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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, 2022
Mar. 31, 2021
Fair Value Disclosures [Abstract]    
Changes recognized as a credit (debit) to other comprehensive income ¥ 60 ¥ (88)
Credit (debit) amounts reclassified to earnings 1 (10)
Cumulative credit (debit) balance recognized in accumulated other comprehensive income ¥ 49 ¥ (11)