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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Fair value hedges) (Detail) - Derivatives designated as hedging instruments - Fair value hedges - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Interest rate swap agreements | Life insurance premiums and related investment income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	¥ 2,633	¥ 4,142	¥ 9,533
Gains (losses) recognized in income on hedged item	(2,499)	(4,068)	(8,990)
Interest rate swap agreements | Other (income) and expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	0	0	0
Gains (losses) recognized in income on hedged item	0	0	0
Foreign exchange contracts | Life insurance premiums and related investment income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	(42,947)	(37,997)	(5,032)
Gains (losses) recognized in income on hedged item	43,006	37,659	3,591
Foreign exchange contracts | Other (income) and expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	(412)	5	438
Gains (losses) recognized in income on hedged item	¥ 332	¥ 89	¥ (356)

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