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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit, Weighted Average Discount Rates (Detail)
Mar. 31, 2025
Mar. 31, 2024
Yen-denominated insurance (First Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted average of the original discount rates 1.80% 1.70%
Weighted average of the current discount rates 2.70% 2.10%
Yen-denominated insurance (Third Sector)    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted average of the original discount rates 1.70% 1.70%
Weighted average of the current discount rates 2.70% 2.10%
Foreign currency denominated insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted average of the original discount rates 3.30% 3.10%
Weighted average of the current discount rates 5.90% 5.50%