,342 36,624,907 33,066,106
Cash Flows 3,857,704 (18,816,259) 4,088,537
Non-cash changes,Foreign exchange (253,702) 1,470,694 (529,736)
Non-cash changes,Others [1] 0   0
Ending Balance 22,883,344 19,279,342 36,624,907
Bonds payable (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 28,184,687 40,536,658 18,690,384
Cash Flows 9,989,245 (13,305,050) 23,703,692
Non-cash changes,Foreign exchange 0    
Non-cash changes,Others [1],[2] 185,420 953,079 (1,857,418)
Ending Balance 38,359,352 28,184,687 40,536,658
Guarantee deposits (current portion included) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 30,757,001 [3] 14,369,769 [3] 235,992
Cash Flows 10,423,345 14,984,941 14,219,408
Non-cash changes,Foreign exchange 419,040 1,402,291 (85,631)
Non-cash changes,Others [1] 0   0
Ending Balance [3] 41,599,386 30,757,001 14,369,769
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 5,737,095 5,068,754 5,576,864
Cash Flows (666,439) (712,854) (699,680)
Non-cash changes,Foreign exchange (24,106) 153,406 (144,419)
Non-cash changes,Others [1] 346,637 1,227,789 [4] 335,989
Ending Balance 5,393,187 5,737,095 5,068,754
Other financial liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance [5] 21,449,487 20,966,209 20,746,624
Cash Flows [5] (21,209,443)    
Non-cash changes,Foreign exchange [5] (330,783) 306,902 (163,387)
Non-cash changes,Others [1],[5] 90,739 176,376 382,972
Ending Balance [5] $ 0 $ 21,449,487 $ 20,966,209
[1] Other non-cash changes mainly consisted of discount amortization measured by the effective interest method.
[2] Please refer to Note 6(13) for the Company’s exchangeable bonds.
[3] Guarantee deposits mainly consisted of deposits of capacity reservation.
[4] Mainly due to the increase in land lease.
[5] Please refer to Note 9(6) for more details on other financial liabilities.