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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) | Sep. 30, 2023 | Mar. 31, 2023
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted average of the original discount rates | 1.60% | 1.60%
Weighted average of the current discount rates | 2.10% | 1.90%
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 | 2.00% | 1.80%
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted average of the original discount rates | 3.00% | 2.90%
Weighted average of the current discount rates | 6.00% | 5.20%

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