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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 | Mar. 31, 2025 | Mar. 31, 2024
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Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 119,093 | ¥ 138,419
50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 7,421 |
150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 127,151 |
0.00% – less than 1.50% |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 111,626 | 131,328
0.00% – less than 1.50% | 50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 7,421 |
0.00% – less than 1.50% | 150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 127,151 |
1.50% or more |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 7,467 | ¥ 7,091
1.50% or more | 50-150bp |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | 0 |
1.50% or more | 150bp and above |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |
Policy holder funds | ¥ 0 |

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