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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Less than 1 month [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 75,266,483 $ 2,713,283 $ 68,903,001
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 84,978 3,063 103,734
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 52,353,176 1,887,281 43,111,390
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 12,565,548 452,976 13,792,596
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 10,262,781 369,963 11,895,281
1 to 3 months [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 56,572,557 2,039,386 52,992,946
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 157,710 5,685 151,921
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 48,140,652 1,735,424 44,122,659
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 5,180,527 186,753 8,190,076
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 3,093,668 111,524 528,290
3 months to 1 year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 37,298,883 1,344,589 22,407,360
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 687,144 24,771 619,908
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 10,216,253 368,286 8,223,684
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 13,416,893 483,666 10,214,154
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 12,978,593 467,866 3,349,614
1-5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 158,925,804 5,729,121 151,252,482
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 2,585,624 93,209 1,779,041
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 291,480 10,508 319,510
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 112,493,242 4,055,272 102,253,481
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 43,555,458 1,570,132 46,900,450
More than 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 18,018,340 649,544 17,895,489
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 4,929,602 177,707 4,088,301
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 114,201 4,117 176,536
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 7,494,670 270,176 7,999,130
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 $ 5,479,867 $ 197,544 $ 5,631,522