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Bonds Payable - Major Terms of Domestic Unsecured Bonds (Detail)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Apr. 14, 2022
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Bonds payable [line items]      
Repayment and Interest Payment Bullet repayment; interest payable annually    
Domestic Unsecured Bonds Hundred And One Three [member]      
Bonds payable [line items]      
Issuance starting period   2012-10  
Issuance ending period   2022-10  
Coupon Rate   1.53% 1.53%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And One Three [member] | Taiwan [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,400.0  
Domestic Unsecured Bonds Hundred And One Four [member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2013-01  
Issuance ending period   2020-01  
Coupon Rate   1.35% 1.35%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And One Four [member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2013-01  
Issuance ending period   2023-01  
Coupon Rate   1.49% 1.49%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And One Four [member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 10,000.0  
Domestic Unsecured Bonds Hundred And One Four [member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 3,000.0  
Domestic Unsecured Bonds Hundred And Two One [member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2013-02  
Issuance ending period   2020-02  
Coupon Rate   1.38% 1.38%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Two One [member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2013-02  
Issuance ending period   2023-02  
Coupon Rate   1.50% 1.50%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Two One [member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 11,600.0  
Domestic Unsecured Bonds Hundred And Two One [member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 3,600.0  
Domestic Unsecured Bonds Hundred And Two Two [member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2013-07  
Issuance ending period   2020-07  
Coupon Rate   1.50% 1.50%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Two Two [member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2013-07  
Issuance ending period   2023-07  
Coupon Rate   1.70% 1.70%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Two Two [member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 10,200.0  
Domestic Unsecured Bonds Hundred And Two Two [member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 3,500.0  
Domestic Unsecured Bonds Hundred And Two Four [member] | Tranche D [member]      
Bonds payable [line items]      
Issuance starting period   2013-09  
Issuance ending period   2021-03  
Coupon Rate   1.85% 1.85%
Repayment and Interest Payment   Bullet repayment; interest payable annually (interest for the six months prior to maturity will accrue on the basis of actual days and be repayable at maturity)  
Domestic Unsecured Bonds Hundred And Two Four [member] | Tranche E [member]      
Bonds payable [line items]      
Issuance starting period   2013-09  
Issuance ending period   2023-03  
Coupon Rate   2.05% 2.05%
Repayment and Interest Payment   Bullet repayment; interest payable annually (interest for the six months prior to maturity will accrue on the basis of actual days and be repayable at maturity)  
Domestic Unsecured Bonds Hundred And Two Four [member] | Tranche F [member]      
Bonds payable [line items]      
Issuance starting period   2013-09  
Issuance ending period   2023-09  
Coupon Rate   2.10% 2.10%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Two Four [member] | Taiwan [member] | Tranche D [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 2,600.0  
Domestic Unsecured Bonds Hundred And Two Four [member] | Taiwan [member] | Tranche E [member]      
Bonds payable [line items]      
Domestic unsecured bonds   5,400.0  
Domestic Unsecured Bonds Hundred And Two Four [member] | Taiwan [member] | Tranche F [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 2,600.0  
Domestic Unsecured Bonds Hundred And Nine One [Member]      
Bonds payable [line items]      
Issuance starting period   2020-09  
Issuance ending period   2060-09  
Coupon Rate   2.70% 2.70%
Repayment and Interest Payment   Bullet repayment (callable on the 5th anniversary of the issue date and every anniversary thereafter); interest payable annually  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-03  
Issuance ending period   2025-03  
Coupon Rate   0.58% 0.58%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-03  
Issuance ending period   2027-03  
Coupon Rate   0.62% 0.62%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-03  
Issuance ending period   2030-03  
Coupon Rate   0.64% 0.64%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Taiwan [member]      
Bonds payable [line items]      
Domestic unsecured bonds     $ 1,000.0
Domestic Unsecured Bonds Hundred And Nine One [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 3,000.0  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   10,500.0  
Domestic Unsecured Bonds Hundred And Nine One [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 10,500.0  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-04  
Issuance ending period   2025-04  
Coupon Rate   0.52% 0.52%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-04  
Issuance ending period   2027-04  
Coupon Rate   0.58% 0.58%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-04  
Issuance ending period   2030-04  
Coupon Rate   0.60% 0.60%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 5,900.0  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   10,400.0  
Domestic Unsecured Bonds Hundred And Nine Two [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 5,300.0  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-05  
Issuance ending period   2025-05  
Coupon Rate   0.55% 0.55%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-05  
Issuance ending period   2027-05  
Coupon Rate   0.60% 0.60%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-05  
Issuance ending period   2030-05  
Coupon Rate   0.64% 0.64%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,500.0  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   7,500.0  
Domestic Unsecured Bonds Hundred And Nine Three [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 2,400.0  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-07  
Issuance ending period   2025-07  
Coupon Rate   0.58% 0.58%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-07  
Issuance ending period   2027-07  
Coupon Rate   0.65% 0.65%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-07  
Issuance ending period   2030-07  
Coupon Rate   0.67% 0.67%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 5,700.0  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   6,300.0  
Domestic Unsecured Bonds Hundred And Nine Four [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 1,900.0  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-09  
Issuance ending period   2025-09  
Coupon Rate   0.50% 0.50%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-09  
Issuance ending period   2027-09  
Coupon Rate   0.58% 0.58%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-09  
Issuance ending period   2030-09  
Coupon Rate   0.60% 0.60%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,800.0  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   8,000.0  
Domestic Unsecured Bonds Hundred And Nine Five [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 2,800.0  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2025-12  
Coupon Rate   0.40% 0.40%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2027-12  
Coupon Rate   0.44% 0.44%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2030-12  
Coupon Rate   0.48% 0.48%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 1,600.0  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   5,600.0  
Domestic Unsecured Bonds Hundred And Nine Six [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,800.0  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2025-12  
Coupon Rate   0.36% 0.36%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2027-12  
Coupon Rate   0.41% 0.41%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2020-12  
Issuance ending period   2030-12  
Coupon Rate   0.45% 0.45%
Repayment and Interest Payment   Two equal installments in last two years; interest payable annually  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 1,900.0  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   10,200.0  
Domestic Unsecured Bonds Hundred And Nine Seven [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 6,400.0  
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% 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% 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% 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% 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% 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% 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% 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% 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% 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  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2021-08  
Issuance ending period   2025-08  
Coupon Rate   0.485% 0.485%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2021-08  
Issuance ending period   2026-08  
Coupon Rate   0.50% 0.50%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2021-08  
Issuance ending period   2028-08  
Coupon Rate   0.55% 0.55%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Tranche D [member]      
Bonds payable [line items]      
Issuance starting period   2021-08  
Issuance ending period   2031-08  
Coupon Rate   0.62% 0.62%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,000.0  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   8,000.0  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   5,400.0  
Domestic Unsecured Bonds Hundred And Ten Four [Member] | Taiwan [member] | Tranche D [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 4,200.0  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2021-10  
Issuance ending period   2026-04  
Coupon Rate   0.535% 0.535%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2021-10  
Issuance ending period   2026-10  
Coupon Rate   0.54% 0.54%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2021-10  
Issuance ending period   2028-10  
Coupon Rate   0.60% 0.60%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Tranche D [member]      
Bonds payable [line items]      
Issuance starting period   2021-10  
Issuance ending period   2031-10  
Coupon Rate   0.62% 0.62%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 3,200.0  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   6,900.0  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   4,600.0  
Domestic Unsecured Bonds Hundred And Ten Six [Member] | Taiwan [member] | Tranche D [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 1,600.0  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Tranche A [member]      
Bonds payable [line items]      
Issuance starting period   2021-12  
Issuance ending period   2026-12  
Coupon Rate   0.65% 0.65%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Tranche B [member]      
Bonds payable [line items]      
Issuance starting period   2021-12  
Issuance ending period   2027-06  
Coupon Rate   0.675% 0.675%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Tranche C [member]      
Bonds payable [line items]      
Issuance starting period   2021-12  
Issuance ending period   2028-12  
Coupon Rate   0.72% 0.72%
Repayment and Interest Payment   Bullet repayment; interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Taiwan [member] | Tranche A [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 7,700.0  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Taiwan [member] | Tranche B [member]      
Bonds payable [line items]      
Domestic unsecured bonds   3,500.0  
Domestic Unsecured Bonds Hundred And Ten Seven [Member] | Taiwan [member] | Tranche C [member]      
Bonds payable [line items]      
Domestic unsecured bonds   $ 5,500.0  
Domestic Unsecured Bonds Hundred And Ten Five [Member]      
Bonds payable [line items]      
Issuance starting period   2021-09  
Issuance ending period   2051-09  
Coupon Rate   3.10% 3.10%
Repayment and Interest Payment   Bullet repayment (callable on the 5th anniversary of the issue date and every anniversary thereafter); interest payable annually  
Domestic Unsecured Bonds Hundred And Ten Five [Member] | Taiwan [member]      
Bonds payable [line items]      
Domestic unsecured bonds     $ 1,000.0