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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Gross Premiums And Interest Expense (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | ¥ 456,924 | ¥ 448,676 | ¥ 427,347
Liability for Future Policy Benefit, Interest Expense | 28,105 | 24,971 | 21,503
Yen-denominated insurance (First Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 168,805 | 162,667 | 158,477
Liability for Future Policy Benefit, Interest Expense | 13,142 | 12,309 | 11,376
Yen-denominated insurance (Third Sector) |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 205,787 | 208,640 | 207,553
Liability for Future Policy Benefit, Interest Expense | 9,720 | 9,077 | 8,265
Foreign currency denominated insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Liability for Future Policy Benefit, Gross Premium Income | 82,332 | 77,369 | 61,317
Liability for Future Policy Benefit, Interest Expense | ¥ 5,243 | ¥ 3,585 | ¥ 1,862

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