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Bonds Payable - Major Terms of Domestic Unsecured Bonds (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Domestic Unsecured Bonds Hundred And Ten One [Member] | Tranche A [member]  
Bonds payable [line items]  
Issuance starting period 2021-03
Issuance ending period 2026-03
Coupon Rate 0.50%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten One [Member] | Tranche B [member]  
Bonds payable [line items]  
Issuance starting period 2021-03
Issuance ending period 2028-03
Coupon Rate 0.55%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten One [Member] | Tranche C [member]  
Bonds payable [line items]  
Issuance starting period 2021-03
Issuance ending period 2031-03
Coupon Rate 0.60%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten One [Member] | Taiwan [member] | Tranche A [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 4,800.0
Domestic Unsecured Bonds Hundred And Ten One [Member] | Taiwan [member] | Tranche B [member]  
Bonds payable [line items]  
Domestic unsecured bonds 11,400.0
Domestic Unsecured Bonds Hundred And Ten One [Member] | Taiwan [member] | Tranche C [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 4,900.0
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Tranche A [member]  
Bonds payable [line items]  
Issuance starting period 2021-05
Issuance ending period 2026-05
Coupon Rate 0.50%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Tranche B [member]  
Bonds payable [line items]  
Issuance starting period 2021-05
Issuance ending period 2028-05
Coupon Rate 0.58%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Tranche C [member]  
Bonds payable [line items]  
Issuance starting period 2021-05
Issuance ending period 2031-05
Coupon Rate 0.65%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Taiwan [member] | Tranche A [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 5,200.0
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Taiwan [member] | Tranche B [member]  
Bonds payable [line items]  
Domestic unsecured bonds 8,400.0
Domestic Unsecured Bonds Hundred And Ten Two [Member] | Taiwan [member] | Tranche C [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 5,600.0
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Tranche A [member]  
Bonds payable [line items]  
Issuance starting period 2021-06
Issuance ending period 2026-06
Coupon Rate 0.52%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Tranche B [member]  
Bonds payable [line items]  
Issuance starting period 2021-06
Issuance ending period 2028-06
Coupon Rate 0.58%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Tranche C [member]  
Bonds payable [line items]  
Issuance starting period 2021-06
Issuance ending period 2031-06
Coupon Rate 0.65%
Repayment and Interest Payment Bullet repayment; interest payable annually
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Taiwan [member] | Tranche A [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 6,900.0
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Taiwan [member] | Tranche B [member]  
Bonds payable [line items]  
Domestic unsecured bonds 7,900.0
Domestic Unsecured Bonds Hundred And Ten Three [Member] | Taiwan [member] | Tranche C [member]  
Bonds payable [line items]  
Domestic unsecured bonds $ 4,900.0