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Long-Duration Insurance Contracts Relating to Life Insurance Operations - Schedule of Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2024	Mar. 31, 2023
Yen-denominated insurance (First Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Expected future gross premiums - Undiscounted	¥ 1,525,071	¥ 1,538,107
Expected future policy benefits and expenses - Undiscounted	2,378,836	2,291,205
Expected future gross premiums - Discounted	1,395,370	1,429,503
Expected future policy benefits and expenses - Discounted	1,565,877	1,571,886
Yen-denominated insurance (Third Sector)
Liability for Future Policy Benefit, Activity [Line Items]
Expected future gross premiums - Undiscounted	2,590,963	2,695,239
Expected future policy benefits and expenses - Undiscounted	2,583,535	2,578,630
Expected future gross premiums - Discounted	2,242,701	2,388,386
Expected future policy benefits and expenses - Discounted	1,844,599	1,918,462
Foreign currency denominated insurance
Liability for Future Policy Benefit, Activity [Line Items]
Expected future gross premiums - Undiscounted	685,134	626,411
Expected future policy benefits and expenses - Undiscounted	1,300,018	1,097,567
Expected future gross premiums - Discounted	535,943	492,588
Expected future policy benefits and expenses - Discounted	¥ 447,081	¥ 387,073

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Liability for future policy benefit expected future policy benefit discounted before reinsurance.

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-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E

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- Definition

Amount, before effect of reinsurance, of discounted balance for expected future gross premium component of liability for future policy benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-6

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Amount, before effect of reinsurance, of undiscounted balance for expected future gross premium component of liability for future policy benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E

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-Topic 944
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-6

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Amount, before effect of reinsurance, of undiscounted balance for expected future policy benefit and expense component of liability for future policy benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E

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-Topic 944
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-URI https://asc.fasb.org//1943274/2147480081/944-40-50-6

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