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Short-Term Borrowings and Long-Term Debt (Contractual Maturities of Long-Term Debt) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]    
2021 ¥ 559,447  
2022 1,430,157  
2023 1,234,962  
2024 697,214  
2025 1,023,243  
2026 and thereafter 5,401,129  
Total ¥ 10,346,152 ¥ 11,529,400