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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, 2023 | 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 | ¥ 1,522,501 | ¥ 1,538,107
Expected future policy benefits and expenses - Undiscounted | 2,316,478 | 2,291,205
Expected future gross premiums - Discounted | 1,389,250 | 1,429,503
Expected future policy benefits and expenses - Discounted | 1,525,033 | 1,571,887
Yen-denominated insurance (Third Sector) |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 2,649,324 | 2,695,239
Expected future policy benefits and expenses - Undiscounted | 2,582,806 | 2,578,630
Expected future gross premiums - Discounted | 2,287,047 | 2,388,386
Expected future policy benefits and expenses - Discounted | 1,839,144 | 1,918,462
Foreign currency denominated insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums - Undiscounted | 687,445 | 626,411
Expected future policy benefits and expenses - Undiscounted | 1,262,953 | 1,097,567
Expected future gross premiums - Discounted | 519,357 | 492,588
Expected future policy benefits and expenses - Discounted | ¥ 396,985 | ¥ 387,073

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