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Pension and Other Employee Benefit Plans (Forecasted Benefit Payments Including Effect of Expected Future Service) (Detail)
¥ in Millions
Mar. 31, 2020
JPY (¥)
Defined Benefit Plan Disclosure [Line Items]  
2021 ¥ 70,325
2022 70,623
2023 71,165
2024 72,469
2025 73,118
2026-2030 ¥ 346,908