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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Less than 1 month [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 52,919,574 $ 1,769,293 $ 56,595,145
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 75,388 2,520  
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 35,283,757 1,179,664 33,156,044
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 10,740,844 359,105 15,762,004
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 6,819,585 228,004 7,677,097
1 to 3 months [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 49,340,483 1,649,632 46,432,142
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 115,297 3,855  
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 38,803,904 1,297,356 34,493,000
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 6,708,303 224,283 7,127,606
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 3,712,979 124,138 4,811,536
3 months to 1 year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 29,672,377 992,056 32,652,272
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 532,747 17,812  
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 7,989,256 267,110 6,899,093
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 18,868,999 630,859 25,510,718
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 2,281,375 76,275 242,461
1-5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 169,317,078 5,660,885 144,693,229
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 1,536,600 51,374  
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 33,797 1,130 57,375
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 133,341,087 4,458,077 131,014,040
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 34,405,594 1,150,304 13,621,814
More than 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 15,477,307 517,463 4,564,069
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 4,412,859 147,538  
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 184,338 6,163 196,523
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 7,190,891 240,418  
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 $ 3,689,219 $ 123,344 $ 4,367,546