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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, 2024 | Mar. 31, 2023
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Yen-denominated insurance (First Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | ¥ 1,525,071 | ¥ 1,538,107
Expected future policy benefits and expenses - Undiscounted | 2,378,836 | 2,291,205
Expected future gross premiums - Discounted | 1,395,370 | 1,429,503
Expected future policy benefits and expenses - Discounted | 1,565,877 | 1,571,886
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 2,590,963 | 2,695,239
Expected future policy benefits and expenses - Undiscounted | 2,583,535 | 2,578,630
Expected future gross premiums - Discounted | 2,242,701 | 2,388,386
Expected future policy benefits and expenses - Discounted | 1,844,599 | 1,918,462
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 685,134 | 626,411
Expected future policy benefits and expenses - Undiscounted | 1,300,018 | 1,097,567
Expected future gross premiums - Discounted | 535,943 | 492,588
Expected future policy benefits and expenses - Discounted | ¥ 447,081 | ¥ 387,073

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