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Fair value measurements - Impact of changes in its own creditworthiness on certain financial liabilities (Detail) - JPY (¥) ¥ in Billions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Changes recognized as a credit to other comprehensive income	¥ 35	¥ 1	¥ 63	¥ 6
Credit (debit) amounts reclassified to earnings	¥ 0	¥ 0	0	1
Cumulative credit (debit) balance recognized in accumulated other comprehensive income			¥ 116	¥ (5)

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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