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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 (Parenthetical) (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets		¥ 243	¥ 12,749	¥ 1,067
Property, Plant and Equipment, Other Types
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets	[1]	¥ 241	11,878	0
Property, Plant and Equipment, Other Types | Hotel
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets				¥ 1,099
Property, Plant and Equipment, Other Types | Property under Facility Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets			31,205
Property, Plant and Equipment, Other Types | Coal-biomass co-fired power plants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets			19,564
Property, Plant and Equipment, Other Types | Aircraft
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets			¥ 2,331
[1] For the “Others”, the numbers of properties are omitted. Write-downs of long-lived assets for fiscal 2021 include write-downs of ¥1,099 million of hotels. Write-downs of long-lived assets for fiscal 2022 include write-downs of ¥31,205 million of property under facility operations and others held by subsidiaries, of which ¥19,564 million related to write-downs of two coal-biomass co-fired power plants, and ¥2,331 million of two aircraft.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2611-110228

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