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Bonds Payable - Major Terms of Overseas Unsecured Bonds (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Overseas [member] | Issuance period one [Member]  
Bonds payable [line items]  
Overseas unsecured bonds $ 1,000.0
Overseas [member] | Issuance period two [Member]  
Bonds payable [line items]  
Overseas unsecured bonds 750.0
Overseas [member] | Issuance period three [Member]  
Bonds payable [line items]  
Overseas unsecured bonds 1,250.0
Overseas [member] | Issuance Period Four [Member]  
Bonds payable [line items]  
Overseas unsecured bonds 1,100.0
Overseas [member] | Issuance Period Five [Member]  
Bonds payable [line items]  
Overseas unsecured bonds 900.0
Overseas [member] | Issuance Period Six [Member]  
Bonds payable [line items]  
Overseas unsecured bonds $ 1,500.0
Overseas unsecured bonds [member] | Issuance period one [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2025-09
Coupon Rate 0.75%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance period two [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2027-09
Coupon Rate 1.00%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance period three [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2030-09
Coupon Rate 1.375%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance Period Four [Member]  
Bonds payable [line items]  
Issuance starting period 2021-04
Issuance ending period 2026-04
Coupon Rate 1.25%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance Period Five [Member]  
Bonds payable [line items]  
Issuance starting period 2021-04
Issuance ending period 2028-04
Coupon Rate 1.75%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance Period Six [Member]  
Bonds payable [line items]  
Issuance starting period 2021-04
Issuance ending period 2031-04
Coupon Rate 2.25%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually