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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Detail) - Fixed Annuity - JPY (¥) ¥ in Millions | Sep. 30, 2023 | Mar. 31, 2023
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Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 149,544 | ¥ 158,952
0.00% – less than 1.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 142,567 | 152,259
1.50% – less than 2.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 6,977 | 6,644
2.50% or more |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 0 | ¥ 49

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