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Pension and Other Employee Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) Before-Tax) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial gain (loss) ¥ (169,963) ¥ (21,300)
Amortization of net actuarial loss (gain) (5,873) (7,886)
Prior service benefits (cost) (2,734) (109)
Amortization of prior service cost (benefits) 121 152
Total recognized in other comprehensive income (loss) before-tax ¥ (178,449) ¥ (29,143)