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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
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
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 ¥ 0 ¥ 138
Gains (losses) recognized in income on hedged item 0 (92)
Interest rate swap agreements | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative and other 0  
Interest rate swap agreements | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative and other (36) 40
Gains (losses) recognized in income on hedged item (62) (13)
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 5,252 (22,854)
Gains (losses) recognized in income on hedged item (5,217) 22,944
Foreign exchange contracts | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative and other 630  
Foreign exchange contracts | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative and other (2,995) 142
Gains (losses) recognized in income on hedged item ¥ 1,380 ¥ (237)