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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 | Mar. 31, 2025 | Mar. 31, 2024
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | ¥ 1,551,749 | ¥ 1,525,071
Expected future policy benefits and expenses - Undiscounted | 2,532,638 | 2,378,836
Expected future gross premiums - Discounted | 1,362,111 | 1,395,370
Expected future policy benefits and expenses - Discounted | 1,511,436 | 1,565,877
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 2,456,942 | 2,590,963
Expected future policy benefits and expenses - Undiscounted | 2,552,133 | 2,583,535
Expected future gross premiums - Discounted | 2,003,392 | 2,242,701
Expected future policy benefits and expenses - Discounted | 1,659,960 | 1,844,599
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 617,771 | 685,134
Expected future policy benefits and expenses - Undiscounted | 1,288,727 | 1,300,018
Expected future gross premiums - Discounted | 493,328 | 535,943
Expected future policy benefits and expenses - Discounted | ¥ 442,939 | ¥ 447,081

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