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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 | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Policyholder Account Balance [Line Items] |  |
Beginning balance | ¥ 163,734 | ¥ 198,905
Effect of changes other than through net income and other comprehensive income | (26,997) | (28,754)
Surrenders and withdrawals | (7,641) | (4,083)
Transfer in | (7,891) | (14,093)
Benefit payments | (11,434) | (10,762)
Others | (31) | 184
Changes through net income | 30,205 | (6,343)
Effect of changes in fair value of corresponding investment assets | 40,846 | (2,347)
Fee income | (3,750) | (3,938)
Effect of changes in fair value of market risk benefits | (6,891) | (58)
Changes through other comprehensive income | 265 | (74)
Effect of changes in the instrument-specific credit risk | 265 | (74)
Ending balance | 167,207 | 163,734
Policyholder account balances | 167,496 | 157,399
Market risk benefits | (289) | 6,335
Total | ¥ 167,207 | ¥ 163,734

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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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