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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, 2025	Mar. 31, 2024	Mar. 31, 2023
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets		¥ 629	¥ 134	¥ 243
Property, Plant and Equipment, Other Types
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs of long-lived assets	[1]	598	¥ 134	¥ 241
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		¥ 20,030
[1] For the “Others”, the numbers of properties are omitted. Write-downs of long-lived assets for fiscal 2025 include write-downs of property under facility operations held by certain subsidiaries, of which ¥20,030 million related to write-downs of two coal-biomass co-fired power plants.

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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.

+ References

No definition available.

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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
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-Topic 230
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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-Publisher FASB
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