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v3.25.3

Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Policy Account Balance And Market Risk Benefits (Detail) - Variable Annuity And Variable Life Insurance - JPY (¥) ¥ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Policyholder Account Balance [Line Items] |  |
Beginning balance | ¥ 136,257 | ¥ 167,207
Effect of changes other than through net income and other comprehensive income | (10,571) | (23,706)
Surrenders and withdrawals | (2,366) | (4,924)
Transfer in | (3,163) | (6,902)
Benefit payments | (4,957) | (11,851)
Others | (85) | (29)
Changes through net income | 17,278 | (7,292)
Effect of changes in fair value of corresponding investment assets | 21,719 | (3,538)
Fee income | (1,636) | (3,590)
Effect of changes in fair value of market risk benefits | (2,805) | (164)
Changes through other comprehensive income | (264) | 48
Effect of changes in the instrument-specific credit risk | (264) | 48
Ending balance | 142,700 | 136,257
Policy account balances | 146,174 | 136,662
Market risk benefits | (3,474) | (405)
Total | ¥ 142,700 | ¥ 136,257

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480112/944-40-45-3 + Details
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