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Commitments, contingencies and guarantees - Maturities of purchase obligations (Detail) - Other commitments [Member]
¥ in Millions
Mar. 31, 2020
JPY (¥)
Purchase obligations [Line Items]  
Purchase obligations, Total ¥ 126,949
Less than 1 year 20,523
1 to 2 years 24,206
2 to 3 years 11,514
3 to 4 years 8,280
4 to 5 years 112
More than 5 years ¥ 62,314