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Fair value measurements - Impact of changes in its own creditworthiness on certain financial liabilities (Detail) - JPY (¥) ¥ in Billions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Changes recognized as a credit (debit) to other comprehensive income	¥ 49	¥ 25
Credit (debit) amounts reclassified to earnings	(1)	(1)
Cumulative credit (debit) balance recognized in accumulated other comprehensive income	¥ 80	¥ 32

Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for unrealized gain (loss) from increase (decrease) in instrument-specific credit risk, realized upon derecognition of financial liability measured under fair value option.

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