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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | ¥ 1,574,161 | ¥ 1,551,749
Expected future policy benefits and expenses - Undiscounted | 2,614,139 | 2,532,638
Expected future gross premiums - Discounted | 1,330,807 | 1,362,111
Expected future policy benefits and expenses - Discounted | 1,284,016 | 1,511,436
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 2,398,826 | 2,456,942
Expected future policy benefits and expenses - Undiscounted | 2,544,303 | 2,552,133
Expected future gross premiums - Discounted | 1,819,478 | 2,003,392
Expected future policy benefits and expenses - Discounted | 1,380,958 | 1,659,960
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 594,234 | 617,771
Expected future policy benefits and expenses - Undiscounted | 1,309,972 | 1,288,727
Expected future gross premiums - Discounted | 483,039 | 493,328
Expected future policy benefits and expenses - Discounted | ¥ 470,564 | ¥ 442,939

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