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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Hedges of net investment in foreign operations) (Detail) - Hedges of net investment in foreign operations - Derivatives designated as hedging instruments - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Borrowings and bonds in foreign currencies
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other comprehensive income on derivative and others	¥ (13,601)	¥ (97,221)	¥ (66,947)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in other comprehensive income on derivative and others	1,488	(41,341)	(21,316)
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Borrowings and bonds in foreign currencies
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income	0	0	0
Gains on sales of subsidiaries and equity method investments and liquidation losses, net | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income	(15,995)	(87)	(7,874)
Interest expense | Borrowings and bonds in foreign currencies
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income	0	0	0
Interest expense | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income	¥ 10,597	¥ 14,865	7,051
Other (income) and expense | Borrowings and bonds in foreign currencies
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income			0
Other (income) and expense | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from other comprehensive income (loss) into income			¥ (252)

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- Definition

Gains (losses) recognized in other comprehensive income on derivative and others.

+ References

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- Definition

Other Comprehensive Income Loss Cash Flow Hedges Gain Loss Before Reclassification And Tax.

+ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

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