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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Derivatives not designated as hedging instruments) (Detail) - Nondesignated - 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 ¥ 0 ¥ 0
Interest rate swap agreements | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Interest rate swap agreements | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 33 8
Futures | Life insurance premiums and related investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative (1,106) (141)
Futures | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Futures | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 2,513 1,259
Foreign exchange contracts | Life insurance premiums and related investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative (3,070) 6,698
Foreign exchange contracts | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative (2,436) (10,630)
Foreign exchange contracts | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative (11,733) 44,741
Credit derivatives held/written | Life insurance premiums and related investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Credit derivatives held/written | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Credit derivatives held/written | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative (2) 0
Options held/written and other | Life insurance premiums and related investment income    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Options held/written and other | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative 0 0
Options held/written and other | Other (income) and expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) recognized in income on derivative ¥ 95 ¥ (522)