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Write-Downs of Long-Lived Assets - Breakdowns of Recognized Impairment Losses for Difference between Carrying Amounts and Fair Values Reflected as Write-Downs of Long-Lived Assets (Detail) ¥ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2023 JPY (¥) Property	Sep. 30, 2022 JPY (¥) Property	Sep. 30, 2023 JPY (¥) Property	Sep. 30, 2022 JPY (¥) Property
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of the assets held for sale, amount		¥ 8	¥ 0	¥ 8	¥ 56
Write-downs of the assets held for sale, number of properties | Property		0
Write-downs due to decline in estimated future cash flows, amount		¥ 444	145	¥ 530	¥ 197
Write-downs due to decline in estimated future cash flows, number of properties | Property		0
Commercial facilities other than office buildings
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs due to decline in estimated future cash flows, amount		¥ 365	¥ 51	¥ 439	¥ 51
Write-downs due to decline in estimated future cash flows, number of properties | Property		1	2	2	2
Condominiums
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of the assets held for sale, amount				¥ 0	¥ 0
Write-downs of the assets held for sale, number of properties | Property				1	0
Write-downs due to decline in estimated future cash flows, amount		¥ 1	¥ 0	¥ 1	¥ 3
Write-downs due to decline in estimated future cash flows, number of properties | Property		1	0	1	3
Others
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of the assets held for sale, amount	[1]	¥ 8	¥ 0	¥ 8	¥ 56
Write-downs due to decline in estimated future cash flows, amount	[1]	¥ 78	¥ 94	¥ 90	¥ 143
Write-downs due to decline in estimated future cash flows, number of properties | Property	[1]	0
[1] For “Others,” the number of properties is omitted.

X

- Definition

Impairment of long lived assets to be disposed of due to decline in estimated future cash flows.

+ References

No definition available.

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- Definition

Number Of Impaired Assets Impairment Due To Assets Held For Sale.

+ References

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- Definition

Number of impaired assets impairment due to decline in estimated future cash flows.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-15

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