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Pension and Severance Plans (Expected Future Benefit Payments) (Detail)
¥ in Millions
Mar. 31, 2018
JPY (¥)
Japan  
Defined Benefit Plan Disclosure [Line Items]  
2019 ¥ 39,918
2020 40,328
2021 41,233
2022 42,609
2023 43,772
2024 - 2028 232,325
Foreign plans  
Defined Benefit Plan Disclosure [Line Items]  
2019 14,889
2020 15,039
2021 16,133
2022 16,689
2023 17,830
2024 - 2028 ¥ 102,045