Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Minimum Guaranteed Interest Rates (Parenthetical) (Detail) - Fixed Annuity |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Minimum | 0.00% – less than 1.50% | ||
| Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] | ||
| Policyholder account balance guaranteed minimum credit rating | 0.00% | 0.00% |
| Minimum | 1.50% or more | ||
| Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] | ||
| Policyholder account balance guaranteed minimum credit rating | 1.50% | 1.50% |
| Maximum | 0.00% – less than 1.50% | ||
| Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] | ||
| Policyholder account balance guaranteed minimum credit rating | 1.50% | 1.50% |