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Pension Plans (Benefits Expected to be Paid) (Detail)
¥ in Millions
Mar. 31, 2020
JPY (¥)
Japan  
Defined Benefit Plan Disclosure [Line Items]  
2021 ¥ 3,057
2022 2,910
2023 3,037
2024 3,263
2025 3,434
2026-2030 19,887
Total 35,588
Overseas plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,483
2022 1,541
2023 1,558
2024 1,685
2025 1,748
2026-2030 10,846
Total ¥ 18,861