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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Parenthetical) (Detail) - Fixed Annuity
Sep. 30, 2023
Mar. 31, 2023
Minimum | 0.00% – less than 1.50%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance guaranteed minimum credit rating 0.00% 0.00%
Minimum | 1.50% – less than 2.50%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance guaranteed minimum credit rating 1.50% 1.50%
Minimum | 2.50% or more    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance guaranteed minimum credit rating 2.50% 2.50%
Maximum | 0.00% – less than 1.50%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance guaranteed minimum credit rating 1.50% 1.50%
Maximum | 1.50% – less than 2.50%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance guaranteed minimum credit rating 2.50% 2.50%