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Corporate Bonds Issuance - Additional Information (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2022
Dec. 31, 2021
Apr. 09, 2021
Disclosure of corporate bond liabilities [line items]      
Corporate bond face value     $ 2,413,000,000
Corporate bond fixed rate   6.643%  
Class E non-subordinated corporate bonds [Member]      
Disclosure of corporate bond liabilities [line items]      
Corporate bond fixed rate 0.00%    
Class E non-subordinated corporate bonds [Member] | Minimum Average Term [member]      
Disclosure of corporate bond liabilities [line items]      
Original value $ 15,000,000,000    
Class E non-subordinated corporate bonds [Member] | Maximum Average Term [member]      
Disclosure of corporate bond liabilities [line items]      
Original value $ 20,000,000,000