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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Balances of Policy Account (Detail) - Fixed Annuity And Annuitization Benefits - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Policyholder Account Balance [Line Items] |  |
Beginning balance | ¥ 158,952 | ¥ 193,322
Transfer in | 10,249 | 17,223
Surrenders and partial surrenders | (71) | (58)
Benefit payments and lump sum payments, etc. | (31,179) | (50,956)
Policy charges | (229) | (262)
Transfer out | (290) | (409)
Interests | 1,023 | 1,209
Others | (36) | (1,117)
Ending balance | ¥ 138,419 | ¥ 158,952
Weighted average guaranteed interest rate (%) | 0.70% | 0.70%
Benefits in excess of policyholder account balances (Millions of yen) | ¥ 1 | ¥ 1
Cash surrender value (Millions of yen) | ¥ 132,411 | ¥ 152,578

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