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Financial Liabilities Designated At Fair Value Through Profit Or Loss - Summary of financial instruments designated at fair value through profit or loss (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Statement [Line Items]    
Financial liabilities at fair value through profit or loss ¥ 414,106 ¥ 455,734
Borrowings    
Statement [Line Items]    
Financial liabilities at fair value through profit or loss 113,262 72,470
Debt securities in issue    
Statement [Line Items]    
Financial liabilities at fair value through profit or loss ¥ 300,844 ¥ 383,264