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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Less than 1 month [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 87,258,757 $ 2,839,530 $ 75,266,483
Less than 1 month [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 120,733 3,929 84,978
Less than 1 month [member] | Non interest bearing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 65,356,106 2,126,785 52,353,176
Less than 1 month [member] | Floating interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 9,251,237 301,049 12,565,548
Less than 1 month [member] | Fixed interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 12,530,681 407,767 10,262,781
1 to 3 months [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 54,280,316 1,766,362 56,572,557
1 to 3 months [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 201,686 6,563 157,710
1 to 3 months [member] | Non interest bearing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 33,887,460 1,102,748 48,140,652
1 to 3 months [member] | Floating interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 10,982,036 357,372 5,180,527
1 to 3 months [member] | Fixed interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 9,209,134 299,679 3,093,668
3 months to 1 year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 30,644,761 997,227 37,298,883
3 months to 1 year [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 790,427 25,722 687,144
3 months to 1 year [member] | Non interest bearing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 11,145,612 362,695 10,216,253
3 months to 1 year [member] | Floating interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 9,652,804 314,117 13,416,893
3 months to 1 year [member] | Fixed interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 9,055,918 294,693 12,978,593
1-5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 141,300,566 4,598,131 158,925,804
1-5 years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 2,685,977 87,406 2,585,624
1-5 years [member] | Non interest bearing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 20,498 667 291,480
1-5 years [member] | Floating interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 93,837,521 3,053,613 112,493,242
1-5 years [member] | Fixed interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 44,756,570 1,456,445 43,555,458
More than 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 10,899,888 354,699 18,018,340
More than 5 years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 5,147,266 167,500 4,929,602
More than 5 years [member] | Non interest bearing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 74,643 2,429 114,201
More than 5 years [member] | Floating interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 5,648,699 183,817 7,494,670
More than 5 years [member] | Fixed interest rate [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 29,280 $ 953 $ 5,479,867