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Pension and Severance Plans (Expected Future Benefit Payments) (Detail)
¥ in Millions
Mar. 31, 2020
JPY (¥)
Japan  
Defined Benefit Plan Disclosure [Line Items]  
2021 ¥ 37,384
2022 36,228
2023 36,985
2024 38,271
2025 37,216
2026 - 2030 185,218
Foreign plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 20,825
2022 104,988
2023 12,089
2024 12,269
2025 13,074
2026 - 2030 ¥ 112,218