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Commitments, Contingent Liabilities and Other (Schedule of Aggregate Amounts of Year-by-Year Payment of Purchase Commitments) (Detail)
¥ in Millions
Mar. 31, 2020
JPY (¥)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]  
2021 ¥ 378,319
2022 103,033
2023 76,541
2024 49,549
2025 36,936
Later fiscal years 40,533
Total ¥ 684,911